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MEMOIRS

OF THE

MUSEUM OF COMPARATIVE ZOOLOGY

HARVARD COLLEGE.

EIGHTY-THREE PLATES TO ACCOMPANY.

Volumes XX. and XXL

CAMBRIDGE, U.S.A.
PRINTED FOR THE MUSEUM.
1897.

University Press :

John Wilson and Son, Cambridge, U. S. A.

CONTENTS.

THE NORTH AMERICAN CRINOIDEA CAMERATA. By Charles Wachsmuth and
Frank Springer.

PLATES I. TO LXXXIII.

Together with the accompanying Explanation.

ULmoirs of 1 be JftusMnt of Comprafifce ^odlojjn

AT HARVARD COLLEGE.
Eigiity-Tiiuee Plates to Accompany.

Vols. XX. AND XXL

THE NORTH AMERICAN

CRIAOIDEA CAMERATA.

By CHARLES WACHSMUTH and FRANK SPRINGER.

EIGHTY-THREE PLATES.

CAMBRIDGE, U.S.A.:
Printed for tfje fHusrum,
May, 1897.

PLATES AND EXPLANATION OF THE PLATES.

97264

PLATE I.

Page

ig. 1. A long stem with a finely preserved Root, probably belonging to Poteriocrinics.

From the Burlington Limestone 44

2. Stem with enormous Cirri, probably of Batocrinus yrandis, with large cysts

on two of the cirri. From, the Keokuk group at Crawfordsville .... 43

3. Stem fragment from the Upper Devonian of Kentucky, with five rows of

large cirri, longitudinally arranged 43

4. Terminal end of a Stem, apparently of Barycrinus, attached by a flat surface.

From the Lower Burlington Limestone.
a. Profile view of the same.

b. Surface of attachment of same, showing open grooves passing out from the

axial canal of the stem 46

5. Terminal end of Stem of Barycrinus, showing the large asteriform canal of

stem, and the linear canal of the cirri 46

6. The quinquepartite Stem of a Barycrinus, somewhat weathered, showing the

longitudinal divisions, and two series of pores to each segment .... 46

7. Terminal end of Stem of Barycrinus, showing the large axial canal, with the

laminated structures 46

8a, b. Sections of stem fragments of Barycrinus, showing slits and pores through

the walls 46

9, 10. Dorso-central Plates, supposed to belong to a species of Heterocrimis.

From the Hudson River group at Cincinnati 49, 51

(All specimens are in the collection of Wachsmuth and Springer.)

Crinoidea Camerata.

Plate I.

,v„

J.L.Ridgway del .

Heliotype Printing Cc. Bcstc'n

PLATE II.

Detached Stem Joints of various fossil Crinoids.

. 1 is a joint of Pentacrinus ; fig. 2 of Rhizocrinus. The stem fragment, fig. 3,
belongs to Mespilocrinus ; figs. 5, 8, 9, 11, and 12 to Platycrinus ; fig. 6 to
Teleiocrinus, and fig. 7 to Cactocrinus. The specimen fig. 10, which probably
belongs to an Actinocrinus, shows beautifully the striations at its upper face,
and fig. 13 the connection of the cirrus canal with the stem canal.

4 a and b represent the proximal end of the stem of an Onychocrinus, — 4 b showing
the infrabasals coalesced with the top stem joint (pp. 62, 65).

17 and 38 represent wide nodal joints to which extremely narrow internodal ones
are attached. Figs. 39 to 41 are nodal joints, with or without internodals ;
figs. 42 to 48 nodals, followed by internodals resting wholly or partly between
the projecting margins of the nodals. Traces of new joints occur in figs. 33
and 35. The joints in figs. 14 and 20 probably belong to Megistocrinus Evansi ;
fig. 21 to Periechocrinus Whitei ; figs. 32, 36, and 39 to Cactocrinus ; fig. 40 to
Teleiocrinus ; to the five oval pieces shown by figs. 49 to 53 to Platycrinus.

LIBRARY
•F THE

UNIVERSITY ®f ILLINOIS

Crinoidea Camerata.

Pirate II

A.M.Westergren. del.

Heiiotype Printing Co., Boston.

Crinoidea Camerata.

Plate III.

ChasR Keyes. GLiljevall, AM.Westergreix del.

Heliclype Printing Cc, Boston.

PLATE III.

Tiie Plates surrounding and closing the Peristome.

Page

Fig. la. Cyathocrinus Gilesi W. and Sp. The interradial plates abutting upon the
radials preserved, but those covering the peristome removed. (Coll. W.

and Sp.) 95, 114

lb. Another specimen of the same species, with the interradial plates partly-
covered by small marginal pieces ; — otherwise in the same condition as
fig. la. (Same collection.) 95

2. Cyathocrinus brevisacculus W. and Sp. (Ms.). Showing the disk ambulacra

and the madreporite ; the large interradial plates exposed to view. (The
figure is drawn with the anal side up. Same collection.) .... 96, 114

3. Cyathocrinus nodosus W. and Sp. (Ms.). Like fig. 2 ; but the orals still

more asymmetrical, and the interradial plates covered by marginal pieces.
(Same collection.) 96, 114

