f BERKELEY

LIBRARY

1 UNIVERSITY OF Vc*UK>RNIA

EARTH

SCIENCES

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UNIVERSITY OF CALIFORNIA.

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Received &-; , i8g / .

Accessions No. ^4t f^-^Shelf No.

LIBBAKY CATALOGUE SLIPS.

Illinois. (Geological Survey-)

Geological Survey of Illinois, A. H. Worthen Director. Volume VIII. Geology jj and Palaeontology. Edited by Josua Lindahl, Ph. D., State Geologist.— Geology by A. H. Worthen. Palaeontology by A. H. Worthen, Charles Waohsmuth, Frank 8 Springer, E. O. Ulrich and Oliver Everett.— With an Appendix (Biography, Bib- £ liography, and General Index to Volumes I-VIID— TJ?.XT.— Published by authority of the Legislature of Illinois, July, 1890. 8vo. xiii+758+151 pp., 1 portrait, 1 map.— (Plates bound in a separate volume.)

Worthen, (Amos H.)

Geological Survey of Illinois, A. H. Worthen, Director. Volume VIII. Geology £ and Palaeontology. Edited by Josua Lindahl, Ph. D., State Geologist.— Geology by A. H. Worthen. Palaeontology by A. H. Worthen, Charles Wachsmuth, Frank Springer, E. O. Ulrich and Oliver Everett. With an Appendix (Biography, Bib- 2 liography, and General Index to Volumes I-VIII.)— !TJ57.XT.— Published by authority of the Legislature of Illinois, 1890. 8vo. xiii+758+151 pp., 1 portrait, 1 map.— (Plates bound in a separate volume.)

i^ Geology and Palaeontology. v

Geological Survey of Illinois, A. H. Worthen, Director. Volume VIII. Geology

.g and Palaeontology. Edited by Josua Lindahl, Ph. D., State Geologist— Geology by

•J-, A. H. Worthen. Paleontology by A. H. Worthen, Charles Wachsmuth, Frank

§ Springer, E. O. Ulrich and Oliver Everett.— With an Appendix (Biography, Bib-

jS liography, and General Index to Volumes I.-VIII.)— T.RJT.— Published by authority

£ of the Legislature of Illinois, 1890.

K 8vo. xii+758+151 pp., 1 portrait, 1 map.— (Plates bound in a separate volume.)

GEOLOGICAL SURVEY OF ILLINOIS

A. H. WORTHEN, DIRECTOR.

VOLUME VIII.

Edited by JOSUA LINDAHL, Ph. D., State Geologist,

PLATES.

PUBLISHED

BY AUTHORITY OF THE LEGISLATURE OF ILLINOIS. JULY, 1890.

X*A

V

EARTH

SCIENCES LIBRARY

ILLUSTRATED

BY E. O. ULRICH, NEWPORT, KENTUCKY.

PBINTED

BY H. W. ROKKER, SPBINOFIBLD, ILLINOIS.

PLATE I.

The specimens figured on this plate are now in the Illinois State Museum. They •were collected by Dr. Oliver Everett from the Trenton limestone near Dixon, 111.

PARE.

Fig. 1. ANTHASPIDELLA MAMMULATA U. & E 258

1. View of cup, showing the distributi in ol thu oscuh, their elevated mar- gins, and the dense external laye •, worn away at the margin. Natural size. 1 a. Transverse section showing the thickness of the sponge and the vertical

arrangement of the canals. Natural size. 1 b. Vertical section showing several canals and the direction of the spiculfi

columns.

1 c. Portion of 1 lj, x!8. 1 d. Central portion of 1 a, xlS, showing the arrangement of the spicules.

Fig. 2. ANTHASPIDELLA FLOKIFERA U. & E. (See also PI. IV.) 25!>

View of upper surface of a medium sized specimen, showing arrange- ment of oscula and canals. Natural size.

Fig. 3. ANTHASPIDELLA PABVISTELLATA U. & E lim

Upper surface of the i ype specimen, natural size. The radial uiinals have been worn or ground away so that the mouths of the radial canals are exposed.

sof uita.

Hi

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vvorthen dirext

UHIVBRSIT7

PLATE II.

Excepting fig. 4o, all the specimens figured on this plate are now in the Illinois State Museum. They were collected by Dr. Oliver Everett from the Trenton limestone. near Dixon, 111.

PAGE.

Fig. 1. ANTHASPIDELLA FENESTBATA U. & E 264

Lateral view of the type specimen, showing the oblique cup, and the arrangement of the oscula and canals.

Fig. 2. ANTHASPIDELLA GBANDIS U. & E 262

2. Part of a fragment of a large specimen showing the arrangement of the

canalf and the widely separated oscula on the upper surface, natural size.

2 a. A small portion of the lower surface showing the irregular eha acter of

the canals on this side. Natural size.

Fig. 3. ANTHASPIDELLA FLRMA U. & E 263

3. Side view of a specimen, natural size.

3 a. View of upper surface of same, showing the arrangement of the oscula

and canals. Natural size.

Fig. 4. HlNDIA IN.W3UALI8 U. & E 275

4. Vertical section of large specimen showing the radiate cljimu'U'r uf the

spicular me-h. Natural size.

4 a. Transverse section of same, x25, showing the spicules and the unequal

size of the radiate canals. 4 b. Shows the appearance of the skeleton in vertical sections, xiV

Fig. 4c. HYALOSTELIA SOLIVAGA Ulrich 232

A large Hexactinellid spicule constantly found associated with Hindia sphceroidalis Duncan, in the Niagara deposits of Kentucky, Tennesse, Indiana and Minnesota. The specimen figured is from the last locality, and belongs to the collection of Mr. E. O. Ulrich.

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PLATE III.

PAGE.

Fig. 1. ANTHASPIDELLA SOUTULA U. & E i61

1. View of half the upper surface of the best specimen seen. Natural size.

1 a. About one-fourth of the lower surface of same.

Trenton limestone, Dixon, III. Illinois State Museum. Fig. 2. BELEMNOSPONGIA FASCICULAKIS Ulrica 2

2. A nearly flat subcircular specimen. Natural size.

2 a. Edge of same enlaiged showing moulds of bundles of spieules x!2.

2 b. One of the bundles of spieules as they appear on the upper surface. x!2. Burlington, Iowa. Mr. Charles Wachsmuth's collection.

VOL.VIII

PL. Ill

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PLATE IV.

The specimens figured on this plate are now in the Illinois State Museum. They were collected by Dr. Oliver Everett from the Trenton limestone near Dixon, III.

PAGE

Fig. 1. ANTHASPIDELLA OBLIQUA, U. & E 265

1 . Lateral view of an abraded specimen. Natural size.

1 a. View of upper surface of same showing tho arrangement of the canals and oscula.

Fig. 2 ANTHASPIDELLA FLOBIPEBA, U. & E £9

Median vertical section of the specimen figured on PI. I, showing the vertii-al tubes of the central osculum, and ihe arrangement of the radial canals aud the capillary tubuli.

Fig. 3. ZITTELELLA LOBATA, U. & E 270

8. View of upper surface of a small specimen. Natural size. 3 a. The lower surface of a larger specimen showing the lobate character of the species. Natural size.

3 ft and Sc. Small portions of transverse and vertical sections to show spi-

cular structure, x25. Fig. 4. STBEPTOSOLEN OBCONICUS U. & E 274

4 and 4a. Two vi"ws of a specimen natural size, showing the irregular in-

tertwining o! the canals.

4 1). Median vertical section of the same specimen, showing the cloacal tubes and the irregular canals.

VOL VIM.

PL IV.

E.O.U .&C ^ .

A.H.Worthen dtrext

-oe Litl-iCo. H-.:.>i:iri; Fub.Cln.O.

PLATE V.

The specimens figured on this plate are now in the Illinois State Museum. They were collected by Dr. Oliver Everett from the Trenton limestone near Dixon.IIl.

PAGE Fig. 1. CALATHIUM? LNFELIX U. & E 274

1 and la. Two views of a worn specimen of this species. Natural size.

Pig. 2. ZITTELELLA TYPICALIS var. SUBROTUNDA U. & E 269

2 and 2a. Two views of a specimen showing the usual form of this variety.

Natural size.

Fig. 3 and 5. ZITTELELLA TYPICALIS U. & E 268

3, Median vertical section, showing the cloacal tubes and the arrangement of the radiating canals and capillary tubuli. Natural size.

3 a. Portion of a thin vertical section, x!8, 3 b. Portion of a transverse section, x!8.

3 o. Transverse section of cloaca! tubes, x 12.

5 and 5 a. Two views of the best specimen seen. Natural size.

Fig. 4. ZITTELELLA TY PIC ALIS var. PISTILLIFOKMIS U. & E 26!t

Lateral view of a specimen of this variety, larger than usual. Natural size.

Fig. 6. ZITTELELLA INOSCULATA U. & E 271

6. Polished upper surface of a large specimen. Natural size.

6 a. Lateral view of another example. Natural size.

Fig. 7. ZITTELELLA TYPICALIS var. TUKBINATA U. & E •_'«>

and 7 a. Two views of a specimen of this variety. Natural size.

VOL VIII

HjLOHLfiAii £JiE_liy-2iJr

PL V

PLATE VI.

PAGE

Fig. 1. EDRIOSPONGIA BAS ALIS U, & E.. and ANTHASPIDELLA, sp 272

1. Upper surface of specimen showing the osculiferous face of the Antltax-

pideUa, and to the right portions of the Edrlospongia. Natural sine. 1 a. Lateral view of same, showing the rough base of the Xdriotfonoia,

its irregular sides, and above, the close union it forms with the Anthnn-

pidella. 1 b. Portion of a smaller specimen of E. basalts with the upper surface

ground away and polished to show the arrangement of the canals.

Natural size.

1 c. Thin transverse section showing the spicular skeleton, x!8.

Trenton limestone, Dixon, 111. Illinois State Musoum.

Fig. 2. B ATOSPONGIA 8PICATA CIrich 246

2. View of the lower side from which the dermal layer has bom withered

away. Natural size.

2 a. A bunch of spicules of same, freed from the matrix by mean* of m-id,

x 18.

2 b. The inner side of the basal or dermal layer, x 18.

Lower Coal Measures, Seville, 111. Illinois State Museum.

Fig. rSTBIOSPONGIA CABBONAEIA Ulrich 245

3. A number of the needle-shaped and one four-rayed spicule, x ir>.

3 a. A free four-rayed ?picule found associated with the single forms, x 25.

Lower Coal Measures, Seville, III. Illinois State Museum.

J 0 L VIII

PL VI.

E.O.U.fl<C.S del et iilh.

A.H.Worthen airext

Tha KVcbs Lith.r^.C-r:

PLATE VII.

PAGE.

Fig. 1. CAMAKOCI/ADIA DICHOTOMA U. & E 281

1. A group of sterns of the ordinary appearance and size.

1 a. Vertical section of a specimen preserving the walls, x9. The walls are

changed to crystalline calcite, and show no structure.

1 b. Transverse section of another example, x9, showing minute three- rayed spicules in the chambers.

Figs. 2, 2 a and 2 b. An undetermined fossil from the Dixon sponge layer. Possibly a Stromatoporoid. Not described. The specimens are in the Illinois State Museum.

Fig. 3. ACTINOSTROMA? TKENTONENSE U. & E 282

3. View of the lower side of a specimen. Natural size.

3 a and 3 b. Vertical and transverse sections, x!8, showing a close agreement

in minute structure with the Anthaspidellidce. Trenton limestone, Dixon, 111. Illinois State Musoum.

Fie. \. SYRINGELASMA WOKTHENI Ulrich* 250

4. View of the only fragment seen. Natural size. Both sides of the speci-

men aie practically alike.

4 a. Enlargement of 4 c, being a section through the center of the expan-

sion, and parallel with the surface, x!8.

4 '». Transverse section, x!8, showing the irregular spicular mesh. 4 d. The fractured edge of fig. 4, showing thickness of same, the vertical

canals, and the horizontal channels. Natural size.

4 e. Vertical section, natural size, showine direction of minu'e canals.

Hamilton group, Thunder Bay, Mich. Prof. A. H. Worthen's collection.

Fig. 5. ACTIXOSTKOMA, sp. undet 221

5. The polished edge of a specimen, natural size.

5 a. Transverse section of same, x!8. showing the radial pillars.

5 b. Vertical section of same, showing the radial pillars and the horizontal arrangement of the rays. These figures are introduced for comparison with the Anthaspidellidce.

'Just after the text for the sponges had gone through the press, it was noticed that Syringophyllum had been preoccupied by Edwards and Haime, for a genus of corals. Syrinyelasma is proposed instead.

E.O.U is.;1 S iel et iith.

A.H.Worthen dirext

The Krebe L,1

PLATE VIII.

The specimens figured on this plate are now in the Illinois State Museum. They were collected by Dr. Oliver Everett from the Trenton limestone, near Dixon. 111.

PAGE.

Fig. 1. STBOTOSPONGIA MACULOSA U. & E 277

1 and 1 a. Two views of the type specimen. Natural size. On the first the

dark lines represent the sponge tissue, while in 1 a, the dark spots

represent the mouths of canals. 1 b. The same specimen sawed vertically through the center to show the

intertwining canals and sponge tissue. The latter is represented by

dark lines. 1 c. Thin section, x9, showing relative thickness.

1 d. Portion of 1 c, x!8, giving an obscure idea of the form and nature of

the spicules. The spicular skeleton is clearly very much like that of Dystavtospongia.

Fig. 2. ANTHASPIDELLA MAGNIFICA U. & E 265

2. Basal portion of specimen with the remainder drawn in outline. Natural

size.

2 a. Portion of the inner face of cup to show arrangement of canals and

oscula. Natural size, 2 b. Portion of upper margin (outer side).

2 c. Vertical section of same, showing canals, and thickness of sponge wall.

Natural size.

Fig. 3. DYSTACTOSPONGIA MINOB U & E 278

3. A specimen of the natural size.

3 a. Transverse section, x9.

3 b. Vortical section, x9. Compare portions of this figure with 1 d.

Fig. 4. DYSTACTOSPONGIA BUDIS U. £ E J79

4. Portion of the surface of a specimen, natural size, showing the ikin inter-

twining walls and rather large interspaces.

4 a. Transverse section, n9.

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A.H.Wbrthan

PLATE IX.

ZAPHBENTIS CENTBALIS E. & H.. Fig. 1. Lateral view of a specimen. Fig. 1 a. View of the calyx. Fig. 2. Ca3t in chert of a speolman from the Burlington limestone.

ZAPHKENTIS CHESTEKENSIS Worthen tig. 3. Lateral view of a specimen. Fig. 8 a. View of the calyx.

ZAPHKENTIS ILLINOIENSIS Worthen

Fig. 4. Lateral view of a specimen. 77

Fig. 4 a. View of the calyx.

ZAPHKENTIS CYLINDKACEA Worthen... ng. 5. Lateral view of a specimen. Fig. 5 a. View of the calyx.

ZAPHKENTIS PELBNSIS Worthen tig. 6. Lateral view of a specimen. Fig. 6 «. View of the calyx.

ANISOPHYLLUM? IOVENSE Worthen. .

W*. 7. Lateral view of a specimen. 8"

Fig. 7 a. View of the calyx.

VOL VIII

.jiifirH.jmn--.Af,

Fossil Corals.

PL ix

30,

\)

.

The Kr= be ,•:,•,,

*tv hnutel

PLATE X.

PAOB. ZAPHBENTIS CLIPFOKDANA? E. & H 75

Fig. 1. Lateral view of a small specimen.

Fig. 1 a. View of the calyx.

Fig. 1 b. Lateral view of a larger specimen,

ZAPHBENTIS CALCABIFOBMIS Hall 74

Fig. 2. Lateral view of a very long specimen. Fig. 2 a. View of the calyx.

ZAPHBENTIS CAEINATA Worthen 75

Fig. 3. Lateral view of a specimen. Fig. 3 a. View of the calyx.

ZAPHBENTIS LANCEOLATA Worthen 76

Fig. 4. Lateral view of a specimen. Fig. 4 a. View of the calyx.

ZAPHBENTIS PABASITIOA Worthen 79

Fig. 5. Lateral view of an attached specimen. Fig. 5 a. View of the calyx.

ZAPHBENTIS SPINUI.OSA E. & H 73

Fig. 6. Lateral view of a specimen. Fig. 6 a. View of the calyx.

AMPLEXUS GENICULATUS Worthen 82

Fig. 7. Lateral view of a large spe3imen. Fig. 7 a. Same view of a smaller specimen.

ZAPHKENTIS SPEKGENENSIS Worthen 77

Fig. 8. Lateral view of a specimen. Fig. 8 a. View of the calyx.

ZAPHBENTIS VAKSOVIENSIS Worthen., 78

Fig. 9. Lateral view of a specimen. View of the calyx.

ZAPHBENTIS ULBICHI Worthen 76

Fig. 10. Lateral view of a specimen. Fig. 10 a. View of the calyx.

ZAPHBENTIS PELLENSIS Worthen 74

Fig. 11. Literal view of a specimen. Fig. 11 a, View of the calyx.

Plate X— Continued.

ZAPHKENTIL DALEI E. & H

Fig. 12. Lateral view of a specimen. Fig. 12 a. View of the calyx.

ZAPHBENTIS CENTBALIS E. & H

Fig. 13. Lateral view of a specimen. Fig. 13 «. View of the calyx.

LOPHOPHYLLUM PROFUNDUM Worthen Fig. 14. Lateral view of a specimen. Fie. u a. View of the calyx.

PAGE.

... 71

72

79

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VOL. VIII.

, Fossil Corals.'

PL.X.

, Y/orthen de!

A H.V/orthen direxi

TheKrebs Lith.Co. ScienSific Pub C in O.

PLATE XL

TRACHYPORA AUSTINI Worthen ........................ ................... 81

Fig. 1. Lateral view of a specimen.

Fig. 1 a. Longitudinal section polished.

Fig. 1 6. Transverse section polished.

Fig. 1 c,d. Sections showing structure under the miero scope.

ATHYKIS SQUAMOSUS Worthen .................... ....................... 103

Fig. 2. View of dorsal side.

RHYNCHONELLA ILLINOIENSIS Worthen ................................ 104

Fig. 3-3 a. Dorsal and ventral views of specimen. Fig. 3 b, 3 c. Front and lateral view.-) of same.

ORTHIS RESUPINOIDES Cox .......................................... . lot!

Fig. 4. View of ventral side.

Fig. 4 a. Lateral view of a perfect shell.

Fig. 4 b. View of a dorsal valve.

SPIRIFERA MOLTIORANOSA Worthen .................................... 1 05

Fig. 5. View of a ventral valve. Fig. 5 a. Lateral view of same. Fig. 5 b. Fragment of the test magnified 4,x.

TEREBRATULA BOWLEYI Worthen ..................... .................. 102

Fig. (>. View of ventral valve.

Fig. C a. View of dorsal valve.

Fig. « b. Lateral view of the entire test.

DISCIXA VARSOVIENSIS Worthen .......................................... 102

Fig. 7. View of ventral valve.

LlNGULA NARSOVIENSIS Worth 611 ........................................ 104

Fig. 8. View of dorsal? valve.

CONULAEIA CHESTEKENSIS Worthen ..................................... 133

Fig. 9. Lateral view of a nearly perfect specimen. Fig. 9 ii. Transverse section of the same.

VOL. VII I

| Miscellaneous

PL. XI

Chas.K.Worthen.deL

A.H.Worthen dirext

Tha Krebs Lith.Co. Scientific Eub. Cin.O.

PLATE XII.

PAGE. POTEBIOCEINUS BUFFALOENSIB Worthen 89

Fie. 1. Anterior view of a nearly complete specimen.

BACTOCRINUS MONTGOMEBYENSIS Worthen 83

Fig. 2. Lateral view of calyx. Fig. 2 a. Basal view of the same.

POTEBIOCRINUS NODOBASALis Worthen 89

Fig. 3. Lateral view of anterior side. Fig. 3 a. Basal view showing anal plates.

DOBYCBINUS MISSISSIPPIENSIS Rcemcr iw

Fig. 4. Lateral view of calyx with spines and column.

BATOCBINUS UJJIONENSIS Worthon 84

Fig. 5. Lateral view of calyx. Fig. 5 «. Basal view of same.

CALCEOCBINUS TUNICATUS Hall, sp w

Fig. 6. Lateral view of body and arms.

CALCEOCBINUS KOBUSTUS Worthen :>2

Fig. Lateral view of tody with a; ms and column.

ACTINOCKINUS LOBATUS Hal! H7

Fig. 8. Lateral view of calyx and ventral tube.

Fig. 8 a. Specimen with a part of t he arm? attached.

VOL VIII

PL. XI'.

Crinoidea.1

3ias:K.Worthen del.

A.H.Worthon dirext

oi Lith.Co. Ssientific Eub.Cin.O.

PLATE XIII.

PAGE.

AGABICOCBINUS NODULOsus Worthen 94

Pig. 1. Basal view of calyx.

Pig. 1 a. Lateral view of calyx, anal side.

AGABICOCBINUS MAC-ADAMSI Worthen 91

Pig. 2. Basal view of calyx.

Pig. 2 a. Lateral view of calyx, anal side.

B ATOCKINUS UNIONENSIS Worthen 84

Fig. 3. Lateral view of calyx and arms.

BATOCBINUS SUBCONICUS Worthen 84

Fig. 4. Lateral view of calyx and ventral tube. Fig. 4 a. Basal view of calyx.

BATOCBINUS NASHVLLLS Troost, sp 85

Fig. 5. Lateral view of calyx and ventral tube.

POTEBIOCBINUS NODOBASALIS WOrtlH'll 89

Fig. 6. Basal view of calyx and arms.

VOL VIII

; Crinoidea.

PL. XIII

Chas.K.Wcrthen.deL

A.H.Worthan Ju-^xt

ThaKrebc Lith I'o. Scisntifu Fub.Cii>.'J-

TJHI7BKSIT7

PL ATH XIV.

PAGE

OENTROCRINUS TENNESSEENSIS Worthen H5

Fig. 1. Lateral view of calyx with arms and column.

EUPACHYCBINUS ORBICULARIS Hall, Sp !>7

Fig. 2. Lateral view of calyx. Fig. 2 «. Basal view of same.

POTEHIOCRINUS spiNULiFERUs Worthen sii

Fig. 3. Lateral view of calyx with arms and column.

BARYCKINUS SPURIUS Hall, sp w

Fig. 4. View of calyx with part of the arms attached. Fig. 4 a. Basal view of calyx.

POTERIOCRINUS ELSAHENSIS Worthen SK

Fig. 5. Lateral view of calyx, anal side.

BARYCRUJUS TUMIDUS '! Hall, sp 100

Fig. li. Basal view of calyx with arms attached.

ALL.OCRINUS TYPUS Wachs. & Spr :!07

Fig. 7. Lateral view of calyx and arms. Fig. 7 a. Basal view of calyx. Fig. 7 l>. Lateral view of same.

AMPHOHACBINUS JEBSEYENSIS Worthen %

Fig. 8. Lateral view of calyx anal side. Fig. 8 a. Basal view of same.

POTEBIOCRINUS RowLEvi Worthen !K>

Fig. Lateral view of calyx with arms and column.

PENTBEMITES OBESUS Lyon? ,

Figs. 10 and 10 a. Cast in flint of a large Blastoid, belonging apparently to the above named species.

rinoidea and Blastoiciea.

•, orthen dtr«tt

: ' - ."'"ientific Pub

PLATE XV.

PAGE

Fig. 1. OKOPHOCRINUS CONICUS \V. & Sp., with pinnules and part of c'olumn pre- served 201

Fig. 2. A specimen of the same species, profile view (enlarged) 201

Fig. The same specimen from the ventral side (enlarged) 201

Fin. 4. BATOCRINUS MACBRIDEI W. & Sp., with arms, column and cirrhi 17:!