4. Cyathocrinus multibrachiatus Hall. Like fig. 3 ; but with the orals

resorbed. (Same collection.) 96, 114

5. Euspirocrinus spiralis Angel. Interradial -plates exposed, very large, en-

closing large covering pieces which close the peristome. (Drawn with
anal side up. Zool. Elks Mus., Stockholm.) 96

6. Cyathocrinus alutaceus Angel. Arrangement of orals as in Platycrinus,

asymmetrical ; surrounded by small perisomic pieces. (Same collection.) 96, 114

7. The same species. The oral apparently in process of resorption. (Drawn

with anal side to the left. Same collection.) 98, 114

8. Cyathocrinus l.evis Angel. The orals partly resorbed. (Drawn with

anal side up. Same collection.) 96, 114

9. Thaumatocrinus renovatus P. H. Carpenter. Having large symmetrical

orals surrounded by perisome. (After Carpenter.) 88

10. The ventral disk of Hyocrinus bethellianus W. Thom. The orals surrounded

by a narrow band of perisome. (After Carpenter.) 88, 99

11. Taxocrinus intermedius W. and Sp. Ventral disk formed of small movable

plates ; the orals consisting of four small plates and a larger one, sepa-
rated by the ambulacra ; the mouth opened out. (Coll. W. and Sp.) 88, 89, 101

12. Haplocrinus mespiliformis Goldf. The orals resting upon the radials.

12a. Posterior side of the oral pyramid.

12 b. Ventral aspect of the same. (Coll. W. and Sp.) 92, 93

13. Myrtillocrinus americanus Hall. Orals as in the preceding genus.

(Amer. Mus. Nat. Hist. New York.) 89

14. Coccocrinus rosaceus F. Eoemer. The orals symmetrical ; separated from

the radials by a single interradial plate. (Coll. W. and Sp.) .... 89, 90

Page

Fig. 15. Idiocrinus ventricosus W. and Sp. The orals represented by an un-
divided disk which is surrounded by hve interradial plates not shown in
the figure. (Same collection.) 205

16. Platycrinus symmetrtcus W. and Sp. The orals almost symmetrical.

(Same collection.) 94, 655

17. Platycrinus discoideus 0. and Sli. The orals more asymmetrical. (Same

collection.) 88, 89, 94, 713

18. Eretmocrinus coronatus (Hall). The orals distinctly asymmetrical. (Same

collection.) 88, 89

19. Talarocrinus decornis W. and Sp. The posterior oral extremely large,

the other four unrepresented. (Same collection.) 88

20. Dorycrinus mississippiensis Shum. The orals unusually asymmetrical.

(Same collection.) 88, 89

21. Eutrochocrinus Ciiristyi Shum. The orals excentric and asymmetrical.

(Same collection.) 88, 89

22. Agaricocrinus Wortiieni F. Roemer. The orals separated from one an-

other by perisomic plates. (Same collection.) 88, 89

23. Marsupiocrinus depressus Angel. The orals quite small and asym-

metrically arranged. (Same collection.) 88, 89

24. Rhodocrinus Whitei Hall. The orals altogether unrepresented. (Same

collection.) 89

25. Symbathocrinus Wachsmuthi M. and W. The orals asymmetrical, and

supported by the upper muscle plates. (Same collection.) 89

(Figures la, 4, 5, 6, 7, 8, and 16 enlarged t ; Figures 2, 3, and 15, f .)

PLATE IV.

Page

. 1. Ventral aspect of the internal cast of a specimen of Teleiocrinus, with sub-

tegminal ambulacra resting against the inner floor (f) 102

2. The same aspect in a natural cast of Physetoorinus ventricosus ip . . dU . 102

3. The same in a cast of Physetocrinus ornatus 102

4. The same in a cast of Strotocrinus regalis 102

5. Internal cast of a Dorycrinus, of which the median part of the ambulacral

skeleton, contrary to the case of the four preceding species, does not touch
the inner floor of the tegmen . 102

6. Cast of a Platycrinus, in which the ambulacra are subtegminal to the arm

bases, being placed at some distance from the inner floor of the disk . . 102

7. Cast of an Eutrochocrinus Christyi, showing impressions of the lining covering

the inner floor of the disk 102

8. Cactocrinus glans, showing fragments of the convoluted (digestive) organ, and

to the left the subtegminal ambulacra of one ray (f) 102

(In the following specimens — Figs. 9 to 17 — a second anal opening is
introduced at various parts of the calyx, the regular aperture having
probably been obstructed.)

9. A specimen of Batocrinus, in which a new opening has been formed between

the basals toward the anterior side 136

10. A specimen of Batocrinus subaegualis, with an abnormal opening directly

above the basals, involving the whole of the right posterior side of the
dorsal cup (slightly enlarged) 136

11. A small specimen of Teleiocrinus umbrosus, with a second tube passing out

from the tegmen 136

12. A Steganocrinus pentagonus, with a second anal tube given off near the base

of the regular one 136

13. A malformed specimen of Eutrochocrinus Christyi, with a second tube formed

above the arm bases 136

14. A Batocrinus laura, with a second tube given off from the base of the origi-

nal one and a third tube apparently in process of formation 135

15. A specimen of Macrocrinus jucunclus, in which a small tube branches from

the regular one 136

16. The anal tube of Eutrochocrinus Christyi with a transverse lateral branch . 135

17. Another tube of the same species bifurcating above the tips of the arms . . 136

18. The base of a Platycrinus, showing irregular, wart-like protuberances, dotted

with small circular pits.

19. A radial plate with similar pits, surrounded by a circular rim.

20. A piece of a column affected in a similar manner.

(All specimens are in the collection of Wachsmuth and Springer, except
that of Fig. 6, which is in the collection of Mr. R. R. Rowley.)

C'RINOIDEA CAMERATA.

Plate IV.

A.M .W e s tergren. 0 . St .John del .

Hello type Printing Co.. Boston.

PLATE V.

The Convoluted Organ, and the structure beneath the Tegmen.

Page

Fig. 1. A specimen of Teleiocrinus, showing the convoluted organ, and portions of the

ambulacral skeleton, both heavily coated with silicious matter (f) . 106, 143

2. The same organ in Cactocrinus, showing the partition which forms the second

convolution, the outer wall being removed 106

3. A Teleiocrinus umbrosus, with the whole convoluted organ intact (slightly en-

larged / 143

4. Another specimen of the same species, exposing the walls forming the third

convolution, the two outer ones removed (slightly enlarged) . . . 106, 143

5. The convoluted organ of an Ayaricocrinus, seen from above 106

6. Cross section of the same organ in a specimen of Batocrinus 106

7. Dorsal aspect of the same organ in a specimen of Macrocrinus verneicilianus . 106

8. Lateral view of the organ in M. verneuilianus ; its upper end surrounded by

an annular vessel 105, 143

9. The convoluted organ in a specimen of Strotocrinus 143

10. Cactocrinus proboscidalis, showing a portion of the ambulacral skeleton, and

the convoluted organ beneath 107

11. Cactocrinus thetis, showing the delicate network of the convoluted organ . . 143

12. Dorsal aspect of the organ in Eutrochocrinus Choistyi (enlarged) .... 143

13. A broken specimen of Dorycrinus, showing the internal lining and covered

galleries along the inner floor of the tegmen 106, 107

14. The inner floor of the tegmen in a Physetocrinus ventricosus 120

15. A broken specimen of Lobocrinus lonyirostris, showing the lining within the

dorsal cup 106

16. The inner floor of the tegmen of a specimen of Teleiocrinus rudis ; heavily

coated with silicious matter 106, 107

17. The inner floor of -Batocrinus inornatus, formed into open galleries for the

reception of the ambulacra 106

(All specimens are in the collection of Wachsmuth and Springer, except
those of Figs. 10, 11, and 15, which are in the Museum of Comparative
Zoology.)

Crinoidea Cambrata

Plate V.

A.M .Westergren . del.

Helictype Printing Co,Boston.

Of THE

Crinoidea Camerata.

Plate VI.

in |i»\

ffljjk, 'S

'

s;Vt' >i/.'

mi

J. L Ridgway del .

Heliotype Priming Co.,Boston.

ID

PLATE VI.

(Figs. 1 to 12 are represented to show the orientation of the stem and axial
canal among Neozoic Crinoids ; tigs. 13 to 20 the close affinities between
the Ichthyocrinidse and Comatulaj.)

Page

Millericrinus Orbignyi de Loriol G1

Fig. la. The crown with a portion of the stem ; the angles of the latter interra-
dially disposed. (After de Loriol ; Crinoides de la France, FI. 116, fig. 1.)

lb. Inner aspect of the base ; the space which is empty in most species of
Millericrinus occupied in this specimen by small infrabasals. (After de
Loriol ; ibid., fig. lc.)

Millericrinus polydactylus de Loriol 61

2a. The infrabasals attached to the truncated upper eud of the stem (lateral
view).

2b. Ventral aspect of the same. (Both after de Loriol ; ibid., PI. 110, figs.
la, 2a.)

Millericrinus icaunensis de Loriol . . ■. 61

3. The dorsal cup with the proximal joint of the stem attached; the angles of
the latter corresponding with the angles of the basals ; the axial canal
quite small. (After de Loriol ; ibid., PI. 61, fig. 5d.)

Millericrinus Milleri d’Orbigny 61

4 a. Ventral aspect of the dorsal cup; the diameter of the open space between
the basals almost as great as that of the whole stem. (After de Loriol ;
ibid., PI. 96, fig. 3.)

4 b. Dorsal aspect of the cup, showing the small size of the axial canal. (Ibid.,
Plate 96, fig. 2a.)

Millericrinus Caraboeufi de Loriol 61

5. Showing in a side view the angularities upon the proximal face of the top

stem joint. Being radially disposed, they conform to the depressions
upon the outer face of the basal disk ; whereas the angles along the sides
of the stem are directed interradially, in accordance with the rule govern-
ing dicyclic Crinoids. (Ibid., PI. 59, fig. Sc.)

Millericrinus munsterianus d’Orbigny 62

6. Top stem joint, showing the angular ridges upon the upper surface. (After

de Loriol ; ibid., PI. 83, fig. 2.)