Fig. 5. ACTINOCBINUS ODOBBACHIATUS \V. & Sp., from the anterior side 165

Fig. C. TAXOCEIKUS FLETCHEBI Worthen, with arms and column 197

Fig. 7. MEGISTOCEINUS PABVUS W. & Sp., with arms and column 171

(One of the rays has exceptionally but two primary radial-).

Fig. 8. PLATYCBINUS SYMMETRICUS W. & Sp., with arms, column and ross 18«

Fig. 9. TAXOCRINUS FLETCHERi Wortnen, posterior side 197

Fig. 10. KHODOCKINUS KIBBTI W. & Sp., with ariru and pinnules ISO

Fig. 11. TAXOCBINUS (?) INTEBMEDIUS W. & Sp., with arms'Jmd oolnmn 199

Fig. 12. GKAPHIOCBINUS LONGICIRRIFER W. & Sp., anterior side 193

VOL. VIII.

rtf g t ? r/

, Crinoidea and Blasboidea.

PL. XV.

ThaKr"b£ Lith "T dcianKfi^ P.iih Ti

A.H Worthan.diraxt

Chas.K.Worthen del.

532^^v^

OPTHT?^^

PLATE XVI.

PAGE

Fig. 1. DICHOCBINUS INORNATUS W. & Sp., with arm-, showing posterior sidi- in«

Fig. 2. The same specimen, W. & Sp., from the anterior side.

Fig. 3. KHODOCBINUS KIKBYI W. & Sp., with spreading arms 180

Fig. 4. RHODOCBINUS NANUS M. & W., anterior side 1S2

Fig. 5. DOBYCBINUS IMMATUBUS W. & Sp., posterior view of the calyx 1 75

Fig. 6. MEGISTOCBINUS NOBILIS W. & Sp., with arms and column l«i

Fig. 7. Another specimen, showing the ventral surface.

Fig. 8. PL.ATYCBINUS PLANUS 0. & Shum., with arms 1*8

Fig. 9. ACTINOCBINUS OBNATISSIMUS W. & Sp., from the posterior side

Fig. 10. ACTINOCBINUS NODOBRACHIATUS W. & Sp., posterior view of the calyx US

VOL. VIII.

[ Crmoideaj

PL XVI.

10

i

The Krebe Lith.Co. Scientific Eub.Cm.O.

A.H .Wortfien, divext .

Chas. K . Worthen , del.

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PLATE XVII.

PAGE

Fig. 1. POTEBIOCBINUS SPINULIFEKUS Worthen, anterior view 90

Fig. 1 a. The same, posterior view.

Fig. 2. POTEBIOCBINUS OT.BIOHI Worthen, posterior view.. 87

Fig. 8. ACTINOCBINUS OBNATissiMUS W. & 8p., profile view of the calyx 163

Fig. 4. OBOPHOCBINUS FUSIFOBMIS W. & 8p.. with column and pinnules -Ml

Fig. 5 and 5a. DORYCBINUS BADIATCS W. & Sp., posterior and anterior aspect 176

Fig. 6. DOBYCBINU s IMMATUKUS W. & 8p., anterior view 175

Fig. 7. DOBYCBINIIS PAKVIBASIS W & Sp., anterior view 177

Fig. 8. CAPHIOCBINUS GLOBOSUS W. & Sp., with arms 196

Fig. 9. DOBYCBINUS PABVIBASIS W. & Sp., posterior view of the calyx 177

Fig. 9 a, The same, ventral aspect.

Fig. 10. ACTINOCBINUS ABNOLDI W. & 8p 168

Fig. 11. BATOCBINUS MAC-BBIDEI W. & Sp., calyx from the anterior side 172

Fig. 12. Another specimen with arms.

Fig. 13. SC APHIOCBINUS ELEOANTCLUS W. & Sp 111.".

Fig. 14. GBAPHIOCBINUS LONOICIBBIFEB W. & 8p., posterior view 103

Fig. 15. BBODOCBINUS NANUS M. & Vi Iffi

Fig. 16. KHODOCBINUS WATEBSIANUS W. & Sp 184

Fig. 17. DOBYCBINUS IMMATUBUS W. & Sp.. posterior view 17.'.

VOL. VIM.

/ CrinoicLca. an i Blastoidea 1

PL

Cnas.K.Worthen dsl.

A.H.Worthen,dtrqxt.

liie Kre^sZith.Co. Scientific Pub.CIn-0.

. ,(

// tst

,i«u ,9-/(«v Jtel Vi •»»!-/ •tnlliiiO .1; ".>i'il .X£ hfi

PLATE XVIII.

PAGE

ALLOBISMA ILLISOIENSIS Worthen 132

Fig. 1. View of a left valve, natural size. Fig. 1 a. Profile view of the dorsal margin.

LEPTODOMUS? MAGNUS Worthen 107

Fig. 2. View of right valve, natural size. Fig. 2 a, Dorsal view of the s me.

PLEUROPHORUS MONKOENSIS Worthen 125

Fig. 8. Outline view of left valve, natural size. Fig. 3 o. Same valve enlarged 2X.

BAKEVELLIA LLLINOIENSIS Worthen 126

Fig. 4. View of left valve, natural size. Fig. 4 a. Profile view of the same.

SOLENOMYA MONROENSis Worthen 131

Fig. 5. View of a left valve, natural size. Fig. 5 a. Dorsal view of the same.

EDMONDIA ILLINOIENSIS Worthen 122

Fig. 0. View of an imperfect right valve. Fig. 7. Typical specimen, right valve. Fig. 7 a. Dorsal view of the same.

SCHIZODUS DEPRESSUS Worthen 10S

Fig. 8. View of right valve, natural size. Fig. 8 a. Dorsal view of the same.

VOL. vni

PL XVII]

< Lameliitranchiata.i

Chas. R - Wort den , del.

A.H.Worthen

ThaKrcbc Lith..'c. dciantific Pub-Cin.O-

/!/

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irtti'f .1 .ut'i

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PLATE XIX.

PAGE

SCHIZODUS? CIKCULUB Worthen UHI

Fig. 1. View of a single valve, natural size.

SANOUINOLITES? MVLTISTBIATUS Wortheii ]£>

Fig. ?. View of left valve, natural size.

CLINOPISTHA BADIATA Hall sp 122

Fig. 3. View of a left valve natural size. Fig. 3 a. Outlines of a transverse section.

NUCULA ILLINOIENSIS Worthen ] as

F ig. 4. Outline view of left valve, natural size. Fig. 4 «. View of same enlarged 2X.

SOLEKOMYA? lovENSis Worthen K5L'

Fig. 5. Outline view of left valve, natural size. Fig. 5 a. View of same enlarged 2X.

PINNA SANCTI-LUDOVICI Wortheii '. in

Fig. li. Lateral view of specimen, natural size. Fig. 6 n. Outline of a transverse section.

SCHIZODUS VAKSOVIENSIS Worthen ln7

Fig. 7. View of both valves, natural size.

SOLENOMYA VABSOVIENSIS \Vorth6n ]:•>,]

Fig. 8. View of left valve, natural size. Fig. 8 n. Dorsal view of the same.

CABDIOMOBPHA? PELLENSIS Wortheii 12(;

Fig. 9. View of rigth valve, natural size. Figs. n, &. Profile views of same.

AU.OBISMA ELONGATA Worthou i:«

Fig. 10. View of right valve, natural size. Fie. 10 a. Outline of a traiworso section.

VOL. VIII

Lamellibranchiata.

PL XIX.

Shas.K.Worthen del.

A.H."Wbrthen

The Krebs Lith _"o. Scientific Bub Cin.O.

PLATE XX.

r\GE.

SANGUINOLITES BANDOLPHENSIS Worthen I.'W

Fig. 1. View of left valve, natural size. Fig. 1 a. Dorsal view of same specimen.

MODIOLA ILLINOIENSIS Worthen 123

Fig. 2. View of left valve, natural size. Fig. 2 a. Anterior view of same.

SCHIZODUS NAUVOOENSIS Worthen 108

Fig. 3. Cast of left valve, natural size.

PLEUEOPHOEUS MINIMUS Worthen 121

Fig. 4. Outline of left valve, natural size. Fig. 4 a. View of same magnified 2. X.

AVICULOPINNA ILLINOIEN8IS Worthtn 128

Fig. 5. Lateral view of a specimen partially restored in outline. Fig. 5 a. Profile view of same, both natural size.

PLEUBOPHOBUS? CHESTEEENSIS Worthen 12S

Fig. 6, View o' both valves, embedded in the matrix.

CONOC AEDIUM PAEBISHI Worthen 1 12

Fig. 7. Lateral view of specimen, natural size.

BANOUINOLITES? BUBLINGTONENSIS Worthen 12l>

Fig. 8. View of left valve, natural size. Fig. 8 a. Dorsal view of same.

SCHIZODUS ULBICHI Worthen llu

Fig. 9. View of a left valve, natural size.

MYALINA MONEOENSIS Worthen 1-T

Figs. 10 and 10 a. View of opposite valves, natural size.

EDMONDIA VAESOYIENSIS Worthen 121

Fig. ll. View of left valve, natural size. Fig. 11 a. Dorsal view of same.

SCHIZODUS BANDOLPHENSIS Worthen !li>

Fig. 12. Cast in limestone of left valve, natural size.

VOL. VIII

<' Lamellibranchiata.:

PL. XX

y,x MT/.IM

PLATK XXI.

PAUE.

SCHIZODUS ULBICHI Worthen 110

Fig. 1. Cast of right valve showing anterior muscular scar. Fig. 1 a, h. Interior of valves showing cardinal tooth and socket.

CLINOPISTHA BADIATA Hall, sp 12!

Fig. 2. Ventral view, showing the gament.

MACEODON SANGAMONENSIS Win-then l'£>

Fig. 3. View of right valve, natural size. Fig. 8 a. Dorsal view of same.

AVICULOPECTEN PBOVIDENBI8 C-OX, sp 11«

Fig. 4. View of left valve, natural size. Fig. 4 a. Lateral view of same in outline.

AVICULOPECTEN CHESTEBENSIS Worthen 11">

Fig. 5. View of a right valve, natural size. Fig. 5 a. Lateral view of same in outline.

VOL.VIII

Lamellitranchiata.'

PL.XXI

1 a

4 a.

3. a

Sa.

.FIX/ MT/.-l'l

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PLATE XXII.

PAGE.

AVICULOPECTEN spiNULiFEBUs Meek and Worthen 11«

Fig. 1. View of left valve, natural size.

AVICULOPECTEN EDWABDSi Worthen 119

Fig. 2. View of right valve, natural size.

AVICULOPECTEN ELSAHENSIS Worthen 115

Fig. 3. View of left valve, natural size.

AVICULOPECTEN MACWHOKTEBI Worthen 118

Fig. 4. View of left valve, natural size.

AVICULOPECTEN HAKDINENSIS Worthen 117

Fig. 5. View of left valve, natural size.

Fig. 5 a. Fragment of the test magnified 2X.

AVICULOPECTEN OKESTES Worthen 112

Fig. 6. View of left -valve, natural size.

LIMA CHESTEBENSIS Worthen 120

Fig. 7. View of right valve, natuial size.

AVICULOPECTEN MONBOENSIS Worthen 114

Fig. 8. View of left valve, natural size.

Fig. 8 a. Fragment of the test magnified 2X.

AVICULOPECTEN MAZONENSIS Worthen 117

Fig. 9. View of left valvo, natural size.

AVICULOPECTEN NIOTENSIS Worthen 113

Fig. IV. View of left valve, natural size.

AVICULOPECTEN TALBOTI Worthen 114

Fig. 11. View of left valve, slightly enlarged. Fig. 11 a. View of same, natuial size.

AVICULOPECTEN MENABDI Worthen 120

Fig. 12. View of right valve, natural size.

VOL. VIII

Lamellibranchiata.'

PL. XXII

:Ken,deI.

g

r; Jo. Scientific Pub.Cin 0

PLATE XXIII.

PAGE.

DEJJTALIUM tfcLiuoiKNSE Worthen H5

Fie. 1. View of a nearly perfect specimen, natural size.

Mrp.< HISONIA EEOKUK Worlhen Hi

fig. 2. Limestone cast of a nearly perfect specimen. fig. 2 a. Fragment showing; the aperture.

POLYPHEMOPSIS? KBOKUK Worthen '144

fig. 3. Limestone cast of a specimen showing the aperture.

POBCELIJA I-KOIUKN sis Worthen 138

fig. 4. Profile view of dorsal side.

Figs. 4 a and l>. Opposite views of a specimen, natural size.

PLEUBOTOMABIA ADAMSI Worthen 137

fig. 5. View of the spire, natural size. Fig. 5 a. Same enlarged 2X.

PLEUBOTOMABIA HJUNOIENSIS Worthen 135

Figs. 6 and 6 a. Opposite views of same specimen, natural sizo. Fig. 6 6. Profile view of the same.

PLEUBOTOMABIA sp. undet. Figs. 7 and 7 n. Dorsal view, natural eize, and magnified 2X.

PLEUBOTOMABIA OIFFOBDI Worthen 135

Fig. 8. View of spire showing aperture, natural size. Fig. 8 u. Dorsal view of same.

LOXONEMA QUADBI-CABINATUM Worthen 14«

Fig. 9. View of spire partially restored, and aperture, natural size. Fig. 9 a. View of opposite side, natural size.

LOXONEMA PEOBIENSE Worthen 13!i

Figs. 10 and 10 a. View of spire, opposite sides, natural >i >• Fig. 10 h. Outline of the same enlarged 2X.

TBACHYDOMIA NODULOSA Worthen 146

FigB. 11 and 11 a. Opposite views of a peifect specimen, natural size.

VOL. viii

DL>«

f Gasteropoda j

40-

-

PLATE XXIV.

PAGE

MACKOCHEILUS ALTONENSE Worthen 1 i;t

Figs. 1 and 1 n. Opposite views of the spire, natural size.

PLEUROTOMABIA IOVENSIS Worthen iss

Fig. 2. Dorsal view of the spire, natural size.

STHAPAROLLUS SUBUMBILICATUS Worthen !)•_>

Figs. 3 and 3 a. Front and back views, natural size.

Fig. 3 b. Dorsal view of a larger individual, with a more depressed spire.

ORTHONEMA CARBONARIUM Worthen U.-,

Fie. 4 and 4 a. Opposite views of spire, natural size.

PLECBOTOMARIA MONTEZUMA Worthen i:a;

Fig. 5. View of lower volution, natural size.

VOL.VI II.

Gas teropoda..;

Chas.K.Worthendsl.

A.H.Worthsfi dirext

ThaKrebs Likh.Co. Scientific Pub. Gin O.

PLATE XXV.

LEPETOPSIS CHESTERENSIS Worthen Fig. 1. Vertical view, natural size, Fig. 1 a. Lateral view of same.

STBAPAROLLUS VABSOVIENSIS Worthen . Fig. 2. Dorsal view natural size. Fig. 2 a. Profile view of same.

PLEUBOTOMARIA NAUVOOENSIS Worthen Fig. 3. Limestone cast natural size,

NATICOPSIS MADISONENSIS Worthen Fig. 4. Profile view natural size. Fig. 6. Opposite view of same.

BELLEBOPHON GIGANTEUS Worthen. Fig. 5. Dorsal view natural size. Fig. 5 a. Lateral view of same.

MUBCHISONIA LASALLENSIS Worthen

lig. 7. View of spire natural size.

Fig. 7 a. Outline view of same enlarged 2X.

VOL. VI I I.

GasteropodaJ

PL. XXV.

Chas.K WortKen del.

Worthan dirext

TheKrebs Lith.Co. Scientific Eub.Cin O.

I'LATlJ XXVI.

I'AUE.

ORTHOCERAS ILLIXOIEJJSE Worthen , (S

Fig. 1. Viuw of outer eliamber with septa attached.

Fig. : n. View septate portion,

Fitt 1 '(. Transverse section showing position of siphunele.

XAUTILUS MONTGOMERYENSIS Worthen , ,h

Fig. 2. Lateral view; natural size.

OKTHOCEKAS OKAVENSE Worthen IKI

Fig. ». View of a nearly perfect specimen; natural siz«.

OETHOUEBAS LASALLENSE Worthen ,4,,

Fig. 4. View of a specimen natural size. Fig. 4,,. Fragment of tho test enlarged 2X.

GONIATITES MONROENSIS Worthen 150

Fig. 5. Lateral view showing form of the septa>.

VOL VIII

Cephalopoda.;

PL XXVI

Chas.K.Worthen del

A.H.Worthan dirext

The Krebs Lith. Jo . Scitmtific Eub. Gin . O .

•i i. . i /. I/. t il i if 7 '»* -Mtrlu nri"1 UMiv/oif^ wui/

V/ i.t.ia V/HT i.'iff itjia')i) i«A />xj« ItnnTfln // " it«ili«i'ii a.«

PLATE XXVII.

PAGE. N AUTII..US MONTGOMEHYENSIS Worthiin ],|js

FiS 1. Dorsal view showing form of the septa.

ASCOCERAS SOUTHWELL! Worthcn j-j

Fi«. 2. Side view natural size.

Fig. -in. End view showing position of siphunele.

TEMNOCHEILUS SCOTTENSE Worthen ^>\

Fig. S. Lateral view natural si,ze. Fi«r. 3 (i. Profile view of same.

VOL VIII

/ Cephalopoda]

PL XXVII.

Chas.K . Worthen.de!.

A.H.Worthen dirext

TheBtebs Lith.:o. Scientific Puh.Cin.O.

.1117/7 HT/..1M

.KOfll

. U

1'L.VTK XXV11I.

PAGE.

SOLENOCHEII.US (?ENDOLOBUS. INDIAXESSE Worthen 150

Fig. 1. Lateral vie-.v. natural size.

Fig. 1 a. Outline viow of septate portion.

C'OI.POCARIS CHESTEKEXSIS Worthl'll I-"*'

1'is. 2. View of a carapace valve, natural size.

SOLENOCABIS SANCTI-LUDOVICI Worthun 15::

Fig, 3. View of carapace valve, natural size.

VOL VIII

Cephalopoda & Crustacea.

PL. xxvin.

la

o

Q

(«V**SITJ

li'J -•' .31 !

PLATE XXIX.

PAOE

Fig. 1. PHACELOPOHA PEBTENUIS Ulr...:.':.-..'.1. 406

1. A portion of;the zoarium. Natural size.

1 a. Several segments, x 25.

1 b. Vertical section, x 25.

1 r. Transverse section showing relative size and position of the aperture,

and the small lucid spot above, x 50.

Top of Trenton or base of Cincinnati group, Alexander County,' 111.

Illinois State Museum.

Fig. 2. PHACELOPORArcONSTEICTA Ulr 406

The type specimen natural size and magnified 25 times. Tren'on limestone, Bu:g:n, Ky. E. O. Ulrioh.

Fig. 3. PH YLLOPOBIN A GK ANISTBIATA Ulr 689

3. An example showing reverse.Inat. size.

3 <;. Portion of same, x 18, showing character of reverse.

Top of Trenton, Alexander Co., 111. Illinois State Museum.

Fig. 4." PBOTOCKISINA EXIGUA Ulr. (See also PI. LIII.) 405

4. Two examples of the nat. size.

4 a. Poriferous side, showing arrangement of apertmes and accessory

poros, x 18,

4 b. Non poriferous side, x 18. 4 p. Transverse section, x 18.

Cincinnati group, Wilmington, III. Illinois State Museum.

Fig. 5. HELOPOKA IMBMCATA Ulr 644

Lower portion of a segment, x 18.

Cincinnati group, Wilmington, III. Illinois State Museum.

Fig. 5 «. HELOPOBA FKAOILIS Hall. (See also flg. 18, in text,) (i43

The ordinary appearance of a transverse section of this species. Clinton group, Flamborough Head, Canada.

Fig. 6. ABTHBOCLEMA ANGULABE Ulr 641

6. One of the primary segments. Natural size, and x 12, 6 a and 6 b. The upper and lower extremities of or.e of the secondary seg- ments, x 18. At the left of flg. 6n it is shown in natural size. Cincinnati group, Wilmington, III. Illinois State Museum.

Fig. 6 c. ABTHBOCLEMA PULCHELLUM Billings 64?

A transverse section of a primary segment, x 18. At the upper side the section passes through the "socket."

Plate XXIX— Continued.

Fig. 7. NEMATOPOBA LINEATA Billings 646

7. A branch. Natural size.

7 a. Portion of same x 18.

7 b. Vertical section, x 18.

7 c and 7 d. Two transverse sections, x 18, the first abnormal.

7 e. Portion of Id. x 50, to show the minute axial tubes and wall structure.

Anticosti Island. Fig. 8. NEMATOPOBA ALTEBNATA Ulr 646

8 and 8a. Branch, natural size, and a portion, x 18.

Top of Trenton, Alexander Co., 111. Illinois State Museum.

Fig. 9. NEMATOPOBA BETBOBSA Ulr 645

9 and 9 a. Fragment. Natural size, and a portion, x 18. 9 It. Nertical section, x 18.

Top ol Trenton, Alexander Co., 111. Illinois State Museum.

Fig. 10. NEMATOPOBA FBAorns Ulr tilt;

10. A fragment, showing mode of branching. Natural size. 10 o. Portion of same, x 18.

10 ft. Vertical section, x 18. 10 c. Transverse section, x 50.

Top of Trenton, Alexander Co., 111. Illinois State Museum.

Fig. 11. NEMATOPOBA DELICATULA Ulr 646

11. A complete example. Natural size.

11 a. The basal portion x 18.

11 li. Transverse section, x 50.

Alexander Co., 111. Illinois State Museum.

Fig. 12. NEMATOPOBA QUADBATA Ulr 644

12. A branch. Natural size.

12 o. Portion of same, x 18. 12 6. Vertical section, x 18.

12 c. Transverse section, x 50.

Trenton limestone, Trenton Falls, N. I. E. O. Uhich.

VOL VIII

[ Silurian Bryozoa.l

PL XXIX

iiO U hC S del ot iith.

A.H Worlhen u;rexi.

d Krebe Lit

1'LATK XXX.

Fig. 1. PTLLOTIIYPA OBLIQUATA Ulr

1. A fragment of the species. Natural size.

1 «. Surface of same xis>.

1 I,. Tangential section showing usual characters and accessory pore-

1 <: Vertical section. Natural sixo.

1 'I. Portion of same x!8.

1 f. Transverse section xlS.

Cincinnati group. Will Co., III. Illinois State Museum.

Fig. 2. EUEYDIOTYA STEBLINOEKSIS Ulr

•2. A. fragment. Natural size.

2 a. Portion of surface x!2.

Cincinnati group, Sterling, III. Illinois State Museum.

Fig. :j. E0KYDICTYA MONTIFEBA Ulr...

3. A frond showing distribution and character of •'! a. Surface of same x!2.

3 !>. Tangential section x!8.

3 °' ''

onhe "' "f '

»rf. Half of a transverse section. x!8, showing median htbnli Cincinnati group. Wilmington, 111. Illinois State Museum.

EUKYMCTYA CALHOUKENSIS Ulr .....

4. Fragment of a frond. Natural size.

4,,. Surface x!8. The solid monticule'is an usual feat,,,,-

4 <>. Tangential .section xlS.

4 f. Portion of a vertical section x!8.

Trenton limestone. Calhoun Co., III.

Illinois State Museum.

VOL VIII.

PL xxx

Silurian. BryozoeJ

| i •( iith.

A.H.Worthan drrext

TheKrebs Litli Co

PLATE XXXII.

PAGE.

Fig. 1. PACHYDICTYA SPLENDENS Ulr 523

1. An example of the ordidary size and shape, natural size. 1 a. Surface of same x!2.

1 b. Tangential section cutting the zoarium just beneath the surface x!8.

Cincinnati group, Wilmington, 111. Illinois State Museum.

Fig. 2. HOMOTEYPA GELASINOSA Ulr 41(1

2. View of type specimen showing arrangement of the dimple like macula:'.

2 a. Surface of same x!2.

2 6. Tangential section x!8.

2 c and 2 d. Vertical section natural size and a portion x!8.

Cincinnati group, Wilmington, 111. Illinois State Museum.

Fig. 3. HOMOTBTPA PI/ABELLABIS Ulr 411

3. A nearly complete example, natural size. 3d.. Surface of same x!2.

3 6. Tangential section x!8.

3 c. Vertical section showing the thin wavy walls and large cystiphragms

x!8.

Cin?inrati group, Wilmington, 111.

Illinois. State Museum.

Fig. "\. MONTICt'LIPOKA LAMEM/OSA Ulr .'.... 408

4. Portion of the surface of a mass several inches in diameter x!2.

4 a. Tangential section of the usual appearance xli?.

4 6. Part of a vertical section, showing one layer complete and portions of

twe others x!8. The walls have the peculiar structure common to the

genus.

Cincinnati group, Wilmington, 111.

Fig. 5. HOMOTKTPEI.LA CONTEXTA Ulr 412

5. The type specimen of the natural size.

5 a. Tagential section of same, showing the rounded zooecia with their small

acanthopores and cystiphragms, and the anugular mesopores x!8. 5 b. Vertical section of same xI8. The zooecial tubes have a series of cysti- phragms, while the mesopoies only have straight diaphragms. Cincinnati group, Wilmington, 111. Illinois State Museum.

VOL.VMI.

&Ml^^

Silurian Bryozoa.j

PL XXXII.

E.O.-U.&C S, del et hth.

A.H.Worthen dirext

ThaKrubE Li* GxCin..

PLATE XXXIII.

PAGE.

Pit?. 1. PACHYDICTYA EVERETTI Ulr 523

1. An example of the natural size.

1 a. The surface of same, x!2.

1 b and 1 c. Two portions of a tangen.ial section, which divides the zoceoia at different levels, the first showing their character near the surface, the latter just above the median lamina?.

1 d. A small portion of 1 c x50, to show the median tubuli in the cell walls.

1 e. Vertical section, x!8.

1 /. A small portion of a transverse section showing the large median tu- buli and thin median laminae. x50. Trenton limestone. Dixon, 111. Collection of E. 0. Ulrich.

Fig. 2. DlPLOTKYPA PATELLA Ulr

2. An example of the ordinary size.

2 n. Sectional view of same (o show its thickness. Natural size.

2 6. Surface of same, x!2.

2 o. Tangential section, x!8,

2 </. Small portion of a vertical section. xI8.

Cincinnati group, Oxford, Ohio.

E. O. Ulrich's collection.

458

Fig. 3. DIPLOTBYPA? DUBIA Ulr

3. Tangential section of this species, x!8.

3 n. A small portion of same to show wall structure and mesopores, x50.

3 li. Several tubes of a vertical section, x!8.

Cincinnati group, Wilmington, 111.

E. 0. Ulrich's collection.

459

Fi«. 4. CALLOPOKELLA NODULOSA Ulr 418

4. The only example seen. Natural size. It is attached to a fragment of

Strophomena. ^ n. Surface of same, x!2. Illinois State Museum.

Fig. 5. CALLOPOKA SUBNODOSA Ulr 417

5. A fragment of the ordinary size and usual character. Natural size. 5 o. Surface of same, x!2.

5 I. Tangential section, x!8. The right half cuts the cells nearer the surface

than the left. 5 c. Portion of vortical section, showing the tabulation of the tube s, x!8«

Cincinnati group, Blanchester, Ohio.

E. O. Ulrieh's collection.

Plate XXXIII— Continued.

PAGE. Fig. 6. NlCHOLSONELLA CUMTTLATA Ulr 423

6. A fragment showing the usual external features of the species It is

hollow and consists of several layers. Natural size. 6 a. Surface of same, xLJ, More perfect examples recently obtained show

that the interspaces between the zooecia apertures are minutely granu-

lose.

6 b. Tangential section, x!8. 6 c. Vertical section representing part of a layer, much thicker than usual.

x!8.

Cincinnati.~group, Wilmington, 111.

Illinois State Museum.

-ill

VOL VIII

Silurian Bryozoa..]

PL XXXIII

i ..; del et fith.

The Kr-jbe Lith.Co . Scianffic Pub^ Cin O .

•/I///

PLATE XXXIV.

PAGE. Fig. 1. CONSTELLARIA PAKVA Ulr 424

1. A fragment, of the natural size. .

1 a. Tangential section x!8, showing the arrangement of the zoo?cia and mesopores, around one of the stellate macula>.

1 b. Vertical section xlS, showing the tabulation of the zoceeia and meso-

pores.

Cincinnati group, Wilmington, 111.

Illinois Stale Museum.

Fig. 2. TBEMATOPOEA? NITIDA Ulr 419

2, 2 a and 2 6. Four fragments of this species. Natural eizo.

2 c. The surface x!2, showing the form of the small zocecia apertures.

Cincinnati group, Savannah, 111. Illinois State Museum.

Fij.r. '.}. TKEMATOPOBA DEBH.IS Ulr 419

3 and 3 a. Two fragments of thig species, showing its mode of blanching.

Natural size. 3 6. Surface xli 3 c. Tangential section x!8, showing character of zooecia interspaces, and

small aeanthopores.

3 d. Vertical section x!8. The mark at the bottom of the figure indicates

the center of the branch.

Top of Trenton, Alexander County, 111.

Illinois State Museum.

Fig. 4. LEIOCXEMA? WILMINGTONENSE Ulr 426

4. Fragment, natural size.

4 n. Tangential section x!8.

4 l>. Vertical section x!8. The section passes a little obliquely though the branch, causing the tubes to appear interiupted. Cincinnati group, Wilmington, 111. Illinois State Museum.

Fig. 5. NlCHOLSONELLA PONDEEOSi Ulr 422

5. An example of this species showing its regular mode of growth. Natu-

ral size.

Plate XXXIV.— Continued.

PAOE.

5 a. The surface of same x!2, showing its appearance when not abraded.

!}. The outer portion of a vertical section x!8.

5 c. Tangential section x!8, showing the characters of the zooecia and meso- pores in the zones where the latter are not entirely filled with the secondary deposit.

d. Tangential section x!8, showing the appearance where the section passes through one of the solid zones. Trenton limestone, Dixon, 111. E. O. Ulrich's collection. .

VOL VIII.

Silurian Bryozoa.j

PL XXXIV

E.C.U fccC.S del el hth.

A.H.Worthen dirext

ThaKrebs Lith.Co. Scientific Pub. Gin. O.

I'l

PLATE XXXV.

PAGE.

Fig. 1. BATOSTOMELLA SIMULATRIX Ulr 432

1, 1 a and 1 6. Three fragments from Ohio localities. Natural size.

1 c. A slightly more slender example from Sterling, III.

1 d. Surface of 1 a, x!2, shows its usual appearance.

1 e. A small portion of same, x23. showing the perfect condition of the

zoo3cia and mesopore apertures. Also one of the opercular covers. 1 /. Tangential section x!8. 1 g. Vertical section x!8.

Cincinnati group.

Illinois State Museum and E. O. Ulrich's collection.

Fig. 2. BATOSTOMELLA OEACILIS Nicholson 434

Tangential section of the best preserved example seen, xi5. Cincinnati, Ohio.

Fig. 3. BATOSTOMA IMPERFECTU M Ulr 460

3. An example of medium size. Natural size. 3 a. Surface of same, x!2.

3 It. Tangential section, x!8, showing the incomplete diaphragms. 3 c. A small portion of game, x35, to show the structure of^the walls more clearly.

3 d. Outer portion of a vertical section, x!8.

Cincinnati group.

Illinois State Museum and E. O. Ulrich's collection.

Figs. 4 and 5. BATOSTOMA VABIABILE Ulr. (See also PI. XXXVI) 460

4 and 4 a. Two fragments from Savannah, 111. 4 6. A ramose example from Ohio.

4 c and 4 d. Two tangential sections. x!8. The former represents the ap- pearance just below the surface, the latter just after the tubes bend outward.

4 e. About half of a vertical section, x!8. 5. A ramose example from Osgood, Ind.

5 a. This figure is incoireot.

Cincinnati group.

Illinois State Museum and E. 0. Ulrich's collection.

VOL VIII.

t. iattli\Jfli&Jf JJtJPimii

j Silurian Bryozoa..)

PL XXXV.

E.O U.&C.S del et nth.

A.K Worthen dir

ThaKrebs Lith.Co. Scisnffic Pub.Cirv.O.

OP THE

[TJiriYBRSITT] to

PLATE XXXVI.

PAGE.

Fig. 1. BATOSTOMA VAEIABILE Ulr «;o

Surface of example represented, by figure 5, on pi. XXXV, x!2. This specimen is remarkable in having exceedingly few mesopo es.

Fig. 2. AMPLEXOPORA AFFINIS Ulr 460

2. A fragment of this species. Natural size.

2 a. Tangential section of same, showing the thin walls and large acantho-

pores x!8.

Cincinnati group, Wilmington, 111.

Illinois State Museum, and E. O. Ulrieh's collection.

Fig. 3. AMPLEXOPORA PUSTULOSA Ulr 451

3. A subramose example. Natural size. :i a. Surface of same xli.

3 b. Tangential section x!8, showing the thin walls and small acanthopores.

3 c. Part of a vertical section x!8.

Cincinnati group, Hanover, O. E. O. Ulrich's collection.

Fig. 4 LEPTOTBYPA? STIDHAMI Ulr 456

4. A characteristic example of this species. Natural size.

4 a. Tangential section, showing the thin walls, unequal zooecia and large

acanthopores, x!8.

4 b. Vertical section showing the regular tabulation, x!8.

Cincinnati group, Brown Co., Ohio. E. O. Ulrich's collection.

Fig. 5. LEPTOTRYPA SEMIPILAKIS Ulr 457

5. A discoidal example.

5 a. A smaller hemispheric specimen.

5 b. A sectional view of 5, all natural size.

5 c. Tangential section, x!8.

5 d. Vertical section x!8, showing the untabulated long tubes, and several

acanthopores.

Cincinnati, Ohio.

E. O. Ulrich's collection.

Plate XXXVI— Continued.

PAGE.

Fig. 6. LBPTOTETPA HEXAGOXALTS Ulr ..................................................... 455

' 6. An example attached to a small Orthoce.ras or Hyolithes. Natural

size. (i a. Surface of same x!2.

Trenton limestone, Calhoun Co., 111.

Illinois State Museum, and E. O. Ulrich's collection.

Fig. 7. LEPTOTBTPA FILIOSA? (d'Orbigny)

7. Tangential seclion. showing small and infrequent acanthopores, xlS. 7 a. Vertical sextion x!8.

Trenton limestone, Calhoun Co., III. Illinois State Museum.

-•'

VOL. VIM.

: Silurian Bryozoa.]

PL XXXVI.

2o.

&SU9S&

PLATE XXXVII.

PAGE.

Fig. 1. HETEBOTBYPA PBOLIFICA Ulr 413

1. A nearly complete example of the frondeseent form of this species. Natural size.

1 a. Surface of same x!2.

2 6. Tangential section x!8.

1 c. Portion of 1 6 x50, to show the minute structure of walls and acantho- pores.

1 d. Outer portion of a vertical sextion, x!8. Near the I>-ft margin are ehown

some of the peculiar concave diaphragms. Cincinnati group, Blanchester, Ohio. E. O. Ulrieh's collection.

Fig. 2. HETEKOTKYPA INFLECTA Ulr 414

2 and 2 a. Two fragments of this species. Natuial size. 2 b. Surface x!2. Shows its perfect condition.

2 e. Vertical section x!8, showing structure just beneath the surface of a

perfect example. Cincinnati, Ohio. E. 0. Ulrieh's collection.

Fig. 3. HBTEKOTBYPA SINOULAEIS Ulr 415

3. A fragment of medium size. 3 a, one much smaller. Both natural size.

3 6. Surface of (he larger specimen x!2. Slightly worn. 3 c. Tangential section x!8.

3d. Portion of 3c. x50.

8 e. Peripheral portion of a vertical section, x!8, showing the irregular

tabulation of the zooeoial tubes.

Cincinnati group. Wilmington, 111.

IllinoisIState Museum.

i j£U JJLL

VOL VIM.

{ Silurian Bryozoa..]

PL-XXXVII.

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PLATE XXXVIII.

PAGE.

Fig. 1. TBEMATOPOKA CALLOPOBOIDES Ulr 420

1. Natural size view of the type specimen.

1 a. Surface of same, x!2.

1 b. Tangen'ial section, showing small acanthopores, x!8.

1 c and 1 d. Two portions of a vertical section, x!8.

Top of Trenton, Alexander Co., Ill, Illinois State Museum.

Fig' 2. MONOTKYPELLA CBA8SIMUBALIS Ulr 452

2 and 2 a. Two examples of this species showing mode of branching and

size of stems. The drawing of the cells on 2 a, is not natural.

2 1). Surface x!2. In other examples the interspaces are not flattened, and the sloping areas meet.

2 c. Tangential section of an example in which the zooecia are almost iso- lated, x!8.

2 d. Tangential section of another specimen in which the zooecia are mainly in contact x35.

2 e. Vertical secjion of same specimen that furnished 2 c, x!8. It shows the strongly tabulated interspaces.

2 /. Portion of a transverse section, x!8, showing rhomboidal form of zoo?cia

in the axial region.

Cincinnati group, Wilmington, 111.

Illinois State Museum.

Fig. 3. HOMOTBYPA ABBUSCULA Ulr 409

3. Part of a fine example of this species. Natural size.

3 a. Surface of one of the branches x!2, showing the oblique apertures. 3 I*. Tangential section, \ is.

3 c. Vertical section, x!8. This example was not sufficiently developed to

show cystiphragms. Section since prepared prove that in fully matured

examples there are two or three of those structures near the surface

in each zooecial tube.

Blrdseye limestone, High Bridge, Ky.

E. O. Ulrich's collection.

Fig. 4. MOHOTBYPA BECTIMUBALIS Ulr 462

4. A sub-hemispheric example. Natural size.

4 a. Tangential section, x!8. with a small portion at the upper right hand

corner, x50.

4 6. Vertical section, x is, showing the remote diaphragms and thin straight walls.

Cincinnati group, Alexander Co., 111. Illinois State Museum.

VOL.VHI

Silurian Bryozoa.)

PL. XXXVIII.

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A.H.Worthen direct

Th? Krcbs Lith "o . Sciontiflc Pub. Cir- 0 -

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.

PLATE XXXIX.*

PAGE

Fig. 1. CEBAMOPOBA IMBBICATA Hall 463

1. Tangential section showing irregular mesopores, faint lunarium. and

peculiar wall structure. x!8. 1 a. Portion of a vertical section, showing the cellulose basal layer, x!8.

1 6. Tangential section to show the irregular structure of basal layer, x!8.

Fig. z. CEBAMOPOBELLA? OHIOENSIS (Nicholson) 4U6

2. Tangential section showing well marked lunarium, x!8.

2 a. Vertical section, x 18, consisting of a complete layer, and a portion of

another.

Fig. 3. DIAMESOP BA VAUPELI Ulr. (See also PL XLI,) 468

3. Vertical section, x!8. The two sides of the hollow stem have been

brought close together

3 6. About one-fourth of a transverse section, showing thickness of the

zoarium, x!8.

Fig. 3 a. DIAMESOPOBA COMMCNIS Ulr. (See also PL XLI.) 169

Tangential section showing irregular wall structure, mesopores, and lunaria, x!8.

Fig. 4. CBEPIPOBA SIMULANS Ulr. (See also PI. XL.) 470

4. Vertical section, passing through one of the macula1, x!8.

4 a. Tangential section showing a macula and the peculiar lunarin, x!8.

Fig. 5. CHILOPOBELLA FLABELLATA Ulr S81

5. Tangential section showing minute structure as in figures 2 and So, x!8.

5 a. Vertical section showing the long tubular zooeeia, x 18.

5 6. Transverse section, x 18, showing the irregular, thin walled tubes of

the axial region.

These figures are introduced to complete the generic illustrations of the CEEAMO- pOBLDjE, to which this plate is devoted. The species is rather common at the tops of the hills at Cincinnati. Ohio.

Fig. 6. CEBAMOPOBELLA DISTINCTA Ulr 464

6. Tangential section, x!8, showing the characters of the genus.

6 a. Vertical section, x!8, showing two complete layers growing in different

directions.

Cincinnati,;Ohlo. E. 0. Ulrich's collection.

* The thin sections illustrated on this plate, the same as all the others figured on the plates of this volume, were prepared by E. O. Ulrich, and are now in his collection.

VOLVtll.

iJJEiMLfckr IL?" ILLLL

( Silurian. Bryozoaj Ceramoporidae.-

PL. XXXIX.

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PLATE XL.

PAGE

Fig. 1. CBEPIPOBA? EPIDEKMATA Ulr 471

1. Under surface of an example of medium size.

1 a. Upper surface of a fragment showing arrangement of zooecia and

maculie. Natural size. 1 6. Portion of la, x9, showing nearly direct apertures and slightly elevated

lunarium.

1 c. Lower portion of a vertical section from the basal plate up. x!8. 1 d. Upper portion of a vertical section, x!8, showing th^ serrated walls.

1 e. Tangential section, x!8, showing the usual form of the zooaoia and the

radially lined lunaria. Cincinnati group, Wilmington, 111, Illinois State Museum.

Fig. 2. CBEPIPOBA IMPKESSA Ulr 471

2. Natural size view of the type specimen. It is attached to a crinoid

column or some other cylindrical body.

2 a. Surface of same, x!2, showing the exceptionally developed lunaria and

a portion af one of the large maculse. Cincinnati group, Covington, Ky. E. O. Ulrich's collection. Pig. 3. CBEPIPOKA SIMULANS Ulr. (See also Pl.XXXIX.) 470

3. Portion of a large encrusting example, showing distribution of the ele-

vated macula; and zooccia. Natural size.

3 a. Surface of same, xl2.

Cincinnati group, Covington, Ky. E. O. Ulrich's collection.

Fig. 4. CBEPIPOKA SOLIDA Ulr 47:!

4. Portion of a large expansion on the shell of a Cephalopod. Natural size.

4 a. Surface of same x!2, showing one of the solid macula;.

4 b. Tangential section of same x!8, showing the structure of one of the

maculiE and the distinct lunaria. Cincinnati group, Covington, Ky. E. 0. Ulrich's collection.

Fig. 5. CBEPIPOKA HEMISPH.ERICA Ulr 472

5. Profile view of an example of the usual form. Natural size.

5 a. Tangential section x!8, showing character of zooecia and lunaria, and

one of the small maculae.

5 b. Portion of a vertical section x!8, showing tabulation and irregular structure of the walls. Cincinnati group, Wilmington, III. Illinois State Museum.

VOL. VIII.

. ijjmjrjg>r :ne y ' E t :- K

Silurian Bryozoa. J

PL XL

. B del et

A.H.Worthen dirext

TheKrebs Lith.Cb. Scientific Pub.Cin.O.

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PLATE XLI.

PAGE

Fig. 1. CEBAMOPOBELLA STELLATA Ulr 465

1. Natural size, view of type specimen, showing the stellate macula;.

1 a. Surface of same, x9.

Cincinnati group. Sterling, 111. Illinois State Museum.

Fig. 2. CEBAMOPOBELLA GBANULOSA Ulr 466

2. Vertical section, x 18, showing two layers of cells.

2 a. Tangential section, x!8, showing the numerous acanthopore like gran-

ules and other peculiarities of the species. Cincinnati group, Wilmington, IlL Illinois State Museum.

Fig. 3. ANOLOTICHA PONDEBOSA Ulr 473

3. An example of this species, natural size.

3 a. Surface of same, x9.

3 b. Tangential section showing the interrupted appearance of the lunaria, and distribution of zooscia and mesopores, x!8.

3 c. Small portion of a vertical section, x!8, showing the principal charac- ters of the species and genus.

3 d. The central part of a transverse section, x!8.

Cincinnati group, Wilmington, 111. Illinois State Museum.

Fig. 4. DIAMESOPOKA VAUPELI Ulr. (See also PI. XXXIX.) 468

4. 4a and 46. Three examples of this species, natural size.

4 c. Surface of 4, x9.

Cincinnati, Ohio.

E. O. Ulrich's collection.

Fig. 5. DIAMESOPOBA COMMUNIB Ulr. (See also PI. XXXIX.)

5 and 5 a. Two fragments of the ordinary size and appearance.

5 6. Surface x9, showing one of the maculae, and the thick peristomos.

Cincinnati, Ohio.

E. 0. Ulrich's collection.

VOL VIII.

c

Silurian Bryozoa..]

PLXU.

.

E.O U &C S del el Hlh.

A.H.Worthen dirext

Th9Krebs Lith.Co. Sciontifio Pub.Cir, O.

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Sl

PLATE XLII.

PAGE Fig. 1. DlCHOTBYPA GKWfDIS Ulr 498

1, Portion of the type specimen, natural size. 1 a. Surface of same x9.

1 6. Portion of vertical section x!8.

1 c imd 1 d and 1 e. Three parts of a tangential section, x!8, showing the struc- ture at different levels. Niagara group. Kankakee Co., 111. Illinois State Museum.

Fig. 2. DICHOTBYP A FOLIATA Ulr 499

2 and 2 a. Two fragments, natural size.

2 b. Surface x9, presenting the usual appearance.

2 c. Tangential section x 18, cutting the zooecia just beneath their apertures. 2 d. Tangential section, x!8, showing structure near the median laminae. 2 e. Transverse section x!8.

2 / and 2 g. Two vertical sections x!8; the first shows well developed super-

ior hemiseptum.

Hamilton group. Buffalo, Iowa.

E. O. Ulrich's collection.

Fig. 3. TJENIOPOBA OCCIDENTALIS Ulr 505

3. Fragment of this species, natural size.

3 a. Surface of same x9, showing linear arrangement of zooecia.

3 b. Tangential section x!8, showing one of the four faces, and. near the left

margin, the sharply defined vertical lamina. 3 c. Transverse section x!8, showing thickness of outer portion of zoarium.

Hamilton group, Buffalo, Iow,a.

E. O. Ulrich's collection.

Fig. 3 d. T.SNIOPOBA PENNiFOBsns Nicholson 505

Transverse section of this species introduced for comparison with flg. 3c. Hamilton group, Eighteen Mile Creek, N. Y.

Fig. 4. CYSTODICTYA HAMEC/TONENSIS Ulr , ...493

A group of stems showing mode of branching, natural size, Hamilton group, Buffalo. Iowa. E. O. Ulrich's collection.

VOL. VIM.

]Up. Sil.&Dev.Bryozoa.j

PL.XLII.

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PLATE XLIII.

Fig. 1. CYSTOIJHTYA HAMILTONENSIS Ulr. (See also PI. XLII.) J'.W

Surface x9.

Hamilton group, Buffalo, Iowa.

Fig. 2. SCALABIPORA SEPARATA Ulr 5W

An example of this spenies showing the widely soparated transverse

earinw. Natural size.

Hamilton group, Thunder Bay, Mich.

Prof. A. H. Worthon's collection.

Fig. 3. SCALABIPOKA APPBOXIMATA Ul 508

An example of this species natural size. Like the preceding its surface

is not well preserved.

Hamilton group. Thunder Bay, Mich.

Prof. A. H. Worthen's collection.

Fig. 4. EUSPILOPOKA SEKKATA Ulr 526

1. 4 a, 4 l> and 4 e. Four nearly complete examples from Buffalo, Iowa.

E. 0. Ulrica's collection. 4 d. Another specimen from Thunder Bay, Mich.

Prof. A. H. Worthen's collection.

4 e. Surface xl8, showing arrangement of zooecia and granulose interspaces. 4 /. Tangential suction x 18.

4 g. Portion of 4 /, x50, to show more clearly the minute structure of the interspaces.

4 h. Vertical section x25.

Fig. 5. EUSPILOPOBA? BABBISI Ulr 527

5. The largest specimen seen. Natural size.

5 a. Surface of same x9. It is somewhat abraded.

5 b. Vertical section, x!8, showing the tubular oblique zooecia and irregular

median line.