Page

Riiizocrinus Rawsoni Pourtales 63

Fig. 7 a. Dorsal aspect of the cup; the vacant space between the basals of different
form, and larger than the axial canal of the stem. (After P. H. Carpenter ;
Challenger Rep. on Stalk. Crin., PL X., fig. 5.)

7b. Distal face of a stem joint. {Ibid., fig. 14.)

Pentacrinus asterias W. Thomson G5

8. Dorsal aspect of the cup ; the empty space within the basal ring interradially

disposed. (Carpenter, ibid., PI. XII., fig. 16.)

Metacrinus angulatus P. H. Carpenter 65

9. The space within the basal ring, contrary to preceding figure, radially dis-

posed. (After Carpenter ; ibid., fig. 2.)

Bathycrinus aldrichianus P. H. Carpenter 65

10. Horizontal section of the basal ring. (After Carpenter ; ibid., PI. YIIA

fig. 2.)

11. The infrabasals of Onychocrinus, coalesced with the top stem joint. (Coll.

W. and Sp.) 65

12. Dorsal aspect of the Base of Glyptocrinus decadactylus ; the interradial

outline of the upper stem joint taking its form from the basal concavity.

(Same collection.) 66

13. 14, and 15. Pentacrinoid larvae of Antedon. (After P. II. Carpenter ; Chall.

Rep. on the Comatulce, PI. XIV.) 152

16. A young Taxocrinus from the Burlington Limestone. (Coll. W. and Sp.) 152

17. A young Onychocrinus from the Keokuk Group. (Same collection. ) . . 152

Antedon Rosacea Lamarck 152

18. In its young stage ; the centro-dorsal and succeeding stem joints interradi-

ally disposed, the primary cirri radially. (After W. B. Carpenter ; Philos.
Trans. 1866, PI. XLI.)

19. In its adult state. {Ibid., PI. XXXVIII.)

Onychocrinus Ulrichi S. A. Miller 152

20. In its general structure resembling a young Antedon.

(Figs. 2b, 4a, 7a, 8, 9, 10, 11, 12, 18, are drawn with the interradial side up ;

Figs, lb, 3, 4b, 6, 19, 20 with the radial side up.)

PLATE VII.

Page

Scaphiocrinus elegans W. and Sp. (MS.) 138

Fig. la. Anterior side of the specimen, showing the ventral sac and the anal open-
ing low down in the sac. (Only the lower half of the specimen is drawn.)
lb. ' Posterior side of the specimen. (Ivaskaskia group, Kentucky.)

Scytalocrinus validus W. and Sp. (MS.) 138

2a. Lateral aspect of a specimen with arms ; the anal opening located anteriorly
in the lower part of the ventral sac.

2b. The ventral sac somewhat enlarged.

3. Anterior side of the sac of another specimen. (Both from the Keokuk group,

Indiana.

Decadocrinus grandis W. and Sp 138

4. Anal opening occupying the anterior side of the sac a little above midway ;

the pores at the lower part of the sac passing through the test, as shown
upon the lateral edges of the plates.

5. A specimen showing the posterior side of the sac. (Keokuk group, Craw-

fordsville, Ind.)

Scaphiocrinus unicus Hall 138

6. Posterior side of a specimen, showing the ventral sac to its full length.

(Locality and position same as last.)

Scytalocrinus (sp. undet.) 138

7. Anterior view of ventral sac, showing the pores along the sides of the plates,

and the position of the anus. (Kaskaskia group, Kentucky.)

Scaphiocrinus Swallovi Meek and Worthen 138

8. Portion of the ventral sac ; composed of stellate plates with pores around

their edges. The ducts of the pores plainly visible in places where the
plates are slightly pushed out of position

Aulocrinus Agassizi W. and Sp. (MS. Nov. gen. and n. sp.) . . 138

(aiA-os a small tube, Kplvov a lily.)

9. Right postero-lateral aspect. Anus at the end of a special tube, given off

half way down from the anterior side of the ventral sac. Sac and tube
profusely perforated by pores. (Keokuk group, Indiana.)

Cceliocrinus ventricosus (Hall) 138

10a. Posterior side of the ventral sac.

106. Anterior side of it.

C v athocrinus nodosus W. and Sp. (MS.) 137

11a. The anus at the end of the ventral sac slightly excentric in position, and
closed by eight or nine plates forming a pyramid.

11b. Distal end of the ventral sac enlarged.

Cyathocrinus brevisacculus W. and Sp. (MS.) 137

12a and b. The ventral sac with the anus in the same condition as in the pre-
ceding species.

(All specimens are in the collection of Wachsmuth and Springer.)

Crinoidea Gamer ata.

Plate. VII.

A.M.Westergren. del.

Heliotype Printing Co. Boston.

CRINOID'EA Camerata.

Plate VIII.

t

F- •'-••'.»

y— — 1 — : —

fill

G Inljevail, Chas R.Keyes.del

Heliotype Printing Go. Boston.

PLATE VIII.

Page

Barrandeocrinus sceptrum Angel 484

Fig. 1. Showing arrangement of the plates in the calyx, and structure of arms and
pinnules. (Drawn by Mr. G. Liljevall from a specimen from Gotland in
the Zool. Riks Mus. at Stockholm) (f).