5 c. Tangential section. x!8. 5 rf. Transverse section, x 18, showing the peculiar form of the primitive

portion of the zooecia and the irregularly flexuous mesial line.

Hamilton group, Buffalo, Iowa.

E. O. Ulrica's collection.

Fig. G. INTRAPOBA COSCINIFOBMIS (Nicholson) 532

6. Tangential section x!8, showing the thin zooecia walls and the numerous

mesopores.

tt a. A vertical section x!8, showing form of zocecia and the laminated stru ture of the interspaces.

Hamilton group, Arkona. Ontario.

E. 0. Ulrich's collection.

Plate XLIII— Continued.

PAGE.

Fig. 7. CYSTODICTYA GILBEBTI Meek 320

Two marginal rows of cells in perfect condition, x!8. Upper Helderberg, Falls of the Ohio. E. O. Ulrich's collection.

Fig. 8. COSCINIUM CBIBBIFOKME Prout 497

Marginal row of cells x 18, showing like the preceding the perfect con- dition of the superficial aperture among the OystodictyoniilcK. Ohio Falls.

Fig. 9. BOTBYLLOPOEA sociALis ( ?) Nicholson 490

U. Portion of a large colony, natural size.

9 a. Tangential section of same, x!8, showing four zooecia rays separated by

interstitial vesicles, and at the upper left hand corner several of the

large vesicles filling the spaces between the stars of a colony. 9 b. Vertical section of same x!8, showing part of two layers. The small

tabulated tubes represent the zooeeia.

Hamilton group, Erie Co., N. Y.

E. O. Ulrich's collection.

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VOL VIII.

PL.XLIII.

( Devonian BrvozoaJ

4-e.

E.O U &C S del et hlh.

A.H.Worthen dirext

ThaKrebs Lith.Co. Scientific Pub. Gin D.

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PLATE XLIV.

PAGE

Fig. 1. FENESTEI/LA VESA Ulr. (See also PI. LIV.) 536

1. Obverse x9.

1 a. Reverse x9. The portion -elected has the branches a little closer than

usual.

Hamilton group, Buffalo, Iowa.

E. O. Ulrich's collection.

Fig. 2. FENESTRAPORA OCCIDENTALS Ulr. (See also PI. LIV.) 558

2. An example showing the obverse side. Natural size.

2 a. Surface of same x9, showing the earinse and large pores only, the

branches being covered by the matrix. Hamilton group, Buffalo, Iowa. Prof. A. H. Worthen's collection.

Fig. 3. SEMICOSCINIUM PLANODOBSATUM Ulr 555

3. The obverse side of a finely preserved example. Natural size.

3 a. The upper or reverse face of same, x!*.

3 b. Obverse, x9. The carina is wanting on portions of several branches.

Upper Helderberg, Ohio Falls. E. O. Ulrich's collection.

Fig. 4. SEMICOSCINIUM KHOMBICOM Ulr. (See also PI. LIV.) 556

4. Portion of the obverse surface x9, showing the flexuous branches, thin

keel, and large cells on the dissepiments.

4 a. Portion of the reverse x9.

Hamilton group, Buffalo, Iowa. E. O. Elrich's collection.

Fig. 5. PHYLLOPOBA ASPEEA Ulr B13

5. An example showing only (he basal portion of the zoarium. Natural

size.

5 a. The outer or obverse surface of same x9, showing comparative size of

the inosculating branches and fenestrules, and the irregular elevated points. 5 b. The reverse of same x9.

Upper Helderberg, Ohio Falls. E. 0. Ulrich's collection.

Plate XLIV— Continued.

Fig. 6. PHYLLOPOBA SUPEEBA Ulr. (See also PL LV.)

6. A fragment showing the obverse face. Natural size.

6 a. A large specimen presenting the reverse side. Natural size.

6 6. Portion of flg. 6 enlarged 9x.

6 c. Portion of flg. 6 a enlarged 9x.

Hamilton group, Erie Co., N. ¥.

E. O. Ulrich's collection.

Fig. 7. HBMITBYPA TENEKA Ulr. (See also PL LIV.) 7. The superficial net work, x9. 7 a. The reverse aspect of the zoarium, x9. Hamilton g.oup, Davenport, Iowa. E. O. Ulrich's collection.

.ti'S

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PAGE. .. 613

559

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VOU.VIII

( Devonian tJrYOzoa.)

PL.XLIV

' B iel ot tilh.

A.H.Worthan diroxt

ThsKreba Lith.Jo. Scientific EuU.Cin-0

PLATE XLV.

PAGE.

Fig. 1. RHOMBOPOBA SUBANNULATA Ulr 648

1,1 a and 1 h. Three specimens showing mode of branching and faint annu-

lations. Natural size.

1 e. A somewhat worn specimen doubtfully referred to this species. Natu- ral size.

1 <J. Surface of fig. 1, x!2. showing fully matured condition. 1 e. Tangential se 'tion of an old example, x25.

1 /. Surface of flg. 1 a, Showing appearance of young evamples, x!2. 1 g. Tangential section deeper than 1 e, showing less mature stage, x25. 1 h. Vertical section, x25, showing superior hem'septa and flexuous walls.

1 i. Transverse section, x25. The transverse lines near the margin do not

represent the diaphragms but hemisepta.

Hamilton group, Buffalo, Iowa.

Prof. A. H. Worthen and E. O. Ulrica's collections.

Fig. 2. RBOMBOPOBA SULCTPEBA Ulr 649

2. Fragment, of the natural size.

2 a. Surface of same, x!2, showing the external features of the species.

2 6. Tangential section. x25, showing the thick interspaces and acanthopores.

Hamilton group, Davenport, Iowa. E. O. Ulrich's collection.

Figs. 3 and 4. RHOMBOPOEA LINEINODIS Ulr 649

3. Three specimens showing natural size and manner of growth.

3 a. Surface of right hand example, x!2,

3 b. Portion of central example, x!2.

4. Two examples of a more frequently branching variety of this species.

4 a. Surface of one near its base, x!2. The specimen is either abraded or

has the granules and apertures obscured by a deposit of calcareous

material.

Up. Helderberg. Ohio Falls.

E. O. Ulrieh's collection.

Fig. 5. 0EKAYIA DEVONICA Ulr 416

5. A fragment of a solid branch, showing slight monticules and its irregular

growth. Natural size.

Up. Helderberg, Falls of the Ohio.

5 a. A branching hollow fragment, probably representing another species.

The surface, however, closely resembles that of flg. 5. Hamilton group, Erie Co., N. Y. E. O. Ulrich's collection.

Plate XLV— Continued.

PAGE.

5 b, Surface of 5 a, x!2, showing the irregular zooecia and large acuntho-

pores. 5 c. Vertical section of N. Y. form, x!8. Shows the tubular zooecia, strong

acanthopores, and the epithecal lining of the interior of the branches.

5 d. Tangential section of N. Y. form, showing acanthopores and the gradual

thickening of the walls toward the surface, x!8.

Fig. 6. MONTTCULIPOKA WINCHELLI Ulr 408

6. Tangential section, xlS, showing one of the group of large cells, and the small passage left by the cystiphragms.

6 a. Vertical section, x!8, i-howing the closely arranged cystiphragms. In

most of the tubes they present the appearance of ordinary diaphragm*. Hamil'on group, Thunder Bay, Mich. Prof. A. H. Wortheu's collection.

>

'

.1 .r

VOL. VI 1 1

PL.XLV

| Devonian Brvozoa.j

!f

E.O.U.4<C.S del et lith.

A.H.Worthan diVsxt

The Krebs Lith.Co. Scientific Eub.Cin O-.

.Of

PLATE XLVI.

PAGE. Pig. 1. MONOTBYPELLA SIMPLEX fir 454

1. la'and 1 6. Three specimens showing natural size and mode of growth.

1 c. Surface x!2, showing the thin walls and polygonal form of the zooecia

and portions of two groups of large cells. 1 (I, Tangential section, x!8.

1 e. Vertical section, x!8, :showing tabulation of zoo?cial tubes.

Hamilton group. Rock Island, III E.'O.TUlrich's collection.

Fig. 2. BATOSTOMELLA OBLIQUA Ulr 438

2. Tuberculated example of this spedies. natural size.

2 a. Surface of same, x]2, showing oblique zocecia apertures.

2 7i. Tangential section, x!8, showing peculiar granular structure of the walls and a few small aeanthopores.

2 c. Verticallsection. x!8.

Hamilton group, Alpena, Mich. E. O. Ulrich's collection.

Fig. 3. FISTULIPOBA SPINULIFEBA Rominger -180

3. A characteristic specimen of this species, showing the tiiherciilated sur-

face. Natural size.

3 «. Surface of same, x!2, showing one of tho sub-solid tubi-ivles, thin

granulose walls and other features of the species. 3 ?<. Tangential section, x!8. 3 c. Portion of'S b. x35. showing several of the peculiar hollow granules.

3 d. Vertical section. x!8, showing the gradual decrease in the size of the

vesicles outward.

Hamilton group, Alpena.'Mich.

Fig. 4. PETALOTBYPA COMPKESSA Ulr r.l

4. 4 a and 4 b. Three specimens, natural size, showing mode of growth.

4 c. Tangential section, x!8, with numerous interstitial cells. 4 d. Tangential section, x!8, with very few interstitial colls. 4 e. Portion of 4 rf, x35. showing structure of walls.

4 /. Vertical section, x!8, complete only on the left side of the /IKZUK mesial

line.

Hamilton group, Davenport, Iowa, and Rock Island, 111.

E. O. Ulrich's collection.

Fig. 5. PETALOTBYPA DELICATA Ulr 4.'.4

5. Tangential section. x!8. showing the sub-rhomboidal zoo-cia and their

thin walls.

5 a. Vertical section, x!8, showing the entire thickness of the zoarium, the

short zocecia and strongly flexuous mesial line.

5 b. Portion of fig. 5, x35. showing the structure of the walls more clearly. Hamilton group, Buffalo, Iowa. E. O. Ulrich's collection.

VOL..VIII.

(Devonian Brvozoa.J

PL. XLVI.

J

TL

SOL

4d

—-^

x>rr

E.O.U.&C.S del et Hth.

A.H.Worthen dirext

ThaKrebs Lith.Co. Scientific Eub.Cin 0.

ITI7B-ESIT7

PLATE XLV11.

PAGE.

Fig 1. FISTULIPOBA COMMU MS Ulr. (See also PI. XL VIII) 476

1. Portion of spec.imeii showing its natural size and the direction of its

monticules. Many specimens are without these elevations.

1 n. Surface of same, x!2, showing slightly abraded condition.

Hamilton group, Buffalo, Iowa. Prof. A. H. Worthen's collection.

Fig. -. FISTULIPOKA STELLIFEBA Rominger 481

2. An example natural size, showing distribution. of stellate maculae.

2 n. Surface of same, x!2. showing arrangement of zooe.'ia around the

macula-.

Hamilton group. Thunder Bay. Mich.

Prof. A. H. Worthen'p collection.

Fig. :f. FISTULIPOBA MONTICULATA Ulr. (See also PI. XLVIII) 177

3. A tuberculated example showing mode of growth. Na' ural size.

Prof. A. H. Worthen's collection, (i. Smaller fragment without monticules. Natural size.

E. (). Ulrich's collection. 'i. Surface of fig. S, x!2, showing usual characters.

Hamilton group. Buffalo. Iowa.

Fig. 4. STBOTOPOBA PEBMINUTA Ulr 187

4 and 4 n. Two examples, one of them slightly tuberculated. Natural size. I h. Surface of llg. 4, x!2, showing arrangement of zoceeia and onecia. Up. Helderberg. Ohio Falls. E. O. Ulrich's collection.

Fig. 5. FISTULIPOBA ASTEICA Ulr. (See also PI. XLVill) 477

5. Fragment of this species; natural size. ."i li. Surface of same, x!2.

Hamilton group, Buffalo, Iowa. E. O. Ulrieh's collection.

Fig. ti. FISTULIPOBA COLLINA Ulr. (See also PI. XLVIII) 478

6. About hah" of a subeircular expansion; natural size.

a. Surface of same, x!2, showing the thin interspaces and faintly elevated lunarium.

Hamilton group, Buffalo, Iowa. E. O. Ulrich's collection.

Plate XLVII— Continued.

PAGE.

Pig. 7. FISTULIPOBA FOOBDI, U!r. (See also PI. XLVIII) 479

7. A specimen showing distribution of maculje and zooecia.

7 a. Surface of same, x9, showing the opercular covers closing many of the

triangular zocecia apertures. Hamilton group, Roekford, Iowa. E. O. Ulrich's collection.

Fig. 8. FlSTULIPOKA COKRUGATA Ulr 480

8. Portion of a large expansion showing the strongly wrinkled unde .• sur-

face, and at the bottom a small fragment showing the eelluliferous aspect.

8 (i. Celluliferous surface, x!2. showing one of the maculue and the arrange-

ment, of the zooeeia aperture. Hamilton group, Thunder Bay, Mich. Prof. A. H. Worlhei.'s collection.

VOL.VIII

{ Devonian Brvozoa.J

PL.XLVII

la,.

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PLATE XLVIIi.

PAGE.

Fig. 1. FISTULIPOKA COMMUNIS Ulr. (See also PI. XLVII) 476

1. Vertical section, x!8.

1. a. Tangential section, x!8, showing circular form of zooecia the absence of

lunaria, and what appear to be minute perforations in the walls of the interstitial vesicles.

Fig. 2. FISTULIPOBA MONTICULATA Ulr. (See also PI. XLVII) 477

2. Tangential section, x!8, showing slight development of lunaria, and rela-

tive size of zooscia and mesopores. 2 a. Vertical section. x!8.

Fig. S. FISTULIPOKA ASTRICA Ul.. (See also PI. XLVII) 477

3. Tangential section, x!8, showing strongly developed lunaria and other

features of the species.

Fig. 4. FISTULIPOKA FOORDI Ulr. (See also PI. XLVII) 479

4. Portion of vertical section from the surface down, x!8.

4 a. Tangential section, x!8. showing form and relative size of zooacia and

mesopores and the conspicuous lunaria.

Fig. 5. FISTULIPOHA COLLINA Ulr. (See also PI. XLVII) 475

5. Tangential section, x!8. The lower lelt hand, portion of the figure repre-

sents a macula. To the right the zooeeia are separated by gradually decreasing interspaces.

5 a. Vertical section, x!8, showing the thin and lightly flexuous walls and

several diaphragms wh'ch appear to be minutely perforated.

Fig. 6. FISTULIPOBA ? COKKUGATA Ulr. (See also PI. XLVII) 480

6. Tangential section. x!8, showing the structure of the zoarium just be-

neath the surface, where the interspaces between the zooscia are almost entirely filled with solid tissue.

6 «. Tangential section, x!8. showing the structure just above the basal lamina. Here the zooecia are arranged in longitudinal series between vertical plates, precisely as in Dichotrypa.

6 b. Vertical section, x!8, showing the full length of the zooecial tubes, the

interspaces filled with solid tissue above, moderately developed super- ior hemisepta, and the wavy basal plate.

Plate XLVIII— ( ontinued.

PAGE.

Fig. 7. BUSKOPOBA LUNATA (Romingei) 489

7. A lamellate example wi h slightly elevated maculas over about half of

the surface. Natural size. 7 a. Surface of same, x9. 7 h. Portion of 7 a, x!8, to show more clearly the characte; of the peristomes,

lunaria and interspaces. 7 c. Another portion of the surface showing many of the cells partially

closed by a membrane, x9. 7 d. View of the broken edge, x!8. Shows the vesicular interstitial tissin',

and several zooeeial tubes with the grooved internal ridges.

Upper Helderberg, Ohio Falls.

E. O. Ulrieh's collection.

jrti

VOL.V.II

( Devonian BrYozoa..']

PL.XLVIU

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PLATE XLIX.

PAOI.

Fig. 1. FENESTELLA BUKLINOTONENSIS Ub- 636

1. Obverse face of a frond showing the usual characters of the species. x9.

1 a. Obverse side of another specimen having thinner branches and morn elongate fenestrules, x9. Burlington limestone, Burlington, Iowa. Illinois State Museum.

fig. 2. FENESTELLA FILISTBIATA Ulr 536

2. Several branches showing the fine stria; and distribution of the zonscia

apertures, x9.

•2 a. The reverse face of a "frond" showing the relative size of the branches and fenestrules, x9. Nearer the base the branches are comparatively a little stronger.

Burlington limestone, Burlington, Iowa. Illinois State Museum.

Fig. •'(. FENESTELLA RUDIS Ulr 537

3. Obverse face of a frond, x9, showing the characters of the branches and

other features of the species near the base.

Bentonsport, Iowa. Keokuk group.

Illinois State Museum. 3 n. Reverse aspect of another specimen showing the subnodose character

of the branches, x9. 3 b. Obverse side of a line specimen showing the appearance of the frond

toward the upper margin. Also several of the supposed ooacia, x9.

Keokuk group. Warsaw, 111.

Illinois State Museum.

3 c. Portion of fig. 3 b, x!8, to show the tine striations, compressed tuber- cles, and the opercular covers.

3 (/. A small portion of the reverse of a well preserved example, showing

irregular nodes.

Keokuk group, Nauvoo, 111.

E. O, Ulrich's collection.

Fig. 4. FENESTELLA LIMITABIB, Ulr 538

4. Obverse face, x9, showing the relative size of the branches and fenes-

trules, the obsolete carina. and the rather large and regularly alternat- ing zooecia apertures.

4 a. Reverse of same specimen, but from another portion where the branches.

are more rigid, x9.

Keokuk group, Bentonsport, Iowa,

Illinois State Museum.

VOL. VIII.

Low Garb Bryozoa.f

PL XLIX.

i a.

E.C a 3cC e del st ht

.A H.Wor',hr,n

Ih« Ki-Rts iith Co 5a«ntifi7 Pab Cia. :

PLATE I,

PAGE.

Tig. 1. F'ENESTELLA KEGALIS Ulr. (Bee also PI. LIV) 538

1. Portion of the obverse face of a nearly complete frond, x9, showing rela- tive size of branches, dissepiments, andl fenestrules, and the strong carina. 1 <i. Reverse aspect of a frond, x9.

Keokuk group. Kings Mountain, Ky. E. O. Ulrich's collection.

Fig. 2. FENESTELLA COMPBESSA var. NODODOBSALIS Uh- 540

Portion of I he reverse face of a large frond, x!>, showing the strong

irregular nodes and the relative size of the branches, dissepiments and

fenestrules.

Keokuk group, Kings Mountain, Ky.

E. O. Ulrich's collection.

Fig. 2 a. FENESTELLA COMPBESSA Ulr 539

The obverse side of a very perfect example, x9, showing the narrow

branches, prominent carina with its row of tubercles, and the angular

dissepiments.

Keokuk group. Kings Mountain, Ky.

E. O. Ulrich's collection.

Fig. 3. FENESTELLA MULTISPINOSA Ulr 540

3. The obverse face of the basal portion of a frond, x9. Keokuk, Iowa. fi. O. Ulrieh's collection.

3 a. The reverse side of same, x9, showing rounded feuestrules and the numerous granules on both the branches and dissepiments. Farther out on the fronds the dissepiments are thinner, the fenestrules more nearly subquadrate and the branches appear straighter.

3 b. Thin section, x!8, showing structure of the dense substance on the re- verse.

3 c. Obverse face of a frond sh owing the appearance near the free mar- gin, x9.

3 d. Thin section of a specimen with slightly larger fenestrules th-m usual, x!8. Shows the minute structure at different levels. Kookuk group, Kings Mountain, Ky. E. O. Ulrich's collection.

Plate L Continued.

PAGE.

Fig. 4. FENESTELLA TEISEBIALIS Ulr 541

4. Obverse face of an example in a fairly good state of preservation. x9. The

long tubular spines which are now known to have been present be- tween the aperturas of each range, were broken away in freeing the specimen from the shaly matrix.

4 a. Thin section showing structure of frond at different levels, x!8. At the

lower left hand corner the black spot represent the bases of the tubular spines.

Fig. 5. FENESTELLA SEKEATULA Ulr 544

5. Obverse face of a perfect fragment, x9.

5 a. Portion of flg. 5, x!8. showing as usual three cell apertures to the fenes-

trule.

5 b. Reverse aspect of same specimen, x9. In other examples the dissepi- ments are somewhat stronger and the fenestrules a little wider.

5 c. Profile view of a branch to show the serrate appearance of the carina. Warsaw beds, Warsaw, III. Illinois State Museum.

: 'i: ii ••• . RU ni dl -in!,

VOL. VIII.

j Low Carb Bryozoa .[

PL L.

'• ••• r &c.s dc; j;

A.H Worthan dirext

ThaKr-jbe LitK.Co. Scientific Eub.Cin.O.

PLATE 1,1.

PAGE

Fig. 1. FENESTELLA EXIGUA Ulr 545

1. Obverse face of the best specimen seen, showing the narrow and flightly

flexuous branches, x9.

1 (i. Reverse face of same, x9. The tubercles are not as strong as usual.

Warsaw beds, Monroe Co., 111. Illinois State Museum.

Fig. 2. FENESTELLA TENAX Ulr 546

2. Obverse face, x9, showing the usual appearance of the Warsaw beds form.

2 a. Portion of same. x!8.

2 6. Reverse aspect of another fragment, x9.

Monroe Co., 111.

Illinois State Museum. 2 c. Several branches of a specimen of the Chester group form,x!8. This

agrees with the Warsaw beds specimen. 2 <J. A branch and two rows of fenestrules, x!8, showing their usual form

and relative size.

2 e. The reverse side of a branch of a variety with larger fenestrules and

only 24 or 25 cells in 5 mm., x!8. Chester group, Sloan's Valley, Ky. E. O. TJlrich's collection.

Fig. 3. FENESTELLA ELEVATIPOBA Ulr 549

3. Obverse side of a fragment, x!8. As seen lying on the surface of slabs

the nearly flat branches appear almost to be in contact.

3 o. Reverse side of another fragment showing the strong rounded stria-

tions, x!8.

Chester group, Kaskaskia, 111.

Illinois State Museum.

Fig. 4. FENESTELLA FLEXUOSA Ulr 548

4. Obverse face of a fragment, x9, showing strongly flexuous branches. The

tubercles on the keel are not shown strong enough.

4 a. Reverse side of another specimen, x9, showing the usual appearance of

this side.

4 6. Several branches of a very perfect fragment, with the branches some- what more rigid than in fig. 4, xi.

4 c. End view of several branches showing their form and the elevations of the tubercles, x9.

Chester group, Sloan's Valley, Ky. E. O. Ulrich's collection.

Plate LI Continued.

PAGE.

Fig. 5. FENESTELLA CESTBIENSIS Ulr 547

5. Eeverse side of a frond showing narrowly rounded brandies and irregu-

larly distributed nodes, x9.

Chester group, Sloan's Valley, Ky.

E. 0. Ulrieh's colle3tion.

5 a. Thin section, x!8, showing foim of zoopcia at diferent levels. 5 b. Obverse face, x9, showing the relative size of branches and fenestrules,

the thin carina;, and the small nodes on same.

Chester group, Kaskaskia, 111.

Illinois State Museum.

.Ihlail- l.n* w"-niui oriJ unr/c-rt- .fl-jo* ii'.mh>-«i« 1«»J >»dt Fig. 6. FENESTELLA FUNICULA Ulr -,(2

6. Obverse side of a specimen, x9, showing the lax growth, cord-like carina

and the peculiar zooecia apertures. Keokuk group, Keokuk, Iowa. E. 0. Ulrkh's collection. HK.

.(UT'l Hll'Jlf /< .

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VOL VIII.

Low Garb Bryozoa.f

PL. LI.

EG U.&C.8 del.et lilh.

A.H.Worthen dirext

The Krebs Lith. .'o . Saenffic Pub. Cin . O .

PLATE LII.

•'. T .v.~i ,n'>tni'>'in» t>in«VB lo •*•>& nmovdO i,

PAGE

Fig. 1. FENESTELLA CINGULATA Ulr 543

1. Obverse surface, x9, of the best specimen seen. In manv the dissepi- ments are more elevated.

1 o. Reverse of a variety of this species having longer fencstrules than usual, x9.