Crotalocrinus pulcher (Hisinger) 164

2. A specimen from Gotland, showing the net formed arms. (Coll. W. and Sp.)

Crotalocrinus n. sp 164

3. The tegmen of a specimen from Gotland; drawn by Mr. G. Liljevall (Zool.

Riks Mus., Stockholm) (f).

Crotalocrinijs rugosus (J. S. Miller) 164

4. Tegmen of a fine specimen from Dudley, Eng. (\J). (Coll. W. and Sp.)

Taxocrinus intermedius W. and Sp 118, 123

5a. Showing the pavement of the ventral disk, and the pouches along the free
rays. Antero-lateral view.

5b. Posterior view. (Coll. W. and Sp.)

Forbesiocrinus nobilis de Ivon, and le Hon 87, 88

(Plates showing the fossae along the edges.)

6 a. Distal face of the axillary costal (^) .

6b. Proximal face of the same (’T-).

6c. Lateral face of an interradial plate (V). (Same collection.)

Symbathocrinus Savallovi Hall 136

7. A specimen with arms, from the Keokuk group of Canton, Ind. (Coll. W.

and Sp.)

Symbathocrixus Wachsmuthi M. and W 89

8. A specimen with the arms removed at the posterior side, exposing some of

the plates of the anal tube, and the asymmetrical orals. (Coll. W. and Sp.)

9. Another specimen also showing the orals, and the base of the anal tube (f).

(Same collection.)

Pisocrinus (sp. undet.) 136

10. Lateral view of a specimen with arms from Tennessee. (^) (Coll. W.

and Sp.)

(This figure was drawn by Mr. Keyes in 1886, from a specimen found by us
in Western Tennessee in 1883. Mr. S. A. Miller, in the 17th Report of

the Indiana Geological Survey for 1891, p. 637, took the liberty of stating,
most unwarrantably, that we had described, in the third part of the
Eevision of the Palaeocrinoidea, p. 173 (1885) the arms of Pisocrinus,
which we “ knew nothing whatever about.” The tone of his article was
such as to preclude any notice from us, except to publish this figure in
refutation of his statement. Angelin figured the arms of Pisocrinus as
early as 1877.)

Allagecrinus Carpenteri W. and Sp 78

Fig. 11. The type specimen, with two arms in one or more of the rays. (Illinois
State Collection.)

Stephanocrinus angulatus Hall 46

12. A very elongate specimen. (Amer. Mus. Nat. Hist. New York.)

13. The disk in perfect preservation ; the centre closed by five symmetrical

orals. (Same collection.)

Catillocrinus Wachsmuthi M. and W 72

14. Specimen with arms, ventral tube and stem. (Coll. W. and Sp.)

Marsupiocrinus radiatus Angel 103

15. The tegmen, with small, regularly arranged covering pieces (^). (Drawn
from a specimen in the Zool. Eiks Mus., Stockholm, by Mr. G. Liljevall).

PLATE IX.

Page

Reteocrinus Onealli (Hall) 179

Fig. la. Anterior view of a specimen with arms (f). (Coll. I. H. Harris.)

lb. Posterior view of another specimen with arms. (Coll. AV. and Sp.)

lc. Lateral view, showing ventral disk. (Same collection.)

ld. A portion of the ventral disk enlarged. (Same collection.)

le. Inner floor of the calyx, showing the small supplementary plates which

surround the primary interbrachials (f). (Same collection.)

1 f. The type of “ Glyptocrinus cognatas.” (After Miller.)

Reteocrinus magnificus S. A. Miller 181

2. Side view of a specimen with arms and portions of stem. (Col. I. H. Harris.)

Reteocrinus stellaris Billings 178

3a. One of the type specimens, posterior view. (Museum Geol. Surv., Canada.)

3b. Anterior view of another type specimen. (Same collection.)

3c. Part of the calyx, showing the fixed bracliials. (Same collection.)

Reteocrinus fimbriatus Billings 179

4. The type specimen in a lateral view. (Museum Geol. Surv., Canada.)

Xenocrinus Baeri (Meek) 185

5a. Posterior view of a specimen with arms. (Coll. I. H. Harris.)

5b. Lateral view of another specimen with arms. (Coll. W. and Sp.)

5c. Inner floor of calyx Q$). (Coll. I. H. Harris.)

5d. Section of an arm, greatly enlarged.

Xenocrinus penicillus S. A. Miller 183

6a. Lateral view of one of the types (f). (Same collection.)

6b. Posterior view of another type specimen (f). (Same collection.)

Tanaocrinus typus AY. and Sp 186

7a. Posterior view of a type specimen (f). (Coll. AV. and Sp.)

7b. Anterior view of another type specimen (£). (Same collection.)

7c. The stem, enlarged.

Crinoidea Camerata.

Plate IX..

ChasR.Keyes del.

Heliotype Printing Cov!Bostori.

PLATE X.

Page

Arch.eocrinus lacunosus (Billings) 255

Fig. 1. Posterior view of the type specimen. (Museum Geol. Surv., Canada.)

Arcii/Eocrixus microbasalis (Billings) 256

2a. Specimen with arms and stem. (Coll. John Stewart.)

2b. Another specimen. (Same collection.)

2c. Basal aspect. (Same collection.)

Arcii.eocrinus pyriformis (Billings) 255

3a. The type specimen. (Museum Geol. Surv., Canada.)

3b. A crushed specimen, showing the arms. (Same collection.)

Arcieeocrinus desiderates W. R. Billings 257

4 a. The type specimen with arms ; the left posterior radius in front. (Coll.

W. R. Billings.)

4 b. Dorsal aspect of the calyx. (Coll. W. and Sp.)

Diabolocrinus hieroglyphicus W. and Sp 252

5a. Dorsal aspect of a large specimen. (Coll. W. and Sp.)

5b. Side view of the same.

5c. Anal side of a small specimen. (Same collection.)

(Figs. 2c and 5a are drawn with anal side up.)

Crinoidea Camerata.

Plate

Ghas.R.Keyes del.

Heliotype Printing Go. 'Boston.

OF THE

UNIVERSITY of ILLINCI3.

PLATE XI.

Page

Diabolocrinus perplexus W. and Sp 250

Fig. la. Dorsal view of a large calyx, showing very small supplementary pieces
along the sides of the radials and between the interradials.

lb. Ventral aspect of the same.

Diabolocrinus vesperalis White 251

lc. Lateral view of a specimen in which no supplementary pieces are developed.
lcl. Lateral view of a specimen in which the primary interradials are completely

separated from the radials by supplementary pieces. (All in Coll. W.

and Sp.)

Biiaphanocrinus subnodosus (Walcott) 259

2. The type specimen. (Mus. Comp. Zool.)

Biiaphanocrinus sculptus (Miller) 260

3. A specimen with arms. (Coll. I. H. Harris.)

Lyriocrinus melissa (Hall) 263

4 a. A specimen with arms. (After Hall.)

4 b. Dorsal aspect of a large specimen. (Coll. W. and Sp.)

4c. Ventral aspect, showing portion of the tegmen. (Coll. W. F. E. Gurley.)

4 d. A smaller specimen, with the tegmen preserved, and showing the anus.

(Coll. W. and Sp.)

4e. Lateral view of the calyx. (Coll. W. F. E. Gurley.)

4/. A young specimen with arms. (Coll. W. and Sp.)

Lyriocrinus dactylus Hall 262

5a and b. The types. (Amer. Mus. Hat. Hist., New York.)

5c. Specimen showing the pinnules. (Mus. Comp. Zool.)

Riiodocrinus Wortiieni Hall 220

6. A slightly crushed specimen with arms. (Mus. Comp. Zool.)

Rhodocrinus nanus M. and W 228

7 a. The type specimen, lateral view ; from the Burlington Limestone.
lb. Ventral aspect of the same. (Mus. Comp. Zool.)

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PLATE XII.

Page

Riiodocrinus Kirbyi W. and Sp 226

la. Specimen with spreading arms.

lb. Another specimen with arms and column, anterior view,
le. Posterior view of another specimen.

Id. The calyx, posterior view.

Riiodocrinus nanus M. and W 228

2a. Anterior view of a specimen with stem.

2b. Posterior view of another specimen.

(Both from the Kinderhook group.)

Rhodocrinus Barrisi Hall . . 230

3. A small specimen with arms.

4 a. A very large, nodose specimen ; dorsal aspect of the calyx.

4 b. Side view of same specimen.

4 c. Posterior view of same.

4 d. Ventral aspect of same.

5a. Lateral view of another specimen.

5b. Dorsal aspect of same.

Rhodocrinus Barrisi, var. striatus W. and Sp 231

6. Lateral view of dorsal cup.

Riiodocrinus Wortheni Hall 220

7a. Specimen with arms.

7b. Dorsal aspect of calyx.

7c. Ventral aspect of same specimen.

Riiodocrinus Wortheni, var. urceolatus W. and Sp 221

8a. Posterior view of the calyx.

8b. Ventral aspect of same specimen.

Riiodocrinus watersianus W. and Sp 221

9. Specimen with arms and stem.

(All the specimens are in the collection of Wachsmuth and Springer.)

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PLATE XIII.

Pagk

Bhodocrinus Whitei Hall 223

Fig. la. Dorsal aspect of calyx. (Coll. W. and Sp.)
lb. Ventral aspect of same specimen.

1 c. Posterior side of same.

Bhodocrinus truncatus W. and Sp 231

2a. The type specimen, lateral view. (Coll. AY. and Sp.)

2b. Posterior view of same.

2c. Dorsal aspect of same.

2d. Ventral aspect of another specimen. (Same collection.)

2e. Side view of same specimen.

2 f. Side view of a very large specimen. (Same collection.)

Bhodocrinus tuberculatus AAr. and Sp 232

3. Side view of the type. (Coll. AV. and Sp.)

4. Side view of a larger and more nodose specimen. (Same collection.)

Bhodocrinus AVachsmuthi Hall 222

5a. A large specimen with arms. (Coll. AV. and Sp.)

5b. Posterior view of calyx. (Same collection.)