1 ft. Thin section, x!8, showing structure just beneath the zooe 'ia aper- ture.

1 c. One of the zooecia of flg. 1 b, x50, to show the ring of minute tubes.

1 '/. Another portion of same section where it passes through the zoarium near the reverse face, x!8. Keokuk group, Nauvoo, 111. E. 0. Ulrich's collection.

Fig. 2. FENESTELLA DELICATULA Ulr 549

Fragment of this species showing the obverse side, x9. Lower Coal Measures, Seville, 111. Illinois State Museum.

Fit'. 3. FENESTELLA MODESTA Ulr 550

3. Portion of a gutta-percha cast,x9.

3 a. One branch of fig. 3 more highly magnified, x!8.

3 li. From a gutta-percha cast of a fragment showing reverse, x9.

Lower Coal Measures, Knox Co., III. Illinois State Museum.

FJK. 4. FENESTELLA PEKMINUTA Ulr 551

4. A small almost complete specimen, x9.

1 a. Same, x18, showing the faint carina, and the projecting Izooocia.

4 6. One branch of another specimen showing the reverse, x!8.

Lower Coal Measures, Seville, 111. Illinois State Museum.

Fig. 5. FKNESTELLA WOKTHENI Ulr 551

5. Portion of a specimen showing the obverse side, x9.

5 a. A branch and row of fenestrules of flg. 5, more highly magnified to

show more clearly the peculiar keel with its row of minute pores,

x!8.

Lower Coal Measures, Seville, 111.

Illinois State Museum.

Fig. 6. FENESTELLA SEVILLENSIS Ulr 552

6. Portion of a fragment, x9.

6 a. One branch, x!8, to show the peculiarities of the cells and keel. 6 b. Reverse, x!8.

Lower Coal Measures, Seville, 111. Illinois State Museum.

Plate LII Continued.

PAGE.

Fig. 7. FENESTELLA MIMICA Ulr 552

7. Portion of a specimen showing the obverse side. x9.

7 n. Several branches of same, x!8, for comparison with fig. 6«.

Lower Coal Measures. Seville, 111. Illinois State Museum.

Fig. 8. FBNESTEIXA CONBADI Ulr 553

8. Obverse face of average specimen, x9. The flattened elevations on the

keel should be more conspicuous.

8 «. Shows the appearance of the reverse of same,x9.

Upper Coal Measure, Bed Oak, Iowa. E. O. Ulrich's collection.

Fig. 9. FENESTELLA IN^QUALIS Ulr. (See also PI. LIV.) '54

9. An example showing the characters of the obverse face, x3. 3 a. Beverse side, x!t, showing the distinct granular strise.

„,. Upper Coal Measure, Sangamon Co., III. Illinois State Museum.

.Six .<

- .e«io<[ alunlni V) wir

VOL. VIII.

Carb Bryozoa

PL. Lll.

li

E.C .U.ScC.S del et n'lh.

A.ri .Worthan, dirext.

TheKrebs Litn.Co. Scientific Pub.Cir. 0.

PLATE LIU.

PAOB.

Fig. 1. PHYLLOPOBINA TBENTONENSIS Nicholson 640

1. Thin section cutting: the zoarium through the plane of expansion, x!8.

1 a. Portion of same section showing the tubular zocecia just beneath their

apertures, xlS. 1 b. Transverse section of a branch, x!8.

1 c. Verti al section of the branch, x!8, showing basal plate, tubular zooecia

and closely tabulated mesopores. Trenton limestone, Belleville, Canada.

Fig. 2. PHYLLOPOKINA BETICULATA Hall ._ 639

2. Vertical section of branch, x25, showing basal plate, tabulated zocecia, and

one of the tubular spines.

2 a. Section, x25, cutting the zoarium through the plane of expansion.

Trenton limestone, Trenton Falls, N. Y.

Fig. a. PHYLLOPOHINA COBTICOSA Ulr 639

3. Vertical section of branch, x!8, showing characters very much as in 1 c.

only tne zooecial tubes have diaphragms.

3 a. Section x!8, cutting the zoarium through the plane of expansion show-

ing among other characters the strong mesial plate in the branch to

the right.

Trenton shales, Cannon Falls, Minn.

Fig. 4. PHYLLOPOBINA ASPEBA Hall (39

4. Section, x!8, showing structure of zoarium just below its celluliforous

face.

4 a. Portion of same section showing structure of the thick basal plate, x!8. 4 ft. Vertical section of a branch, x25. None of the zooocia are shown full

length.

4 c. Transverse section of two branches and dissepiment, x25, the latter

apparently non-celluliferous. Chazy limestone, Mingan, Canada.

Fig. 5. PHYLLOPOKINA ASPEBATU-STBIATA Hall 639

5 and a a. Two portions of a section,. x!8, passing through the plane of ex-

pansion. The first shows structure of zoarium just above the basal plate, while the second shows the structure just beneath the zocecia apertures, where they are more or less completely isolated by the closed mesopores.

5 6. Vertical section of a branch, x!8, showing form of zooecia and the filled mesopores. Niagara group, Lockport, N. Y.

Plate LIII ( ontinuerf.

PAGE.

Fig. 6. DBYMOTBYPA DICHOTOMA Ulr 399

6. Section passing through the plane of expansion, x25. It shows the struc-

ture of the zoarium at different levels, and at the top of the right

branch, where it is somewhat twisted, the full length of the zorecial

tubes.

Trenton limestone. Montreal, Canada.

Fig. 7. DKYMOTEYPA DIFFUSA Hall 39ft

7. Transverse section of a branch, x!8, showing row of abortive cells on

lower side of central lamina, and the distinctly laminated structure of the solid portions of the zoarium. 7 a. A tangential section, x!8.

7 '). Vertical section, x!8, showing thick basal plate, the form of the zouecia

and the abortive cells. Niagara group, Lockport, N. Y.

Fig. 8. MITOCLEMA CINCTOSUM Ulr 309

8. Vertical section of a branch, x!8, showing the long tubular, thinwalled

zooecia, and three cycles of apertures.

8 a, 8 l>. Two transverse sections, x!8, the first passing through the stem .n Just beneath, the second just above n ring of apertures.

Chazy limestone. High Bridge. Ky.

Fig. 9. DlPLOCLEMA TBENTONENSE Ulr 36!'

9. Tangential section of a branch, x!8, showing the zooacia cut at varying

levels between the apertures and the median line.

i> n, 9 h. 9 c. Three transverse sections, x!8, showing the'comprcssed form of the branches, and slight modifications in structiiii'. Trenton group. Trenton Falls. N. Y. .tut'.'.

Fig. 10. DlPLOCLEMA 8PAESUM Hall 369

Tangential section. x!8, showing structure similar to lower half of tic. 9. Niagara group, Lockport, N. Y.

Fig. 11. PBOTOCBISINA EXKIUA Ulr. (See also PI. XXIX.) 405

11. A deep tangential section ,x!8, showing the tubes that open on the side

of the branches throughout their length. 11 a. Portion of same section where it passes just beneath the mouths of

the dorsal rows of cells, x!8. 11 6. Vertical section, x!8. 11 c. The same kind of section as fig. 11, taken from Trenton Falls, N. Y.

specimen, in which the zotuoia are a little shorter than usual. 11 d, 11 e. Two transverse sections, x!8, showing the four ranges of zooecia,

and the thick outer walls.

Trenton limestone, Montreal, Canada, and Trenton Falls, N. Y. ••rfj cd i

Irtlllt yAt Inn;

ufliX

VOL. VIII.

JiiiiilL, ifJEIi-yjtr •:fty'Efr3K

I Silurian Bryozoa.)

PL till.

E.O U &C.S del et iilh

A.H.Worthen.diruxt ThsKrebe Lilh.Jc. Scisntific Pub. Cin 0.

•in V' :!('!!•'•- v -; . f *«unT .^ '.

PLATE LIV.

PAGE.

Fig. 1. PHYLLOPOKINA DA~VSONI Ulr 331

1, 1 a, 1 b. Sections passing through the branohe . near the middle of their

thickness, x!8. 1 p. A slightly oblique seotion. showing mature form of zooscial apertures,

and accessory pores, x!8. 1 d. A vertical seotion. 1 e. If, 1 g. 1 h, 1 i. Five transverse sections showing the moderate keel.

The zooecia appear different in each because each section I'euts them

at a different point in their length, x!8.

Fig. 2. FENESTELLA BELLISTRIATA ? Hall 331

Section showing straight mesial line, and oblique walls, between the ends ol the zooecia, x!8. Compare with flgs. 1 b and 4. Niagara group, Waldron, Ind.

Fig. 3. FENESTELLA VEBA Ulrich. (See also PI. XLIV) 535

Section, xlS, showing structure at different levels. Hamilton group, Buffalo, Iowa.

Fig. 4. FENESTELLA INJBQUALIS Ulr. (See also pi. LID 554

4. Deep section, x!8, showing primitive portion of zomaia with the inferior

hemiseptum in those of the right branch, and the inflections produced

by the superior one in those of the left branch. 4 a. Portion of section nearer the level of the cell apertures, x!8. The depths

at which the section passes through the branch increases gradually

from below upwards.

Upper Coal Measures, Sangamon Co., 111.

Fit,'. .'.. FENESTELLA EEOALIS Ulrich. (See also pi. L) 638

Section, x!8, showing the large zooecia and the minute tubuli which

pierce the outer crust.

Keokuk group, Kings Mountain, Ky.

Fig. (). ISOTBYPA QOXHLANDIOA Ulr 678

(i. Horizontal section, x!8. showing form and arrangement of cells and, on the left side, the lower portion of the keel.

C a, ti 6, 6 c. Represent three transverse sections; a. a branch with dissepi- ments and keel; b, two branches with the keel united; and c, a branch just about to bifurcate, with two keete. Upper Silurian, Gotland.

Plate LIV— Continued.

PAGE.

Fig. 7. FENESTRAPORA OCCIDENTALS U!r. (See also pi, XLIV) 558

7. A vertical section through height of branch and keel. x!8.

7 a. Horizontal section, showing only the keel with three of the shallow cells, x!8.

7 b. Transverse section of two branches with keels, x!8.

7 c. Part of a veitical section of the basal portion of the zoarium, x!8. At the upper left hand corner is represented a portion of the outer sub- solid layer. In the lower portion of the figures is shown some loose vesicular tissue which fills the bottom of the infundibular stalk, while the central portion of the figure is occupied by a branch with a num- ber of cells. Between the branch and the outer membrane the space is filled by vesicular tissue. x!8.

7 d. Horizontal section of the non-celluliferous face, showing large acces- sory cells, and two sets of minute tubuli, xlS.

7 e. Horizontal section showing the characters of the zoarium at different levels, x!8.

ttlllft -I'll-.' l.iji! I- :'. '

Fig. 8. SEMICOSCINIUM KHOMBICUM TJlr. (See also pi. XLIV) 566

Horizontal section of an old example, x!8. The half of the figure to the right represents a portion of the section where it passes through the region included between the cell apertures and the tops of the keels. As shown, this region is occupied by irregular vesicles. Hamilton group, Buffalo, Iowa.

Fig. 9. HEMICOSCINIUM SP. UNDET.

Transverse section of a branch showing a thin knife-edge keel, x!8. In other species of this genus the keel is expanded or even flattened at the summit.

Hamilton group, Bake Oven. III. TOi'i^ln: "ih ilJiw u,' . ' ' '

Fig. ' 10. HEMITRTPA TENEBA TJlrich. (See also pi. XLIV) 559

10. Horizontal section, x!8, showing only thu principal bars on the right Hid'1, and the secondary bars and scalar of the superficial network on I tHa left side.

10 a. Horizontal section of the branches, x!8.

10 6. Vertical section of a branch, x!8; the lorver series of openings repre- sent the zooecia, while the upper series represent the spaces between the columns which support the superficial structure. '"''»<$. Transverse section of a branch through one of tin- columns. x!8. Hamilton group, Davenport Iowa.

OT8 ,

no .baa fJltto lo 'i

-i" liar .

VOL.VIII.

(Fenestellidae.l

PL. LIV

Id. Ic. 2

E.O.U.&C.S del et

A H Vi.'o: tner., d;r(.xc. wb« Lith£o. S^ar.unc Tab Cir. C

v - 7. 1

PLATE LY.

PAGE.

Pig. 1. PULYPOBA INOEPTA Hall? 358

Horizontal section showing characters of zooecia at successive

stages. x!8.

Niagara group, Waklron, In«l.

-.11

Fig. 2. POLYPORA SHUMAKDI PrOUt. 586

2. Horizontal section, cutting the zooecia transversely at a point midway

between their apertures and the basal layer, x!8. 2 a. Portion of same section where the characters of the cells just beneath

their mouths, is shown, x!8. 2 6, Basal layer, x!8.

2 c. A vertical section, x!8, showing the nearly erect zooaoia. 2 d. Transverse section of two branches united by a dissepiment, x!8.

Upper Helderberg group, Utica, Ind.

Fig. 3. POLYPOBA COETICOSA? Ulr. (See also PI. LX) ..." 596

Horizontal section, x!8, showing structure of obverse half of zoarium. Chester group, Litchfleld, Ky.

Fig. 4. POLYPOBA CESTBIENSIS Ulr. (See also PL LX) 594

4. Horizontal section of two branches just above a bifurcation, x!8. 4 a. Horizontal section of a large branch, x!8.

4 b. Another portion of the branch shown in 4 a, showing the zoarial char- acters just beneath the zooecial apertures. Chester group, Sloan's Valley, Ky.

Fig. 5. FENESTRALIA SANCTI-LUDOVICI Prout. (See also PI. LIX) 604

Horizontal section, x!8, showing median keel and two rows of cells on

each side.

Warsaw beds, Warsaw 111.

Fig. 6. THAMNISCUS SEVILLENSIS Ulr. (See also PI. LXII) 610,727

Horizontal section, x!8.

Lower Coal Measures, Seville, 111.

Fig. 7. LYKOPOBA QUINCUNCIALIS Hall. (See also PI. LVIII) 583

7. Horizontal section, x!8. Shows the inferior hemiseptum very clearly. In

most cases it divides the cell into two distinct portions. 7 a. Portion of a horizontal section, x!8, showing characters just beneath

the cell apertures.

7 &. Vertical section, x!8, showing form of zooeoia and inferior hemisepta. 7 c. Transverse section of two branches, x!8.

Chester group, Sloan's Valley, Ky.

Plate LV— Continued.

PAGE.

Fig. 8. LYBOPOBA OVAIJS Ulr. (See also PI. LVIII) ...................................... 5^5

Vertical section showing large cells with well developed hemicepta, x!8. Chester group, Litchfleld. Ky.

Fig. 9. PHYLLOPOBA SUPEBBA Ulr. (See also PL XLIV) ................................ 613

9. Vertical sestion, x!8, showing large erect zoo?cia.

9 a, Horizontal section, x!8. The lower half represents the dense dermal layer, while in the upper half the zocecia are shown. Hamilton group, Erie Co., N. Y.

.81. Fig. 10. PHYLLOPOBA? sp. indet ............................................................. 612

Horizontal section, x!8, showing the structure of the zoocoia at levels varying between their apertures and the basal layer. Hamilton group, Widder, Canada.

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VOL VIII.

(Fenegtellidae.

PL. LV.

Jt lllh.

A. H \Vbrthen, diruxt. TheKrebs Lith.Co. Scientific EuU.CinO.

PLATE LVI.

PAOB

Fig. 1. ACANTHOCLADIA ANCEP8 Schlothcim 63S

1. Horizontal section of main stem and portions of two pinnae, xl*. Shows

' in the lower part the two principal ranges of zooeeia. 1 a and 1 b. Vertical and transverse section of midrib, x!8. 1 c. Slightly oblique transverse section of one of the lateral branches, x!8. Permian, Poesneck, Germany.

Fig. 2. PINNATOPOEA ELEGANS Young and Young 615

Horizontal section of midrib and pinnae, x)8, showing two ranges of zooeeia in both. Carboniferous shales, Scotland.

Fig. 3. PlNNATOPOBA BETBOFLEXA Y. & Y 615

Horizontal section ol midiib and pinna'. x!8, showing the lozenge- shaped zooeeia and their peculiar arrangement In the midrib. Carboniferous shales, Scotland.

Fit,'. 4. PlNNATOPOBA LAIA Y. & Y 615

4. Horizontal section, xlS, showing a uniserial arrangement of the zooeeia

in both the midrib and pinnse. 4 a. A deeper portion of same section where it passes through the basal

liiyer.

Carboniferous shales, Scotland.

Fig. 5. PINNATOPOBA CONFEBTA Ulrioh. (See also PI. LXVI.) 618

Horizontal section, x!8. shewing the large biserially arranged zooscia

in the midrib.

Keokuk group, Bentonsport. Iowa.

Fig. 6. PINNATOPOBA TBILINEATA (Meek) 62*

Horizontal section, x!8, showing the midrib with several pinnae and the base of a lateral branch. The hemisapta are better developed in this species than in any other of this family. Coal Measures, Springfield, III.

Figs. 7 an 1 8. SEPTOPOBA SUBQUADKANS, Ulr. (See also PI. LXIV.) 629

7. Horizontal section, x!8. The branches are closer together than usual.

8. Horizontal section of another branch, x!8.

Chester group, Chester, III.

Plate LVI— Continued.

PAGE.

Fig. 9. SEPTOPORA KOBUSTA Ulr. (See also PI. LXIV.) 633

9. Horizontal section, x!8.

9 a. Transverse section of a branch with dissepiment. x!8.

9 b. Transverse section of a branch, x!8.

9 c. Vertical section of a branch, x 18. showing nearly direct zocecia and the

thin interspaces.

Upper Coal Measures of Illinois.

Fig. 10. SEPTOPORA ROBUSTA var. INTERMEDIA. (See also PI. LXIV.) 634

Horizontal section, x21, showing long uniting pinnte or dissepi- ments. Chester group, Litohfleld, Ky.

Fig. 11. SEPTOPORA BISERIALIS Swallow '• 631

Horizontal section, x!8. showing the doited interspaces and accesssory

pores.

Upper Coal Measures, Kansas City, Mo.

lllir-.-«| ll(..;

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VOL VII!

f Acanthocladiidae.i

PL. LVI.

A.H.Worthen.dtrext.

ThaKreb's Lith.I'o. 5ci<uitt)ic Eub.Cin O.

PLATK LVII.

fill I)/ PAGB.

Fig. 1. HEMITRTPA PROUTASA Ulr 560

1. Celluliferous surface, with superficial net work. x9.

1 a. Non-celluliferous surface of an average example. x9.

1 b. Vertical section of branch ami superficial network, x!8. Slightly oblique.

1 c. Transverse section of several branches and superficial network, x!8.

The branch on the right is about to bifurcate. Warsaw be Is, Warsaw, 111. E. O. Ulrich's collection.

.O'MHiM'Xl-f lo -jrajy -isi* luuijRK .f Fig. 2. HEMITRTPA PHOUTANA var. NODULOSA Ulr i'l.-ii.!Jiu..-i.»»., <v.Ui 562

2. Superficial net-work. x9, showing the floriform interstice.

2 a. Celluliferous face of branches, x9.

2 6. Non-collullferous face of branches, x9, showing the small nodes, and

the relative size of branches and fenestrules. 2 c. Thin section showing structure of zoarium just beneath the zooocia.xlS.

Keokuk group, Keokuk, Iowa.

E. O. Ulrich's collection.

Fig. 3. HEMITBYP A NODOSA Ulr 562

3. Non-celluliferous face of branches, x9. showing nodose character of

branches.

Keokuk group. Bentonsport. Iowa.

Illinois State Museum.

Fig. 3 a. HEMITRTPA ASPERA ? Ulr 563

Portion of the reverse ofa frond where the nodes are on the branches

instead of the dissepiments, x9. On other parts they occupy the usual

position.

Keokuk group, Nauvoo, III.

E. O. Ulrich's co'lection.

Fig. 4. HEMITEYPA ASPERA Ulr 563

4. The reverse aspect of the basal portion of a frond. Natural size.

4 a. Obverse side of same, x9, showing the character of the superficial net- work.

4 6. Reverse side of same, x9, showing the thick branches and dissepi- ments and the subcircular fenestrules. Keokuk group, Beutonsport, Iowa. Illinois State Museum.

4 c. Superficial net-work of another example. Keokuk group. Nauvoo, 111. E. O. Ulrich's collection.

4 d. Non-celluliferous side of same, x9.

4 e and 4/. Thin sections showing structure of the cortical or reverse side of the branches, x!8.

Plate LVII— Continued.

PAGE.

Fig. 5. HEMITBTPA PBOUTANA var. VEBMIFEBA Ulr 561

5. Small portion, natural size, of a large specimen, showing the vermiform

tubes on the reverse side of the zoarium.

5 a. Portion of same, x9, show ng several of the tubular bodies

Warsaw beds, Warsaw, 111. Illinois State Museum.

Fig. 6. HEMITBYPA PEBSTBIATA Ulr 564

6. Reverse aspect of a specimen, x9, showing the relative size of the branches

and fenestrules, the depressed d ssepiments and the strong striae and spines. The latter are often stronger than here represented.

6 a. This section showing structure of zoarium at different levels, x!8.

Keokuk group, Bentonsport, Iowa. Illinois State Museum.

Pig. 7. HEMITBYPA PATEBIFOBMIS Ulr S64

7. Natural size view of specimen.

7 a. Obverse or upper face, x9, showing character of superficial net- work.

7 6. Portion of the non-celluliferous or lower side of eame about midwar

between the base and outer margin, x9. 7 o. Thin faction showing structure of zoarium at different levels, x!8.

Keokuk group, Keokuk. Iowa.

E. O. Uli ion's collection.

.IfHfii .tin. .

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VOL VIII.

} Low Carb Bryozoa .

PL LVII

2o,

' ,-< C.S del

A.H.Worthen,dirext.

The Krebs Lith.Jo. Scientific Put>. Cirx.O.

7,1

PLATE LVIII.

.

PAGE.

Fig. 1. LYROPOBA BANOSCULUM Ulr 881

1. The obverse side of a large specimen showing the basal portion of the

support and a small portion of the net -work. Natural size. The sec- tional view shows the extent to which the margin of the net-work is covered.

1 a. The reverse side of another fragment of the support showing the usual prominence of the basal part, natural size.

1 1>. Obverse face of a branch showing the rather irregular arrangement of the zooecia and tubercles, x!8.

1 c. Reverse face of a frond, x9, showing the subcircular fenestrules, and

the flne vermicular markings of the surface.

Fig. 2. LYBOPOKA SUBQU ADR ANS Hall 582

2. A specimen showing the attenuated base, natural size. This example is

unusually strong. Chester, Illinois. E. O. Ulrich's collection.

2 a. The obverse side of a younger example, preserving a large portion of

the fenestrated expansion. Natural size.

Chester, Illinois.

Illinois State Museum. 2 6. Another example, similar to flg. 2, but not plicated. Natural size.

Chester group, Sloan's Valley, Ky.

E. O. Ulrich's collection. 2 o. Portion of flg. 2 a, showing the relative size and cliara-ter of the

branches and fenestrules, x9. 2 d. Portion of the obverse face, x9.

2 e. One branch of flg. 2 d, x!8, to show the arrangement of the zooBCia and

row of nodes, and the granulose surface.

Fig. 3. LYBOPOKA QTJINCUNCIALIS Hall. (See also PI. LT) 583

3. The obverse side of the support and a small portion of the fenestrated

expansion. Natural size. Chester, Illinois. Illinois State Museum.

3 a and 3 b. Natural size. Reverse and profile views of another specimen

from the same locality and collection. 3 c (e on plate). Poriferous side of net-work, x9. 3 d. Reverse face of a fragment, x9.

Plate LVIII— Continued.