5c. Side view of same specimen.

5d. Dorsal aspect of another specimen. (Same collection.)

Bhodocrinus coxanus AVorthen 222

6. The type specimen ; lateral view. (Coll. L. A. Cox.)

7. Another specimen of this species, described as Bhodocrinus polydactylus.

(Same collection.)

Bhodocrinus nodulosus Hall 225

8. The type specimen. (After Hall.)

Thysanocrinus Halli Lyon 196

9a. Dorsal aspect of calyx. (Coll. Borden Institute, New Providence, Indiana.)

9b. An abnormal specimen. (Same collection.)

Lampterocrinus Tennesseensis Boemer 208

10a. Posterior view of the calyx. (Coll. AV. and Sp.)

105. Ventral aspect of same.

10c. Anterior view of another specimen. (Same collection.)

10<L Portion of the stem.

Thylacocrinus Clarkei AA7. and Sp 248

11a. The type specimen, lateral view. (State Cabinet Nat. Hist. N. Y.)

115. Infrabasal disk, showing the stellate column facet.

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PLATE XIV.

Gilbertsocrinus typus (Hall)

Fig. 1. Dorsal aspect of a large specimen with the appendages preserved nearly
entire. From the Burlington and Keokuk Transition Bed.

2. Another specimen from the same horizon ; side view.

3. A specimen from the Upper Burlington Limestone with the appendages and

portions of the arms preserved.

Page

242

(All specimens in the collection of Wachsmuth and Springer.)

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PLATE XV.

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Gilbertsocrinus tuberosus (Lyon and Cass) 239

Fig. 1 a. A large specimen showing the calycine appendages.
lb. Another specimen, showing the appendages and arms.

Gilbertsocrinus dispansus W. and Sp 240

2a. Ventral aspect of a specimen, with calycine appendages and arms preserved.

2b. Dorsal aspect of the same specimen.

2 c. Lateral view of the calyx.

2d. Ventral aspect of the same specimen.

Gilbertsocrinus spinigerus (Hall) 247

3a. The type specimen, dorsal aspect of the calyx.

3b. Lateral view of the same specimen.

3c. Ventral aspect of the same.

Gilbertsocrinus stellaris De Ivon, and Le Hon 236

4. Side view of a slightly enlarged specimen from Belgium. (In this species,

and the succeeding one from England, the appendages are arranged in live
pairs of separate tubes ; differing from most of the American species, in
which those of adjoining interradii are coalesced for some distance beyond
the calyx.)

Gilbertsocrinus calcaratus Phillips 236

5. Figured to illustrate the differences in the structure of the genus between

European and American forms. Mountain Limestone, England.

Rhodocrtnus Whitei Hall 223

6a. Side view of a large and very perfect specimen.

6b. Dorsal aspect of same specimen.

Bhodocrinus Wachsmuthi Hall 222

7. Anterior side of the calyx.

(All the specimens are in the collection of Wachsmuth and Springer except
that illustrated by figs. 3a, b, c, which is in the Canada Survey Museum
at Ottawa.)

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PLATE XVI.

Page

Gilbertsocrinus tuberosus (Lyon and Cass) 239

ig. 1. Specimen with stem.

2. Another specimen ; ventral aspect.

3. Ventral aspect of another specimen with additional branches in the appen-

dages. The anal opening covered over by a Platyceras equilaterum.

4. Ventral aspect of another specimen.

5. Dorsal aspect of calyx, showing the bases of the arms.

6. A crushed specimen with appendages, arms, and pinnules.

(All specimens in the collection of Wachsmuth and Springer.)

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PLATE XVII.

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Gilbertsocrinus reticulatus (Hall) 244

Fig. la. Dorsal aspect of the calyx.

lb. Lateral view of another specimen.

Gilbertsocrinus fiscellus (M. and W.) 245

2 a. Anterior view of calyx.

2b. Posterior view of same.

2c. Ventral aspect of same.

2d. Posterior view of another specimen, in which the appendages next to the

posterior side separate within the calyx.

Gilbertsocrinus tenuiradiatus (M. and W.) 246

3. Dorsal aspect of a crushed specimen, showing parts of the appendages.

Gilbertsocrinus obovatus (M. and W.) 241

4a. Side view of calyx.

lb. Ventral aspect of same. (Figure drawn anal side up.)

Gilbertsocrinus tuberculosus (Hall) 243

5 a. A specimen with arms, appendages, and stem.

5b. Dorsal aspect of another specimen.

5c. Ventral aspect of same.

Gilbertsocrinus tuberosus (Lyon and Cass) 239

6. Dorsal aspect of calyx.

Gilbertsocrinus ttpus (Hall) 242

la. A large specimen from the Upper Burlington Limestone.

lb. Portion of the arms, showing mode of bifurcation.

(All specimens in the collection of Wachsmuth and Springer.)

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PLATE XVIII.

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Ptychocrinus parvus (Hall) 199

Fig. la. View of the specimen described by S. A. Miller as Glyptocrinus annularis
(?). (Coll. S. A. Miller.)

lb. Another specimen with the arms better preserved (f). (Same collection.)