Fig. 4. LYBOPOBA DIVERGENS Ulr

4 and 4 a. Two specimens of this species, natural size. Ch< ster, Illinois. Illinois State Museum. 4 6. Obverse face, x9, showing two and three ranges of zooecia, and other

peculiarities of the species.

4 c. Portion of the reverse side of a large expansion from Chester. 111., which probably belongs to some other species. x9. In its measure- ments it agrees more closely with L. quincuncialis.

4 d. Eeverse aspect of the frond of a more typical specimen, x9.

Fig: 5. LYBOPORA OVALIS Ulr. (See also PI. LV) ............. MV.iM&A. JWiVi

5. View of the only specimen seen. Natural size.

5 a. Surface of same, x9, showing the characters of the reverse face of the

frond.

5 b. Thin section, x!8, showing two ranges of cells, their large size and structure at different levels. Chester group, Litehfleld, Ky.

PAOE.

594

lo

SK .

E. O. Ulrich's collection.

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v/l .yWijtY «'a«oia

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TJ J1 >,-.!» 698) .U«I

T>d)on« ?o

iv oils -«x .

VOL VIII.

Low Garb Bryozoa .(

PL LVIII.

Zc.

ThaKrebs Lith.Co. Scientific Pub.Cin.O.

A.H .Worthen, dirext .

E.O.U &C.S del et lith.

PLATE LIX.

PAGE

Fig. 1. FENESTHALIA SANCTI-LUDOVIOI var. COMPACTA Ulr 605

1. Poriferous face, x9, showing the four ranges of cells an<l the relative

size of branches and fenestrules. St. Louis group, Elizabethtown. Ky. E. O. Ulrich's collection.

Fig. 2. POLYPOBA BUBLINGTONEXSIS Ulr 587

2. Specimen showing non-poriferous side. Natural size.

2 a. Portion of same, x9.

Burlington limestone, Henderson Co., 111. Illinois State Museum.

Fig. 3. POLYPOK A MAC-COT ANA Ulr 588

3. Small specimen from Keokuk, Iowa, showing poriferous side. Natural

size. 8 a. Portion of same, x9, showing the occasional tubercles.

3 6. Another portion, x!8.

3 c. Portion of a stronger example with stronger tubercles, x9. Nauvoo, 111.

3 d. Tangential section, x!8, shows character of cells at different depths.

Keokuk group.

E. 0. Ulrich's collection.

Fig. 4. POLYPOBA SIMULATKIX Ulr 589

4. Poriferous side of an example, natural size. It is partially covered by a

species of Eridopora,

4 a. Beverse side of a small fragment, natural size, showing the base of one

of the root-like processes.

4 6. Upper extremity of flg. 4, x9, showing the perfect appearance of the

zooeoia apertures. Keokuk group, Nauvoo" 111. E. 0. Ulrich's collection.

Fig. 5. POLYPOBA HALLIANA Prout 587

5. Obverse face of an almost perfect frond, x9, showing the comparatively

large granules which occupy the interspaces.

5 a. Reverse of same, x9, showing the flattened sides of the branches and

other features.

5 b. Thin section, x 18, showing structure of zoarium at different levels. 5 c. Cortical substance as shown in thin sections, x 18.

Keokuk group, Keokuk, Iowa.

Illinois State Museum.

Plate LIX Continued.

PAOB. Fig. 6. POLYPOKA EETBOKSA Ulr ............................................................ 591

6. Obverse surface, x9.

6 a. Portion of same, x!8, showing the obliquely elevated peristomes.

6 b. Reverse face of another example, x9. showing the oval fene.strules and

nodulose branches. 6 c and 6 d. Thin sections showing the structure of the zoarium at differ-

ent levels, x!8.

Eeokuk group, Keokuk, Iowa.

E. O. Ulrich's collection.

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VOL VIII.

) Low Garb Bryozoa .[

PU LIX

TheKrebs Lilh..'o. 3ci»ntific Eub.Cin O.

A.H.Worthen.dirext.

E.O.U&C.S del el tilh.

PLATE LX.

PAGE

Fig. 1. POLYPORA BADIALIS Ulrioh 591

1. Obverse surface, x9.

1 a. Portion of same, x 25, showing some of the zocecia apertures entirely

closed and others with the radial denticles. 1 6. Eeverso, x9. 1 c. Horizontal section, x!8.

1 d. Deep tangential section, x!8, showing structure of basal layer.

Keokuk group. Keokuk, Iowa.

E. O. Ulrioh's collection. ' t

Fig. 2. POLYPOBA VARSOVIENSIS PrOUt 593

2. Perfect obverse surface, x9, showing relative size of branches andfenes-

trules and distribution of zooecia apertures. Some of them preserve the covers.

2 a. Usual appearance of the obverse side, x9. 2 b. Reverse, x9.

Warsaw bods, Warsaw, 111. Illinois State Museum.

Fig. 3. POLYPOBA SPININODATA Ulr 594

Beverse, x9, showing the strong hollow nodes opposite the dissepi- ments.

Warsaw beds, Warsaw, 111. Illinois State Museum.

Fig. 4. POLYPORA BISERIATA Ulr 592

4. Obverse surface, x9, showing opercula and relative size of branches and

fenestrules.

4 a. Obverse side of another example, x9, with zooecia apertures open.

4 1>. Reverse. x9, showing the usual flattening of the branches before bifur- cation.

Warsaw limestone, Monroe Co., 111. Illinois State Museum.

Fig. 5. POLYPOKA COBTICOSA Ulr. (See also PI. LV, and LXI> 596

5, 5 a, 5 6, 5 c. Four specimens, natural size.

Chester group, Chester, III. Illinois State Museum.

Plate LX Continued.

PAQB Fig. 6. POLYPOBA COMPLANATA Ulr 597

6. Obverse face of a nearly perfect frond, showing base, extremely wide

dissepiments, and the small fenestrules. Natural size. 6 a. Surface of same, x9, showing cells in different states of preservation,

and che relative size of branches, fenestrules, and dissepiments. 6 6. Transverse section, x!8, showing flatness of obverse side of branches.

6 c. Vertical section of a branch, x!8, showing strong inferior hemisepta, and

form of zooecia.

Chester group, Chester, 111.

Illinois State Museum.

Pig. 7. POLYPOBA CESTEIENSIS Ulr. (See also PI. LV) 594

7. Natural size view of specimen from near Anna, Union Co., 111.

Illinois State Musecm.

7 a. Upper extremity of same, x9, showing appearance of perfect young

examples. 7 6. Natural size view of specimen from Sloan's Valley, Ky.

E. O. Ulrich's collection. 7 c. Surface of same, x9, showing appearance of branches near base of

fronds.

Fig. 8. POLYPOBA TUBEBCULATA PrOUt 595

Obverse surface, x9, of a worn example of this species. More perfect

specimens since examined show that the tubercles are more numerous

and stronger, and the zooacia apertures with peristomes as at the lower

end of flg. la.

Chester group, Chester, 111.

Illinois State Museum.

VOL. VIII.

) Low Garb. Bryozoa.

PL LX

THF. 4^

B17BESIT7

PLATE LXI.

PAGE. Fig. 1. POLYPOBA COBTICOSA Ulr. (See also PL LV and LX) ........................... 596

Obverse surface of specimen represented by fig. 5, PI. LX, x9. Over the lower half the apertures are covered by a dense deposit,

Fig. 2. POI/YPOBA SPINULIFEBA Ulr ......................................................... 598

2. Obverse, x9, showing the relative size of branches, dissepiments, and

fenestrules, and the distribution of the zooeoia apertures and small tubercles.

2 a. Portion of fig. 2, x!8.

Chester group, Chester, 111. Illinois State Museum.

Fig. 3. POLYPOBA SPINULIFEBA var ......................................................... 599

3. Branch, x!8, showing more prominent peristomes, and only three ranges

of zooecia.

3 a. Reverse of same specimen, x9, showing comparatively thin branches

and subquadrate fenestrules. Upper Coal Measures, Montgomery Co., III. State Museum.

Fig. 4. POLTPOBA SPINULIFEBA var. Ulr ................................................... 599

4. Poriferous surface, x9.

4 a. Reverse, x9, showing rounded and smaller fenestrules than fig. 3 a.

Upper Coal Measures near Bed Oak, Iowa. E. O. Ulrich's collection.

Fig. 5. POLYPOBA APPBOXHIATA Ulr ..................................... ................... 599

5. Reverse, x9.

5 a. Poriferous surface, x9.

Chester group, Litchflekl, Ky. E. O. Ulrich's collection.

Fig. 6. POLYPOBA SUBMAKOINATA Meek .................................................... 602

6. Reverse side of an example, natural size.

6 a. Obverse face of another specimen, natural size.

6 b. Portion of 6 a, x9, showing the typical arrangement of zooeeia and

tubercles.

Upper Coal Measures, Macoupin Co., 111.

Illinois State Museum.

Fig. 7. POLYPOBA DISTINCTA Ulr ............................................................ 603

7. Fragment of this species, showing the obverse side, of the natural size.

7 a. Several branches of same, x9, showing the narrow fenestrules, and

arrangement of zooscia apertures. Upper Coal Measures, Springfield, 111. E. O. Ulrich's collection.

Plate LXI Continued.

PAGE.

Pig. 8. POLYPOBA CBASSA Ulr. (provisional) 60S

8. Natural size view of the only specimen seen.

8 a. Surface of same, x9. The zocecia apertures are obscured in part by

abrasion and by a dense cortical deposit.

Upper Coal Measures, Sugar Creek, Saugamon Co., 111.

Illinois State Museum.

Fig. 9. POLYPOBA NODOOABINATA Ulr tiOl

9. Obverse surface, x9, of a well preserved example.

9 a. Obverse side of another portion of same, x9, where the specimen seems

to have suffered from abrasion.

Upper Coal Measures, Crooked Creek, near C'entralla, 111.

Illinois State Museum.

Pig. 10. POLYPOBA GBACILIS Prout 599

10. Natural size view of an example of this species. The tubercles are

drawn a little too strong. Keokuk group. Illinois State Museum.

10 a. Obverse surface, x9, of a well preserved fragment from King's Moun-

tain, Ky., which shows no tubercles. E. 0. Ulrioh's collection.

VOL VIII.

[Fenegtellidae.]

PL. LXI.

E.O.U. del

A.H .Worthen, dirwtt .

TheKrebs Lith.Cb. Sciantific Eub.Cin.O.

PLATE LXII.

PAGE. Fig. 1. POLYPOBA WHITKI var. INSCULPTA Dlr tfOO-

1. Natural size view of a fragment of this species. 1 a. Surface of same, xS.

1 ft. Branch, x!8, to show the peculiar surface characters. Upper Coal Measures, Springfield, 111. E. O. Ulrich's collection.

Fig. 2. POLYPORA WHITEI UlT WX>'

2. Obverse surface, x!8, showing two and three ranges of zooacia.

Lower Coal Measures, Seville, II1. Illinois State Museum.

Fig. 3. CHAINODICTYON LAXUM var. MINOB Ulr ftM*

3. Reverse aspect, natural size.

3 a. Portion of same, x7, showing the relative size of branches and fenes-

trules, and the curved transverse folds. Lower Coal Measures, Seville, 111. Illinois State Museum.

Fig. 4. THAMNISCUS BAMULOSUS Ulr 610'

4. Two specimens of the natural size.

4 a. Obverse surface, x9, showing the thin dissepiments and the arrange-

ment of the papilliform apertures.

4 l>. Reverse of young example, x!8, showing distinct longitudinal strite.

Chester group, Sloan's Valley, Ky. E. O. Ulrich's collection.

Fig. 5. THAMNISCUS SEVILLENSIS Ulr.* (See also PI. LV) 610'

5. Natural size view of a nearly complete specimen.

5 a. Poriferous surface, x9, showing zooecia apertures in different states of

preservation.

Lower Coal Measures, Seville, III.

Illinois State Museum.

Fig. (i. THAMNISCUS DIVABICANS Ulr 60S

6. Obverse side of an example without dissepiments. Natural size.

6 a. Surface of same, x9.

6 b. Obverse side of a fragment showing natural size, comparatively rigid

branches, and remote dissepiments. 6 c. Reverse side of another specimen.

Keokuk, group, King's Mountain, Ky.

E. O. Ulrich's collection.

'Specimens, recently collected by the author at Seville, show this form to be suffi- ciently distinct from T, ramulosus to entitle it to specific rank.

Plate LXII— Continued:

PAGE.

Tig. 7. THAMNISCUS OCTONAEIUS Ulr 611

7. A perfect frond of the natural size.

7 a. Obverse side, x9, showing the arrangement and form of the zooecia apertures.

7 b. Portion of same, x35, to show more clearly the form of the apertures,

and other features.

Upper Coal Measures, Greenwood Co., Kansas.

Illinois State Museum.

Fi -. 8. THAMNISCUS SCULPTILIS Ulr 008

8. Reverse side of a fragment, xfl.

8 a. Obverse side of a smaller specimen, x9.

8 li. Portion of same, x!8.

Keokuk group, King's Mountain, Ky. E. O. Ulrica's collection.

Fig. 9. THAMNISCUS FUBCILLATUS Ulr 609

9. A specimen of the natural size.

Chester, Illinois. Illinois State Museum.

9 a. Fragment of the natural size, xlg, showing the usual appearance of the

obverse face.

Kaskaskia. 111.

E. O. Ulrich's collection.

Fig. 10. THAMNISCUS DUBIUS (Schlotheim) 606

Id, 10 a. Two specimens of the natural size, both showing dissepiments. Permian. Poesneck, Germany. Keokuk group, King's Mountain, Ky. E. O. Ulrich's collect:on.

Fig. 11. DIPLOPOEA r. i s i , KI \ i , i :- Ulr Ii37

11. Two specimens, natural size, showing mode of branching. 11 a. Poriferous side, slightly obliaue. x!8.

11 b. Reverse aspect, xl8, showing near the upper end the prominence of the peristomes.

11 c. Side view of an imperfest specimen, x!8.

Lower Coal Measures, Seville, 111. Illinois State Museum.

Fig. 12. DIPLOPOEA BIFUKCATA Ulr 637

12. Three specimens, natural size.

12 a. One of them, x9.

Chester group, Chester, 111. Illinois State Museum.

VOL. vm

Low&up.Carb.Bryo-zoa |

PL. LXII.

- « "„•.:.•' ,'»v/ *'', *

E.O'.O.&C.fi del et filh.

A.H.Worthen.dtrext.

Lith.Co. Scianiinc Put.Cin.O.

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PLATE LXIII.

PAGE

Fig. 1. ABCHIMEDES COMMUNIS ulr 573

1. Specimen of the axis, showing the remarkable uniformity of the volu- tions. Natural size.

1 a, 1 b, 1 c. Three fragments of the natural size showing slight variations. 1 d. Two sections, natural size, one of a sinistrally, the other of a dextrally wound example showing the inner portion of fenestrated expansion. Chester group, Sloan's Valley, Ky. E. 0. Ulrich's collection.

'Fig. 2. ABCHIMEDES COMPACTUS Ulr 572

2, 2 a, 2 6, 2 d. Four specimens of the sub-fusiform axis of this species,

natural size, showing slight variations. The last is the youngest

example seen.

2 and 2 a, Sloan's Valley, Ky.

E. O. Ulrich's collection.

2 & and 2 d, Chester, 111.

Illinois State Museum.

2 e. Vertical section of axis, natural size.

Fig. 2 c. ABCHIMEDES iNTEBMEDins Ulr 574

Vertical section of a strong axis, natural size, showing the outline and the sudden outward bend of the fenestrated expansion. Chester group, Chester, 111.

Fig. 3. ABCHIMEDES PBOUTANUS Ulr 576

3, 3 a, 3 b. Three fragments of the axis of this species, natural size, showing

slight variations in size and volutions.

3 c. Vertical section of the strongest axis seen, natural size.

Chester group, Sloan's Valley, Ky. E. O. Ulrich's collection.

Fig. 4. ABCHIMEDES MEEXANUB Hall 578

Three fragments of the axis of this species, showing natural size and extremes in thickness of shaft so far noticed. Chester group, Chester, 111. Illinois State Museum.

Fig. 5. ABCHIMEDES TEBEBBIFOBMIS Ulr 575

5, 5 o, 5 6. Three fragments of the axis, natural size, showing variations due

to age and wearing.

Sloan's Valley, Ky.

E. O. Ulrich's collection. 5 c. Another fragment of the natural size from Chester, 111.

Illinois State Museum.

Plate LXIII— Continued.

. PAGE.

Fig. 6. ARCHIMEDES OWENANUS Hall 570

6. Fragment of the axis showing usual form and size.

Keokuk, Iowa.

Illinois State Museum. 6 a. Strongest fragment seen, natural size.

Keokuk group, 3 miles n. e. of Quincy. 111.

Illinois State Museum. 6 b. Vertical section of large axis, natural size.

6 e. Vertical section of slender axis, natural size, forming unusually long

volutions.

Fig. 7. ABCHIMEDES NEGLIOENS Ulr 569

7. Axis of this species, natural size.

Keokuk, Iowa. Illinois State Museum.

7 o. Vertical section of another example, natural size.

Fig. 8. ARCHIMEDES WOBTHENI Hall , 571

8. Axis of this species, showing the usual peculiarities. Natural size.

8 «. Vertical section of portion of same, natural size.

Warsaw, III.

Illinois State Museum.

Fig. 9. ABCHIMEDES DISTANB Ulr 578

9. !• a. Two fragments of the axis of this species, natural size.

The first from Sloan's Valley, Ky., the second from Litchfleld, Ky. E. 0. Ulrich's collection.

9 6. Specimen from Chester, 111., showing the axis with much of the fenes-

trated expansion. At the lower edge of the latter a new axis is being formed, which, as Is invariably the case, turns in the opposite direc- tion. Illinois State Museum.

Fig. 10. ABCHIMEDES OBANDIS Ulr 569

Vertical section of a small specimen of this species, natural size. Compare with flgs. 6 b and 8 a. Illinois State Museum.

Fig. 11, 11 b. ABCHIMEDES PBOUTANUS var , 576

11. Specimen with much of the fenestrated expansion. Natural size.

Chester, 111.

Illinois State Museum. 11 l>. Natural size view of axis from Sloan's Valley, Ky.

E. O. Ulrich's collection.

These two specimens differ from A. proutanus, chiefly, in forming

longer volutions.

Fig. 11 a, 11 c, 11 d. ABCHIMEDES INVAGINATUS Ulr 575

11 a. A strong axis of this species, natural size. Chester, 111. Illinois State Museum. 11 c, 11 d. Vertical sections of two specimens showing extremes in volutions.

Plate LXIII— -

Fig. 12, . .ARCHIMEDES SWALLOyANUS Hall. .•••••-; .••,-.••• 5>M

12. Large axis of this species but of the usual form. Natural size.

Chester, 111.

Illinois State Museum.

12 a, 12 6. Two specimens of a form having the shaft straighter than usual. 12 c, 12 d. Two vertical sections.

Chester, 111.

Illinois State Museum.

Fig. 13. ARCHIMEDES PEBMINIMUS Ulr _ 572

The small specimen shown on fig. 11, x6.

Chester, 111.

Illinois State Museum.

Fig. 14. ARCHIMEDES SUBLAXUS Ulr 579

The type specimen of this species, of the natural size, showing the lax volutions of two axes, one of them sinistral, the other dextral. . Chester, 111. Illinois State Museum.

Fig. 15. ABCHIMEDES LAXUS Hall 580

15. Fragment of the axis, showing nearly two complete volutions.

Litehfleld. Ky.

E. O. Ulrica's collection.

The same specimen is the type of Prof. Claypole's Helico: ora archi-

mediformis. 15 a. Another fragment of this species from the same locality and collection.

Both natural zize.

VOL. vii i.

Archimedes

PL. LXIII.

E.O.U.&C.S del et hth.

A.H.Worthan,dirext.

ThaKrebe Lith.Cc;. Scientific Hil. '

PLATE LXIV.

PAGE.

Fig. 1. HEPTOPORA CESTBIENSIS Prout 628

1. Obverse face, x9, showing the rounded fenestrules and few zooecia on

the dissepiments.

1 a. Branch of same specimen, x!8, showing accessory pores and some of the apertures closed with opercula-like plates.

1 b. Beverse face of another frond, x9.

Chester. 111.

Illinois State Museum.

Fig. 2. SEPTOPOBA SUBQUADRANS Ulr. (See also PI. LVD 620

2. Obverse face of a frond of this species, natural size.

2 a. Portion of same, x9, showing the old state slightly abraded. 2 6. Beverse of another frond, x9.

2 c. Obverse side of two branches, x9, showing a less mature condition

than in flg. 2 a.

Sloan's Valley, Ky.

E. 0. Ulrich's collection.

Fig. 8. SEPTOPOBA ROBUSTA Ulr. (See also PI. LVI) 633

3. Beverse aspect of a frond of this species, natural size.

Upper Coal Measures, Fayette, Co., 111. Illinois State Museum.

3 a. Surface of same, x9, showing the strong branches and numerous acces-

sory pores.

Fig. 4. SEPTOPOBA BOBUSTA var. INTERMEDIA Ulr. (See also PI. LVI) 634

4. Obverse face of a frond, x9, showing the large zooecia apertures.

4 a. Beverse side of another specimen, x».

Chester group, Sloan's Valley, Ky. E. 0. Ulrich's collection.

Fig. 5. SEPTOPOBA DELICATULA Ulr 634

5. A frond of the natural size.

5 a. Portion of same, x9.

Lower Coal Measures, Seville, 111. Illinois State Museum.

Plate LX1.V— L

PAGE.

Fig. 6. SEPTOPOBA BISEBALIS var. NEBVATA Ulr 632

A frond of the natural size, showing the stronger and thinner branches and the somewhat pinnate arrangement of the latter. Upper Coal Measures, Montgomery Co., 111. Illinois State Museum.

Fig. 7. SEPTOPOBA PINNATA Ulr. (See also PI. LXV) ffi»

The reverse aspect of a frond of this species, natural size. Upper Coal Measures, Jasper Co., 111. Illinois State Museum.

VOL.. VIM.

( Acanthocladiidae.]

PL. LXIV.

*'rW*i^ftfi?

A v: ::.:••;*. V;: : »:•.«... ». •• ». ...

E-O.U". del

A.H .Worthen, dir-ext.

Ihe Kreoe Mtn.vO. ftcisnlific Paib.Cin.O.

PLATE LXV.

PAGE.

Fig. 1. SEPTOPOBA PINNATA Ulr. (See also PI. LXIV) 633

1. Obverse side of a branch and several pinnae, x9, showing the arrangement of the zocecia apertures and tubercles.

1 a. Portion of flg. 7, on PI. LXIV, x9, showing the characters of the reverse.

Fig. 2. ACANTHOOLADIA FBUTICOSA Ulr 635

2. Obverse side of a frond, natural size.

2 a. Reverse side of several fronds belonging to the same zoarium as flg. 2. 2 6. Portion of flg. 2, x9, showing the arrangement of the zooecia and the

accessory pores.

2 c. Portion of flg. 2 a, x9. showing the flne stria) and submarginal row of

accessory pores.

Upper Coal Measures, Springfield, 111.

Illinois State Museum.

Fig. 3. PTILOPOBA PBOUTI Hall 625

3. Obverse face of a small frond, natural size.

3 a. Reverse side of another example, natural size.

3 6, 3 o. Portions of the two faces of 3 a, x9. The bifurcation of a branch so

near the midrib is an unusual feature. Warsaw beds, Monroe Co., 111. Illinois State Museum.

Fig. 4. PTILOPOBA ACUTA Ulr 622

4. Portion of a frond, natural size, showing the acute angle at which the

branches are given off from the midrib.

4 a. Obverse face of same, x9,

Keokuk group, Bentonsport, Iowa. Illinois State Museum.

Fig. 5. PTTLOPOKA VALIDA Ulr 623

5. Reverse side of a frond, natural size, showing the full length of the

branches. Enlarged on PI. LXVI.

5 a. Obverse face of midrib, with several branches, of the natural size. The

same is magnified on PI. LXVI.

5 b. Midrib with large branch, natural size, showing the appearance of the zoarium, when, as is usually the case, the lateral branches are broken away.

Keokuk group, Bentonsport, Iowa. Illinois State Museum.

Plate LXV— Continued.

PAGE.

Fig. 5 c. PTILOPOBA sp.

The basal part of a strong midrib that appears to be bifurcate. Inves- tigation shows that this is not so. The branches had been broken away during life, as the cicatrices are in most places covered with a thick deposit of calcareous material. The little fragment of net-work remaining on the left side shows thick dissepiments and somewhat flexuous branches, two features in which it agrees with P. acuta. The acute angle at which the branches arise also point to that species. Illinois State Museum.

Fig. 6. SPHBAGIOPOBA PABASITICA Ulr 638

•3i< 6. Two specimens attached to the shell of Athyris subtilita Hall, x!8. They

represent at the same tiino the largest and the smallest seen. 6 a. Specimen of the average size, x!8, growing upon the support of Lyro- pora subnuadrans Hall. It shows the usua! appearance of tho Chester .•« form.

Chester, 111.

E. O. Ulrich's collection.

SSI)

9tfl ft

Ilirt »iU -..

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VOL. vi n.

[Acanthocladiidae.

PL LXV

K C C &C-S ^el el iilh.

A.H .Worihan.direxl

h.Co. Scientiac fiub.Cin.O

LMATE LXVI.

PAGE

Fig. 1. PTILOPOBA VALIDA Ulr. (See also PI. LXV,) 623

1. Beverse, x9, showing full length of branches on the left side.

1 a. Obverse sid<> of a specimen preserving a small number of branches, x9. The zooecia apertures on the midrib are covered by a calcareous deposit.

1 I. Upper portion of same fragment, x9.

Fig. 2. PTLLOPOKA CYLINDBACEA Ulr 623

2. Obverse side of an example that preserves some of the branches, natural

size, and x9. The magnified view shows the perfect condition. On old examples the rounded ridge of the midrib is less distinct. Keokuk group. King's Mountain, Ky. E. O. Ulrieh's collection.

2 a. Reverse of an example from Bentonsport, Iowa. x9.

Illinois State Museum. 2 6. Side view of midrib of flg. 2, x9.

Fig. 3. PlNNATOPOKA YOUNOI Ulr 615

Natural size, and portion x!8. King's Mountain, Ky. E. O. Ulrieh's collection.

Fig. 4. PlNNATOPOBA FLEXUOSA Ulr 617

4. A fragment of the natural size, with a portion, x!8, showing the charac- ters of the obverse face.

4 o, Small fragment showing the striated reverse side, with the accessory pores, and, where abraded, the uniserial arrangement of the zooecia in the pinna.

4 b, 4 c. Two fragments of the natural size. King's Mountain, Ky. E. 0. Ulrich's collection.

Fig. 4 d. PlNNATOPOKA STBIATA Ulr Wl?

A specimen of the natural size. This was at first supposed to be the same as P. flexuosa, but thin sections, prepared subsequently to the printing of the plates, prove it quite different. Keokuk group, Bentonsport, Iowa. Illinois State Museum.

Plate LXVI— Continued.

PAGE. Fig. 5. PlNNATOPOBA VINEI Ulr 616

5. Natural size view of two fronds as they lay in the matrix. 5 a, 5 6. Obverse and reverse sides, x!8.

King's Mountain, Ky.

E. 0. Ulrich's collection.

Fig. 6. PlNNATOPOBA CONFEETA Ulr 618

A fragment of the natural size, with a portion, x9, showing the charac- ters of the obverse face when slightly abraded. Keokuk, Iowa. E. O. Ulrich's collection.

Fig. 7. PlNNATOPOKA TENUIBAMOSA Ulr -...3ia,lil»

Reverse side of the best specimen seen, showing the natural size and the unusually long delicate pinnae. Wavorly group, Kichfleld, Ohio. Illinois State Museum.

Fig. 8. PlNNATOPOBA BELLtTLA Ulr :.*;:!, 1119

8. Reverse side of a fragment, natural size, and x9. 8 a. Obverse side of another specimen, x!8.

8 b. Portion of flg. 8, x!8, to show the granulose character of the longitudi-

nal striee.

Lower Coal Measures, Seville, 111.

Illinois State Museum.

Fig. 9. SEPTOPOBA DECIPIENS Ulr i£W

9. Obverse side of branch of this species, natural size, and x9. On the latu i

the zooecia apertures are drawn too small, and the small accessory pores, which had not then been detected, are not shown.

9 o. Obverse side of another fragment, doubtfully referred to tlrN species.

Natural ?ize, and x9.

Chester group. Sloan's Valley, Ky.

E. O. Ulrich's collection.

Fig. 10. PTILOPOBA PAUPEBA Ulr 621

Three specimens of the natural size, the central one doubtfully re- ferred to this spci-i,.>. King's Mountain, Ky. E. O. Ulrich's collection.

VOL VIII.

I Acanthocladiidae.l

PL LXVI.

Afort ti

ThaKrebe Lith.Co. Scientific Puh.Cin.O.

M-.IM

•c!'J /

PLATE LXVII.

PAGE Fig. 1. TZNIODICTYA BAMULOSA Ulr ......................................... 52g

1. Specimen split through center. showing natural size and mode of branch-

ing. •

Keokuk group, Warsaw, 111.

Illinois State Museum.

1 a and 1 /. Two specimens, natural size, showing the spreading base. 1 b. Central portion of surface of 1 a, x!8. 1 c and 1 d. Fragment of the natural size, and a portion x9. 1 e. Marginal portion of 1 «, x!8. 1 g. Fragment, natural size. 1 i. Tangential section, x25, showing characters of frond just beneath the

surface,

1 j. Portion of 1 i, x50. 1 k. Deep tangential section, x25, showing thin hemisepta crossing the

zooecia. A section since prepared shows that the minutely dotted struc-

ture shown in the walls also pertains to the median laminiB.

1 (. Vertical section, x25, showing form of zooecia. In a better section,

lately prepared, the inferior hemisoptum is well developed. Keokuk group, Nauvoo, 111. E. 0. Ulrich's collection.

Fig. 2. T.BNIODICTYA BAMULOSA V3T. BURLINOTONENSIS Ulr ............................. 529

2. Specimen of the natural size. At the lower end the zoarium is twisted

so that it appears to taper.

2 a. Surface of same, xlS.

2 6. A reticulated example, referred with doubt to this variety. Natural size.

Burlington limestone, Burlington, Iowa. Illinois State Museum.

Fig. 3. TJENIODICTYA CINOULATA Ulr ....................................................... 530

3. Specimen split through the center, showing natural size and mode of

growth.

Keokuk limestone, Warsaw, 111.

Illinois State Museum.

3 re. Tangential section x'25, showing structure of frond just below the sur-

face. The transversely lined region extends all around the zooecia, differing in that respect from T. ramulosa, (see flg. 1 i.) 3 6. Portion of same section, x50, showing different form of zocecia.

Plate LXVII— Continued.

PAGE. Fig. 4. T.SNIODICTYA SUBBECTA Ulr 630

4 and 4 a. Specimen of this species, natural size, and portion x9.

4 6. The central ranges of zooecia apertures, x!8.

4 c. Casts of zooecia, x!8, showing strong constriction anteriorly due to the

superior hemiseptum. 4 d. Casts of marginal zooecia, x!8.

St. Louis group, Elizabethtown, Ky.

E. O. Ulrica's collection.

Fig. 5. T.ZNIODICTYA FBONDOSA Ulr. (See also PI. LXIX.)

Fragment of the zoarium of this species, natural size. Illinois State Museum.

VIM. rHrerctf nfflnrftrct. sarerCTrcsy nrffprminByfyTig,.

) Low Garb Bryozoa .(

PL. LXVII.

E.O.U. del

A.HWorthen.dirext.

TheKrebs Lith.Co. ScianKfic Eilh.Cin 0.

PLATE LXVIII.

PAGE. Fig. 1. WOBTHENOPOKA SPINOSA Ulr 669

1. Several branches, natural size, as they lay upon a Blab.

Keokuk group, Bentonsport, Iowa.

Illinois State Museum. 1 a. A very perfect fragment of the natural size.

Warsaw beds, Warsaw. 111.

Illinois State Museum. 1 h. Portion of 1 a, x9, showing arrangement of zooecia and the spinose

margins.

1 e. Portion of same, x28. 1 d. Deep tangential section, x28.

1 e. Half of a transverse section, x28; taken from a young example. 1 /. Transverse section of an old example in which the exterior of the

zooecia is much thickened by laminated deposits, x2».

1 g. Vertical section. X28. This probably belongs to the next species.

Fig. 2. WOKTHENOPOBA 8PATUI/ATA PrOUt 870

2 and 2 a. Fragment of the natural size, and a portion, x28.

Warsaw beds. Warsaw. Ill E. O. Ulrich's collection.

Fig. 3. CTOLOPOBA FUNGIA Prout 671

3. Surface of a specimen from Nauvoo, 111., x9.

E. O. Ulrich's collection. S a. Portion of fig. 3, x!8. This figure should be turned so that the right

side is above. In this specimen the interspaces are oblong-quadrate.

3 b. Another portion of flg. :!. x!8, showing part of one of the ma ulae.

3 c. Tangential section, x28, showing structure and form of zocecia at differ- ent levels, the lower portion being nearest the surface. Warsaw beds, Warsaw, 111.

3 d and 3 e. Two portions of another tangential section, x28 and 50, In which the walls are transversely lined and the interspaces of different form than in figs. 3 and 3 a. Warsaw beds.

3/. Vertical section, x28, showing the zocecia of a specimen of medium thickness throughout their length.

.3 (7. Very small upper portion of a vertical section, x28, showing more numerous stages in the mesopores.

Phite LXVIII— Continued.

PAGE.

Fig. 4. CYCLOPOBA EXPATIATA Ulr C73

4. Tangential section, x28, showing the acanthopores and an irregular ar- rangement of the zooacia and mesopores.

4 a. Several zooecia of a tangential section, x50, arranged as in C. fungia. 4 b. Tangential section. x28, embracing one of the maculae. 4 c. Portion of flg. 4, x50.

4 ii, A zoecium with inflected walls, xSO.

Warsaw beds, Warsaw, 111.

E. O. TJlrieh's collection.

.TIT' /. .1 .'II /.i I I

Fig. 5. STICTOPOREI/LA? BASALIS Ulr. (See also PI. LXIX and LXXV) 532

5 and 5 a. Two portions of a tancential section, x50, showing structure of

zoarium just beneath the surface. Keokuk group, Warsaw, 111. Illinois State Museum.

.MI

,3H'i- :i: i»ti:fl

'"-.Ofii'i? ill) J/ni; ftrvnox Vi

VOL. VII

Low. Garb. Bryozoa '

PL. LXVIII.

.^ientific Pub.Cir. 0.

-it -.ill to trtutnniK ulfuwii »il« naiworia ,«£ 7,

PLATE LXIX.

PAGE-.

Fig. 1. CYCLOPOBELLA SPINIFEBA Ulr ...................................................... 675

1. Under surface of a specimen, natural size.

Keokuk group, Warsaw, Illinois. Illinois State Museum.

1 a and 1 6. Two portions of a tangential section, x28, one with a macula. The hemisepta which may be seen in nearly all the zooecia cavities are not represented. The acanthopores are also not distinct enough. They are nearly as conspicuous at this magnification as in flg. 3 a.

1 c. Portions of two vertical sections, x!8, showing the strong acanthopores

and superior homisepta. ,

Fig, a. STICTOPOBEXLA? BASALIS Ulr. (See also PI. LXVII1, and LXXV) ............. 532

2. The erect portion of a zoarium split through the center so as to expose

the surface of the median lamina; natural size. Keokuk limestone, Warsaw, 111. Illinois State Museum.

2 a. Vertical section of same, x!8. The lower portion of the tubular zooacia

is incorrectly drawn. (See plate LXXV.)

Fig. 3. CYCLOPOBEIJjA? PEBVEBSA Ulr ..................................................... 676

3. Tangential section, x!8, showing the usual appearance.

3 a. Portion of same, x50. The acanthopores are more numerous and

stronger than usual.

3 6. Vertical section of a parasitic example, x!8. The transversely lined

body entering the section from the right represents one of the project- ing surface lamellae of the lamellibranch shell upon which it grew.

Fig. 4. PBOUTELLA DISCOID EA Prout ....................................................... 674

4. The under side of a specimen, natural size.

Keokuk group, Warsaw, 111. Illinois State Museum.

4 a. Upper side of a fragment, natural size. The cell apertures should

have been drawn in diagonally intersecting rows.

Nauvoo, 111.

E. 0. Ulrich's collection.

4 6. Surface of 4 a, x9, showing usual arrangement of cells. 4 c. Portion of same, x!8. The thin cell front and the true orifice, are not

shown, having first been discovered, after the plates were printed. 4 d. Thin section, x28. The anteriorly perfoi ated diaphragms, which are

dimly shown in this section, are not represented in the drawing.

Plate LXIX— Continued.

PAGE.

Tig. 5. T.ENIODICTYA FBONDOSA Ulr. (See also PL LXVII) .............................. 529

5. Nearly complete frond, with large expanded base, showing natural size

and irregular distribution of faint monticules.

Keokuk, Iowa.

E. O. Ulrich's collection. 5 a. Surface of same, x9, showing the usual appearance.

Several cells of same, x28, where the interspaces appear unworn.

5 6. 5 c.

Tangential section, x 28, showing the peculiar structure of the walls near the surface.

Fig. 6.

(via

STICTOPOBELLA? UNDULATA Ulr .................................................... 533

6. Incomplete frond of this species, natural size.

Chester group, Litchfleld. Ky.

E. O. Ulrich's collection,

60. Surface of same, x9. showing arrangement of zooecia apertuies. 6 l>. Small portion of surface, x28, showing sloping area around the aper-

tures of both zooecia and mesopores.

8*»iJly«o Bi-i-i«>s orfj I

tuniiRifi lull twin •••

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PL. LXIX.

E.O.U del

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PLATE LXX.

PAOE.

Fig. 1. RHOMBOPORA NICKLESI Ulr 661

1. Fragment of the natural size and x!2.

1 a. Portion of another example, x!2.

1 li. A very slender branched fragment, x!2. The enlargement of these three fragments is not sufficient to permit of representing the row of minute granules on each side of the summit of the interspaces.

1 r. Two fragments of medium size.

Upper Coal Measures, Sparta, 111. E. O. Ulrich's collection.

Fig. 2. KHOMBOPOKA TABULATA Ulr <>58

2 and 2 a. Two fragments, showing natural size and mode of branching.

Chester group, Kaskaskia, 111.

T.ie first belongs lo the Illinois State Museum, the other to E. ().

Ulrich's collection.

2 b. Surface of 2 n, x!2, Showing the usual appearances. 2 p. Vertical section, x!8, showing the diaphragms in the axial region and

other peculiarities of the species.

Fig. 3. EHOMBOPORA PERSIMILIS? Ulr 659

Fragment of the natural size and x!2, slightly abraded. This specimen is stronger than usual, and is referred to the species with some doubt. Chester, 111. E. O. Ulrich's collection.

Fig. 4. RHOMBOPOKA MINOR Ulr 659

4. Three fragments of the natural size, with parts of two of them x!2. The

one to the right is the strongest seen, the others of medium size. Chester group, Sloan's Valley, Ky. E. 0. Ulrich's collection.

4 a. Vertical section, x!8.

Fig. 5. ACANTHOCLEMA CONFLUENS Ulr 662

5. Flattened example of the natural size.

Keokuk group, Nauvoo, 111. E. O. Ulrich's collection.

5 a and 5 b. Surface of same, x!2 and 24, showing an aTaneement of zooecia

apertures and nodes between the flexuous ridges.

Plate LXX— Continued.

PAGE.

Fig. 6. RHOMBOPORA ANGUSTATA Ulr 6'2

6. Fragment of the natural siz°. anil a portion x!2. (i a. Another portion of same, x!2.

Keokuk group. King's Mountain. Ky.

E. O. Ulrieh's collection.

Fig. 7. RHOMBOPORA ATTENUATA Ulr 655

Two examples showing natural size, and a portion of one, xli Keokuk group, Warsaw, 111. E. O. Ulrich's collection.

Fig. 8. RHOMBOPORA TENUIRAMA Ulr 660

8 and 8 a. Fragment of the natural size, with portions xl'2 and 24.

8 l>. Branching fragment, natural size, and x24.

Chester group. Kaskaskia, III. E. O. Ulrich's collection.

Fig. 9. RHOMBOPOKA? ASPHRULA Ulr 656

9 and 9 a. Well preserved slender fragment of the natural size, with a por-

tion x!2.

Keokuk group, Nauvoo, III. E. O. Ulrich's collection.

9 /i and 9 e. A stronger example, in the ordinary state of preservation, natural size, and a part of the surface x!2. Keokuk, Iowa. E. O. Ulrich's collection.

9 d and 9 e. Portions of two tangential sections, x!8, showing the irregular

arrangement of zoopcia and acanthopores.

Fig. 10. RHOMBOPOBA EXIGUA Ulr 651

10 and 10 a. An example of the natural size, with two portions of the sur-

face x!2.

Burlington limestone, Burlington, Iowa.

Illinois State Museum.

Fig. 11. RHOMBOPORA GRACILIS Ulr 651

11. Very complete example of the natural size. Burlington limestone, Burlington, Iowa. Illinois State Museum.

11 a. Portion of the surface where the cells are irregularly arranged, x!2.

11 It. Usual appearance of surface, x!2.

Fig. 12. RHOMBOPORA INCKASSATA Ulr 652

12 and 12 a. Two branching fragments, natural size.

Keokuk group. King's Mountain. Ky.

E. O. Ulrich's collection.

12 b. Another fragment of the natural size, and x!2. From the same locality. 12 c. Tangential section, x!8. 12 d. Transverse section, x!8.

Plate LXX Continued.

Fig. 13. RHOMBOPOKA DICHOTOMY Ulr

13. Nearly entire example; natural size.

Burlington limestone, Burlington, Iowa. Illinois State Museum.

13 a. Portion of surface just beneath the first bifurcation, x!2. 13 6. Portion of surface between the third and fourth bifurcations x!2.

I'ACiK.

.. 650

Fig. 14. BACTBOPOBA SIMPLEX Ulr. (See also PL LXXI)

14. Two complete examples, natural size.

Keokuk Group, Warsaw, 111.

E. 0. Ulrich's collection. 14 a. Small slab with a number of specimens; natural size.

Keokuk g^oup, Nauvoo. Ill

E. O. Ulrich's collejtion. 14 b. Surface of well preserved example, x!2.

VOL. vin.

) Rhomb op ora.(

PL. LXX.

1 H ¥

S&>. fcVftfl i

mm

E.O.U &C.S del et hth

ThaKrebe Lith.Co. Scianlific Eub.Cin O

PLATE LXXI.

PAGE

Fig. 1. BHOMBOPORA VARIANS Ulr

] . Strong example of the natu al size.

Kookuk group, Warsaw, III.

Illinois State Museum. 1 re. Surface of same. x!2, showing the appearance about midway between

the base and the first bifurcation. 1 1>. About the same region on tig. lo. x!2. 1 c. A small example from near Plymouth, 111.

Illinois State Museum. 1 d. Upper end of flg. If. x!2. 1 e. Tangential section of old example, x!8, showing structure at different

levels.

1 /. Half of a vertical section. x!8.

Fig. 2. BHOMBOPOBA SIMULATBIX Ulr '>•">'

2. Bather small example, natural size, and a portion x!2.

2 a. The smallest specimen seen, natural size. 2 li. Rather strong fragment, natural *ize.

St. Louis group, Columbia, 111.

E. 0. Ulrich's collection. 2 c. Strongest specimen seen, natural size.

Monroe Co., 111.

Illinois State Museum. 2 d Tangential section, x!8.

2 e A little more than half of a vertical section, x!8, showing several hemi-

septa.

Fig. 3. BHOMBOPOEA DECIPIENS Ulr <*"

3 and 3a. Three specimens showing variations in size and mode of branch-

ing, natural size.

St. Louis group, Monroe Co., III.

Illinois State Museum, 3 b. Surface of an example like flg. 3, x!2. 3 c. About two-thirds of a vertical section, x!8, showing superior hemi-

septa, and peculiai ities in the development of the zooecia. 3 d. Tangential section, x!8, showing thicker walls than usual.

Plate L\\l—rontimiet1.

PAGE.

Fig. 4. RHOMBOPOBA THANSVERSALIS Ulr C^4

4. Fracment of the natural size, showing the transverpe furro vs as they

appear in a fully matured example. Keokuk group, Warsaw, 111. Illinois State Museum. 4 a. Suiface of same, x]2.

4 6. Tangential section, xis.

Fig. 5. RHOMBOPOEA ? SPIRACIS Ulr G56

5. A fragment of this species, natural size, with two portions of its surface

x!2. The interspaces carry granules, which, when the surface is abraded, are represented by small pores.

5 a. Another fragment, x!2. This is abraded and has the zooecia apertures

surrounded by one or two rows of small pores.

5. Small portion of a tangential section, x!8, showing pores of various sizes

in the walls.

5 o. Transverse section, x!8, showing the spiral arrangement of the zooecia about the center.

5 d. Vertical section, x!8. Sections of this kind closely resemble those of

Streblotryjia major. The species may have to be referred to that

genus.

Keokuk group, King's Mountain, Ky.

E. O. Ulrich's collection.

Fig. 6. BACTBOPOBA SIMPLEX Ulr. (See also PI. LXX.) 663

6. Tangential section, x!8, showing the peculiar stellate character of the

acanthopores.

6 a. Small portion of a vertical section, x!8.

Fig. 7. STBEBLOTBYP A SUBSPINOSA Ulr 668

7. Two examples showing natural size and mode of branching.

7 a. Surface of one, x!8.

Chester group, Kaskaskia, 111. Illinois State Museum.

Fig. 8. STREBLOTBYPA MAJOB Ulr. (See also PI. LXXII.) 666

8 and 8 a. Two fragments of the small form of this species.

King's Mountain, Ky.

E. O. Uliich's collection. 8 ft. Surface of fig. 8, xlg. 8 c. Portion of a tangential section, x!8. 8 d. Example of the large form, natural size.

Keokuk group, Nauvoo, 111.

Illinois State Museum.

Plate LXXI— Continued.

PAGE

Tig. 9. STKEBLOTBYPA NICKLESI Ulr 66T

9 and 9 n. Three fragments of the natural size, and the surface of one. x!8. 9 6, Tangential section, x50, showing structure and arrangement of meso-

pores. 9 c. Vertical section, x!8, showing inferior hemisepta and very slender

tubes in the axial region.

Chester group, Ka^kaskia, 111.

E. 0. Ulrich's collection.

Fig. 10. STBEBLOTHYPA DISTINCTA Ulr

10. Fragment natural size, with a portion x!8.

10 <i. Portion of another fragment on which the transverse arrangement of

the zoo3cia apertures pievails. 10 b. Two portions of tangential sections, x!8.

Chester group, Chester, 111.

Illinois State Museum.

669

A.H.Worthen,direxl;. TneKrebs Lith.Jo. Scientific Eub.Cir.

PLATE LXXII.

PAGE.

Fig. I. STREBLOTBYPA MAJOB Ulr. (See also PL LXXI.) 666

1. Transverse section, x!8.

1 a. Vertical section of small example, x!8. It divides the zoarium a little

obliquely.

Fig. 2. STBEBLOTBYPA EADIALIS Ulr 667

2. Surface of a branch of the usual size and appearance, x!2, showing the

minute pores in the posterior half of the hexagonal sloping areas.

2 a. Tangential section, x28. showing structure just beneath the surface.

2 6. Vertical section, x28, showing the small inferior hemisepta and other features of the species.

2 e. Deep tangential section, x28. Along the middle of the figure, the strong

transverse lines or denticles represent the hemisepta, the dimly shaded spaces, with which they alternate, the zooacia walls cut obliquely. Keokuk group, near Nauvoo, 111. Illinois State Museum.

Fig. 3. COELOCONUS GBANOSUS Ulr 665

3. A complete but compressed specimen, natural size.

Chester group, near Anna, 111. Illinois State Mu«eum.

3 a. Another, less complete, natural size and x!2.

3 6. Vertical section, x!8.

Fig. 4. CoELOCOJfus BHOMBICUS Ulr 664

4. Two examples of the natural size, with the lower two-thirds of one x!2.

4 a. Vertical section, x!8, showing much thinner walls and epitheca than

C. granosus.

4 6. Transverse section, x>8. 4 c. Tangential section, xl8.

Fig. 5. ANISOTBYPA SYMMETBICA Ulr 448

An example of this species, natural size, showing arrangement of zooecia apertures and the isolated large cells. Chester group, Sloan's Valley, Ky. E, O. Ulrich's collection.

Plate LXXII— Continued.

PAGB

Fig. 6. ANISOTBYPA FISTULOSA Ulr 448

6. A fragment of the usual size.

6 a. Another fragment broken so as to show the epitheca lining the inner

side of the branches. Natural size.

St. Louis group, Pella, Iowa.

Illinois State Museum. 6 6. Vertical section, x!8, showing the perforated diaphragms and other

features of two layers, and a portion of a third.

6 e. Tangential section. x!8, showing varying thickness of walls, and per-

forated diaphragms.

Fig. 7. ANISOTBYPA BAMULOSA Ulr 449

7 and 7n. Two examples of this species, natural size. The stems are solid

but their surface and tangential sections are much like .1. fistiilosa. St. Louis group, Pella. Iowa. Illinois State Museum.

Fig. 8. STENOPOBA BUDIS Ulr 444

8. An irregular hollow branch of this species, natural size, showing faint monticules and, at the upper end, the thickness of the zoarium.

8 a. Tangential section. x!8, showing acanthopores, several perforated dia-

phragms, and variations in the thickness of the walls.

8 b. Vertical section, x!8, showing two distinct layers of zooacia tubes, their

tabulation, and slightly moniliform characters of the walls. Chester group, Sloan's Valley, Ky, E. 0. Ulrieh's collection.

Fig. 9. ANISOTKYPA SOLID A Ulr 449

9 and 9 a. Two examples of the natural size.

Chester group, Sloan's Valley, Ky.

E. O. Ulrieh's collection.

9 li. Tangential section, x!8. From a Sloan's Valley specimen. 9 c. Small portion of a tangential section. x50, showing structure of walls

very clearly, From a Chester, 111. example. 9 d. Vertical section, x!8, from a Sloan's Valley specimen. In this the

beaded structure of the walls in the peripheral region is more marked,

than in flg. 9 t. 9 e. Vertical section of an old example from Chestor, 111., in which the walls

are only very sligtrly moniliform.

aomasEr aa^c*

PL. LXXII.

Low Garb. Bryozoa .1

H.O U &C 8 del et lim.

A.ri .Worthan.dirext.

Tfi.j Kreos L:cn Jc . Scientific fcub.Cin O.

PLATE LXXIII.

Fig. 1. EVACTINOPORA QUINQUEBADIATA Ulr

View of the upper side of the base of ' a 'small' example! ' natural ' size' ' Burlington limestone. Burlington, Iowa. E. 0. Ulrich's collection.

Fig. 2. EVACTINOPOKA SEXRADIATA Meek and -Worthen 510

2, 2 a and 2 6. Three views of the strong base of an average example of this species, natural size. Burlington limestone, Burlington, Iowa. E. O. Ulrich's collection.

Fig. 3. EVACTINOPOKA RADIATA Meek and Worthen 50!)

3 and 3 a. Basal and lateral views of an example that' preserves several 'of the bifoliate rays entire. Natural size. Keokuk gooup. King's Mountain Ky. E. 0. Ulrich's collection.

Fig. J. EVACTINOPOBA OKANDIS Meek and Worthen 511

A small example of this species appears upon the polished surface of e block of limestone in which it is imbedded. Natural size. The bifoliate rays are out off about 4 cms. «bove the base, Burlington limestone, Montezuma, 111. Illinois State Museum.

Fig. 5. STENOPOBA? SIGNATA Ulr..

. 44o

sripheral portion of a vertical section, x.36, showing the peculiar struc- ture of the walls, two mesopores, and an acanlhopore.

5 a. Tangential section, x!8.

5 b. Portion of 5 a, xss, showing minute dots about the zooecia and acantho- pores, and their arrangement in stellate clusters along the middle of the walls.

Upper Goal Measures, Caseyville, III. Illinois State Museum.

Fig. 6. STENOPORA RAMOSA Ulr 442

6. Tangential section, x!8, showing variations in thickness of walls due to their periodic swellings. Also perforated diaphragms, and the arrange- ment of the acanthopores.

da. Small portion of another tangei.tial section, xoO, showing minute foramina in the perforated diaphragms, and, in ihe walls, what may have been communication pores.

Plate LXXUI— Continued.

6 b. Peripheral portion of a zooe3ia wall of a vertical section. x50. This sec- tion was prepared from the same specimen that furnished fig. (i a. It shows the supposed communication pores, the laminated structure of the walls, and the thick margin of the opening in the diaphragms.

6 c. Vertical section, xis, showing arrangement of diaphragms in the com- paratively narrow "mature" region. Chester group, Sloan's Valley, Ky. E. O. Ulrich's collection.

Fig. 7. STBNOPORA MEEKANA Ulr I4S

7. Vertical section, x!8.

I a. Tangential section, x!8.

Chester group, Chester, 111, Illinois State Museum.

Fig. 8. STENOPOKA CABBONABIA ( Worthen) 445

8. Tangential section, x!8.

8 a. Three tubes of one vertical section, and one wall of another, x!8, show- ing structure of walls in the typical form of the species. Upper Coal Measures, Caseyville, III. Illinois State Museum.

Fig. 9. STENOPOBA CABBONAKIA var. CONFEKTA Ulr 445

9. Tangential section, x!8, showing variations in wall structure, perforated

diaphragms, and strong acanthopores.

II a. Vertical section, x!8, showing the close arrangement of the wall swell-

ings.

Upper Coal Measures, Caseyville, III.

Illinois State Museum.

Fig. 10. STENOPOBA CABBONABIA var. MACULOS A Ulr ... 145

10. Tangential section, x!8, showing one of the macula-, and the large

zooecia about it.

10 a. Peripheral portion of a vertical section, x!8. Same locality and collec- tion as preceding.

£} im:our i^v- r f ; ^

PL. LXXIII.

] Garb Bryozoa

6 -iel et lilh.

A.H.Worthan^iiraxt.

Krebs Lith -'o. Sciantiiic EuL

/r.

PLATE LXXIV.

PAGE.

Fig. 1. STENOPORA AMERICANA Ulr 437

1. Tangential section, x!8, showing extremes of wall thickness.

1 a. Peripheral portion of a vertical section, x!8, showing moniliform char-

acter of walls. To the left a. wall from another section. Keoknk group, Warsaw, 111. Illinois State Museum.

Fig. 2. STENOPOKA EMACIATA Ulr 438

2. Tangential section, x!8, showing extremes in thickness of walls and size

of zooecia.

2 a. Vertical section, x!8, showing faintly moniliform character of walls.

Keokuk group, Warsaw, 111. E. O. Ulrieh's collection.

Fig. 3. STENOPOKA AMEKICANA var. VARSOVIENSIS Ulr 437

3. Peripheral portion of a vertical section, x!8. showing irregular structure

of walls.

3 a. Tangential section, x!8.

Keokuk group, Warsaw, 111. Illinois State Museum.

Fig. 4. STENOPOKA MONTIFEKA Ulr 438

4. Tangential section, x18, showing wall structure and extremes in thickness

of walls.

4 a. Tangential section of explanate form.

4 b. Vertical section, x!8, showing irregular moniliform character of walls.

Keokuk group, Otter Creek, Jersey Co., 111. Illinois State Museum.

Fig. 5. STENOPOKA INTEHCALAKIS Ulr 439

5. Tangential section, x!8, showing the mesopores and other features of

the species.

5 a. Vertical section, x!8, showing the discontinuous mesopores and the ex-

treme paucity of diaphragms. Keokuk group, Warsaw, 111. Illinois State Museum.

Plate LXXIV— Continued.

PAGE.

Fig. 6. STENOPOBA ANGULABIS Ulr 439

6. Tangential section, x!8. showing the thin walls aul large acanthopores.

G a. Vertical section, x!8, of a layer thicker than usual, showing thin walls and absence of diaphragms.

6 b. Another portion of same vertical section, x!8, showing two layers of

zooecia.

Keokuk group, Lagrange, Mo.

Illinois State Museum.

Fjg. 7. STENOPOBA CESTRIENSIS Ulr 442

7. Tangential section, x35, showing the comparatively large cavity of the

Acanthopores.

7 a. Vertical section, x!8.

Chester group, Chester III. Illinois State Museum.

vo L v 1 1 1

'i£UilLU±L£±l£lL iJJOI-yjur ff»*'f f-;f:i%

) Low. Garb Bryozoa 1^

PL LXXIV.

A.H Worthen, dirext .

~* Lith. .'c

PLATE LXXV.

PAGE.

Fig. 1. BATOSTOMELLA SPINULOSA Ulr 434

1, 1 a and 1 l>. Three specimens of the natural size. Chester group, Sloan's Valley, Ky. E. O. Ulrich's collection.

1 c. Surface x!8, showing the sunken interspaces, mesopores, and abund- ant aeanthopores.

1 d. Tangential section, x!8, showing structure of peripheral region of zoarium.

1 e and 1 /. Two vertical sections, x!8, one with, the other without dia-

phragms.

Fig. 2. BATOSTOMELLA ABKUPTA Ulr 435

An example of this species, natural size. Chester group, Sloan's Valley, Ky. Illinois State Museum.

2 a. Another specimen, natural size, from the same locality.

E. 0. Ulrich's collection.

2 6. Surface of tig. 2 a, slightly abraded, x!8. 2 c and 2 d. Well preserved fragment, natural size, with small portion of

surface, x!8.

Sloan's Valley, Ky.

E. O. Ulrich's collection.

2 e. Half of a vertical section, x!8, showing the abrupt thickening of the

walls at the surface.

Fig. 3. BATOSTOMELLA NITIDULA Ulr 436

3. Fragment of the natural size.

Chester, 111.

Illinois State Museum.

3 a. Surface of same, x!8. Over the lower hah* of the figure the zocecia

apertures preserve the perforated diaphragms.

3 l>. Tangential section, x!8, showing distribution of zooecia, mesopores, and

aeanthopores.

Fig. 4. BATOSTOMELLA INTEKSTINCTA Ulr 434

4. Basal expansion with a number of branches broken away. Natural size.

4 a. Surface of same, x!8, showing relative size of zooecia and interspaces

on the explanate portion of the zoarium.

4 b. Irregular branch, natural size.

4 c. Surface of same, x!8, showing smaller zoooeia apertures and more nu- merous mesopores than 4 a.

4 d and 4 e. Tangential and vertical sections of a branch, x!8. St. Louis group, Pella, Iowa. Illinois State Museum.

Plate LXXV— Continued.

PAGE.

Fig. 5. STICTOPOBELLA BASALIS. Ulr. (See also PI. LXVIII and LXIX.) 532

5. Surface of the erect portion of the zoarium near the base, x9. Shows

portions of two of the large maculfe. 5 a. Portion of same, x23, showing the sloping area around the apertures

of both the zooecia and mesopores. 5 l>. Tangential section, x50.

5 c. Portion of a vertical section of the erect frond, x!8, showing the flexu-

ous median lamina, delicate inferior hemisepta. and the tubular form of the primitive portion of the zooecia. Keokuk group, Warsaw, 111. Illinois State Museum.

Fig. 6. LEIOCLEMA GBACILLIMUM Ulr 429

6. Group of stems belonging to one zoarium, natural size.

Keokuk group, Bentonsport, Iowa. Illinois State Museum.

6 (i. Surface of a branch, x9, showing the usual characters of the species.

6 b. Small portion of same, x!8, to show the minute characters more in detail.

Fig. 7. LEIOCLEMA WACHSMUTHI Ulr 428

7. Surface of the expansion, x9. The specimen was collected by Mr. Charles

Wachsmuth from rocks of the Kinderhook group at Marshalltown, Iowa. It is now in the Illinois State Museum.

7 a. Portion of same, x!8.

7 b. Vertical section. xlS, showing tabulation of mesopores and zojecia.

Fig. 8. LEIOCLEMA SUBGLOBOSUM Ulr 428

8. Two views of a split specimen, natural size. Position, locality, and pres-

ent lodgment, same as for flg. 7.

8 a. Vertical section, x!8, showing tabulation of zoa'cia and mesopores.

8 b. Transverse section, x!8. Many of the mesopores appear as though their

diaphragms might have been perforated originally.

Fig. !>. LEIOCLEMA? ABANEUM Ulr 431

9. Surface of an example, x9.

Chester group, Monroe Co., 111. Illinois State Museum.

9 a. Vertical section, x!8.

9 b. Tangential section. x!8.

!i i. Portion of same. x35, showing the numerous minute acanthopores in the zocKcia walls.

VOL.VIII

•-^VvV^V ••• ».• *

«••••••* «

'«*/.«• ?• •,

1 > •-"•:• t ..*.«( * * . : .»..

E.O.U.&C.S del et liHi.

A.H.Worthen.diraxt.

ThaKrebs Lilh.-o. Scientific Eub.Cin D.

PLATE LXXVI.

PAGE

Fig. 1. MEEKOPORA? APEBTA Ulr ..485

1. An example of the natural size, showing the irregular mode of branch-

ing, with a portion of the surface x!i.

1 a. Tangential section, xlH.

Keokuk group, King's Mountain. Ky. E. O. Ulrich's collection.

Fig. 2. CYSTODICTYA PUSTULOSA Ulr 495

2. A. specimen showing its natural size and the arrangement, of the zooecia

apertures.

2 a. Portion of surface of same, x!), showing the papilliform elevation of the

zooecia apertures.

Keokuk group, King's Mountain, Ky.

E. 0. Ulrich's collection.

Fig. s. CYSTODICTYA LINEATA var. MAJOE Ulr 4»5

An example of this variety, natural size. The diagonal arrangement of the zooecia is more conspicuous in the drawing than natural. St. Louis limestone,? Alton, 111. Illinois State Museum.

Fig. 4. CYSTODICTYA NITIDA Ulr 493

4. An example of the natural size, showing its mode of branching. 4 a and 4 1>. Portions of its surface, x9 and 18, showing the fully matured condition of the zoarium.

4 c. Small portion of the surface of another well preserved b it less fully

•matured example, x!8. Keokuk group, Bentonsport, Iowa. Illinois State Museum.

Fig. 5. CYSTODICTYA AMEEICANA Ulr 494

5 and 5 a. Two fragments of the natural size. The zocecia are ranged in

from three to flve rows, and, when magnified, closely resemble those of fig. 4 c.

Fig. 6. MEEKOPOKA CLAUSA Ulr. (See also PL LXXVII) 485

A fragment of this species, showing its natural size and the arrange- ment of the maculse and zooecia. Chester group, Sloan's Valley, Ky. E. 0. Ulrich's collection.

Plate LXXVI— Continued.

PAGE. Fig. 7. COSCIJJIUM LATUM Ulr -W7

7. Natural size view of a specimen that preserves the expande 1 base and a

large part of the perforated frond. Burlington limestone, Henderson Co., 111. II inois State Museum.

7 a and 7 b. Surface of two frogmen's, x9. showing the zooecia apertures

in different stages of development.

Burlington, Iowa.

E. 0. Ulrich's collection.

Fig. 8. DlCHOTEYP A ELEGANS Ulr 51 H)

8. Well preserved silicifled fragment of the natural -'ize.

St. Louis group, Eiizabethtown. Ky. E. O. Ulrich's collection.

8 a. Basal portion of a large specimen, natural size, having all the zooecia

closed by a deposit of solid calcareous tissue, Monroe Co,, III. Illinois State Museum.

8 b. Portion of surface of flg. 8, xl2, showing one of the macula? and sur- rounding zocecia.

8 c. Tangential section, xl8. showing the characters of the zoarium just above the median lamina1.

8 d. Tangential section, xl8, dividing the zooecia just beneath their aper-

tures.

Fig. 9. DlCHOTBYPA INTERMEDIA Ulr 500

9. The most complete example seen, natural size.

9 a. Surface, x!2.

St. Louis limestone. Alton, III.

Illinois State Museum.

9 b. Small portion of a vertical section, xlS. 9 c. Tangential section, x!8, showing well developed lunaria and other

features a short distance beneath the surface.

VOL VIII

PL. LXXVI

} Low Carb Bryozoa .(

.

i

PLATE LXXVII.

PAGE.

Fig. 1. DICHOTRYPA FLABELLUM (Eomtnger) 501

1. The basal portion of a large silicifled example of this species, natural

size.

St. Louis group, Spergen Hill, Ind. Illinois State Museum. 1 a. Surface of same, x9, showing the usual appearance.

1 l>. Surface of a better preserved exami le, x9, showing the striate char-

acter of the interspaces and maculae.

Fig. 2. DICHOTK YPA LYROIDES Ulr 502

2. An example of this species showing the thick rounded base. Natural

size.

2 a. End view of same.

St. Louis group, Southern Ky. E. O. [Jlrich's collection.

2 6. Surface of a well preserved fragment. x9.

Fig. 3. ACTINOTKYPA pEcuuAKis (Kominger) 503

8. Surface of a well preserved example, x9, showing arrangement of zooecia apertures and one of the maculae.

3 a. Small portion of same, xJ8, to show more clearly the tooth-like eleva-

tions of the internal ridges.

3 b. Tangential section. x!8 showing characters of the zoarium a short dis-

tance beneath the surface. Keokuk group, Keokuk, Iowa. E. O. Ulrich's collection.

Fig. 4. PBISMOPORA TKIFOIJA (Bominger) 505

4. Small fragment, natural size. This specimen is thinner than usual.

4 a. About hah* of a more complete and stronger example, natural size.

The lower portions on the left side represents part of the basal ex- pansion. Keokuk, Iowa. Illinois State Museum.

4 6. An example of a wider form, differing further from P. trifotia in hav- ing larger cells and the "dimples'' not extending to the margin. Keokuk, Iowa. E. O. Ulrich's collection.

Fig. 5. MEEKOPOKA APPBOXIMATA Ulr 484

Surface of the thin bifoliate expansion of a specimen of this species,x9. Chester group, Chester, 111. Illinois State Museum.

Plate LXXVII— Continued.

PAGE.

Fig. 6. MEEKOPORA EXIMIA Ulr 483

6. Fragment of this species, natural size, showing distribution of maculfle

and zooeeia. Also view of the left edge, showing the bifoliate charac- ter of the zoarium and the oblique zooecial tubes. Chester group. Monroe Co.. III. Illinois State Museum.

6 a. Surface of same, x9.

6 b. Portion of 6 a, x!8. with (?) ooecium.

6 c. Deep tangential section, x!8, showing faint lunaria and mesopores.

6 rl. Tangential section, x!8, showing structure just beneath the surface.

Fig. 7. MEEKOPOKA CLAUSA Ulr. (See also PI. LXX VI) 485

7. Several zooeeia apertures closed with the perforated opercula, x!8.

7 a. Portion of the surface of a branch, x9.

7 b. Vertical section, x!8, from the flexuous median lamina- to the surface. Shows the vesicular tissue and two zooecial tubes.

Fig. 8. STBOTOPOKA DEKMATA Ulr. •...-. 488

8. Flattened fragment of this species showing distribution of ooecia; nat-

ural size.

Keokuk, Iowa.

E. O. Ulrich's collection.

Fig. 9. STKOTOPOKA FOVEOI.ATA Ulr ..487

9. Small portion of the surface of a large example, natural size, to show

distribution of zooecia and oo3Cia.

9 a. Portion of same, x9, showing rather irregular form of zoo?eia apertures the elevated lunaria and two of the broken ocecial cysts. Keokuk group, Bentonsport. Iowa. Illinois State Museum.

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PLATE LXXVIII.

PAGE.

Fig. 1. PKISMOPOBA MINIMA Ulr 506

1. Two fragments of the natural size.

Upper Coal Measures, Sparta, 111.

E. O. Ulrich's collection. 1 a. One of them, x9, showing the rather irregular arrangement of the

zooecia.

1 b. Transverse section of a branch, x!8, showing its tripartite structure. 1 c. Tangential section, x!8, showing distinct lunaria and other characters

of the zoarium just beneath the surface.

Fig. 2. GLYPTOPORA PINNATA Ulr 516

The only example of the species seen. The drawing shows the pinnate arrangement of the zooecia and maculse. The prominence of the latter is largely accounted for by the abrasion which the frond has suffered. Burlington limestone, Burlington, Iowa. Illinois State Museum.

Fig. 3. GLYPTOPORA PLUMOSA Prout 512

3 and 3 a. Two fragments of this species, natural size, showing the plumose arrangement of the elongate dimples. Warsaw beds, Warsaw, 111. Illinois State Museum.

3 b. A small but well preserved fragment, natural size. Same locality. E. O. Ulrich's collection.

3 c. Portion of 3 b, x9, showing the smooth surface of the dimples and the

usual arrangement of the zotecia apertures.

Fig. 4. GLYPTOPOBA KEYSERLINGI Prout 517

4. Nearly complete leaf or side of a cup of a small, but well preserved ex-

ample of this species, natural size. Keokuk group, Nauvoo, 111. E. O. Ulrich's collection.

4 a. Surface of same, x», showing arrangement of zooecia between the

granulo-striate margin, and one of the dimples.

4 b. Several zooecia apertures of same, x!8, to show their irregular outline

and the pitted interspaces.

Fig. 5. GLYPTOPOKA MEOASTOMA Ulr 518

5. Surface of an example of this species, x9, showing arrangement of the

comparative large sub-circular zoceeia aperture*. Keokuk group, Keokuk, Iowa. E. 0. Ulrich's collection.

5 a. Several apertures of same, x!8.

Plate LXXVIII— Continued.

PAGE.

Fig. ti. GLYPTOPOKA SAGENELLA Prout 513

6 and (i a. Opposite views of a small example of the typical form of this species.

Keokuk group, Bentonsport, Iowa. Illinois State 'Museum.

Fig. 7. GLYPTOPOBA SAGENELLA var. LATA, Ulr 515

Complete example of this variety, natural size. The opposite side is similarly divided into cup-shaped spaces, only where on this side we see the bottom of a cup, the other shows a ridge. Warsaw beds, Warsaw, 111. Illinois State Museum.

Fig. 8. GLYPTOPOKA MICHELINIA Prout 515

8. Cupuliferous surface of an example of this species, natural size.

8 a. Opposite or epitheeal surface of same. The specimen is worn through the epitheca, so that the vertical lamina1 are shown.

8 6. A very small but high example, natural size, showing the faint dim-

ples on the sides of the cups. Warsaw beds, Barrett's Station, Mo. Illinois State Museum.

Fig. 9. GLYPTOPOBA PUNCTIPOKA Ulr 519

9. Surface of a leaf of this species, x9, showing a dimple, and the ar-

rangement of the compressed zooecia apertures.

9 a. Small portion of same, x!8.

Chester group, Monroe Co., 111. Illinois State Museum.

Fig. 10. GLYPTOPORA ELEGANS Prout 518

10. Nearly complete but small example, showing the arrangement of the

leaves into deep cups ; natural size. This figure also serves to illus- trate the mode of growth of G. keyserlingi, G. megastoma and ';. punctipora.

Warsaw beds, Warsaw, 111. Illinois State Museum.

10 a. Surface of another specimen, x!'.

10 b. Portion of same, x!8. showing the zooecia apertures in a good state of preservation,

10 o. Vertical section, x!8. showing several zooecia] tubes throughout their length on both sides of the median lamina.

10 d and 10 e. Two small portions of a tangential section.

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