2. The specimen described by Wetherby as Glyptocrinus ( Reteocrinus ) aracilis
(2). (Coll. Mr. Vaupel.)

Ptychocrinus splendens (Miller) 198

3a. The type specimen (f). (Coll. S.A. Miller.)

3b. Another specimen (f). (Same collection.)

Thysanocrinus liliiformis Hall 192

4. The type specimen. (Museum of Cornell University.)

Thysanocrinus occidentalis (Hall) 194

5a. Side view of calyx (f). (After Hall.)

5b. Posterior view of calyx. (After Hall.)

5c. Dorsal aspect of calyx (f). (After Hall.)

Thysanocrinus inornatus (Hall) 193

6a. Anterior view of calyx. (Coll. W. F. E. Gurley.)

6b. Posterior view of same specimen.

6c. Ventral aspect of same (f).

6cl. A young specimen, probably of this species. (Same collection.)

Thysanocrinus brachiatus (Hall) 195

7. Dorsal aspect of the type specimen ; the matrix removed so as to show the
pinnules and the arrangement of the plates. (Am. Mus. Nat. Hist. N. Y.)

Idiocrinus elongatus W. and Sp 203

8a. The type specimen; side view. (Coll. W. and Sp.)

8b. Ventral aspect of same (|5).

8c. Another view of the ventral disk (f). (Anal side to the right. Coll. W.
and Sp.)

Idiocrinus ventricosus W. and Sp 205

9a. The type specimen ; side view. (Same collection.)

9b. Dorsal aspect of the dorsal cup. (Anal side to the left. Same collection.)

Idiocrinus immaturus (Hall) 206

10a. The type specimen; anterior view. (Am. Mus. Nat. Hist. N. Y.)

10J. Posterior view of same.

,10c. Dorsal aspect of same. (After Hall.)

Idiocrinus tennesseensis (Worthen) 206

11. The type specimen. (Illinois State Collection.)

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PLATE XIX.

Page

Siphonocrinus nobilis (Hall) 212

g. la. Gutta percha cast made froni a natural mould. (After Hall.)
lb. The quinquepartite infrabasal disk.

2a. Internal cast, showing the arrangement of the ambulacra upon the left side.

(Coll. T. A. Green.)

2b. Lateral view of a similar cast, showing their arrangement at the right side.

(Same collection.)

2c. Ventral aspect of another cast. (Same collection.)

Siphonocrinus armosus McChesney 211

за. Left side of an internal cast ; the anal tube overlying the ambulacra, and

passing over to the anterior side of the calyx, being subtegmiual to the
arm regions. (Same collection.)

зб. Another specimen, showing the right side of the calyx. (Same collection.;

3c. Ventral aspect of another cast. (Same collection.)

Siphonocrinus pentagonus W. and Sp 213

4a. The type specimen ; lateral view. (Same collection.)

46. Ventral aspect of another specimen. (Same collection.)

Thysanocrinus inornatus (Hall) 193

5. Dorsal aspect of specimen with portions of arms. (Coll. W. and Sp.)

Hyptiocrinus typus W. and Sp * . . . . 201

ба. Dorsal aspect of the specimen described by Miller as Cyphocrinus Gorbyi.

(After Miller, drawn with the anal side down.)

бб. Lateral view of calyx. (Coll. W. and Sp.)

6c. Ventral aspect of calyx. (Same collection.)

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PLATE XX.

Page

Glyptocrinus Dyeri (Meek) 271

Fig. la. A large specimen with arms. (Coll. I. H. Harris.)

lb. Posterior view of a large, flattened specimen of the type of Gl. Richardsoni
Wetherby, showing the fixed pinnules. (Coll. W. and Sp.)

1 c. The base, showing the angles of the axial canal to be interradial. (Coll.

Mr. E. H. Vaupel.)

Glyptocrinus marginatus Billings 275

2. The type specimen; postero-lateral view. (Mus. Geol. Surv., Canada.)

Glyptocrinus Fornshelli Miller 276

3. The calyx and part of the stem. (Coll. I. H. Harris.)

Glyptocrinus decadactylus Hall 270

4 a. A very large specimen. (After Meek.)

4 b. Posterior view of calyx. (Coll. I. H. Harris.)

4c. Ventral aspect of a rather small specimen (f). (Coll. E. 0. Ulrich.)

4 d. Ventral aspect of an older specimen (f). (Coll. W. and Sp.)

4e. Portions of the arms, showing covering-plates (f). (Same collection.)

Glyptocrinus ramulosus Billings 273

5a. One of the type specimens ; lateral view. (Mus. Geol. Surv., Canada.)

5b. Another type specimen, showing the ramifications of the arms. (Same
collection.)

Glyptocrinus ornatus Billings 274

6re. The type specimen; anterior view. (Mus. Geol. Surv., Canada.)

6b. Posterior view of same specimen.

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PLATE XXI.

Page

Periglyptocinus Billingsi W. and Sp 277

Fig. la. Posterior view of a specimen with arms and stem. (Coll. John Stewart,
now in the Cauada Survey Museum at Ottawa.)
lb. Another specimen in the same collection, showing the left postero-lateral
ray and anal interradius.

Periglyptocrinus priscus (Billings) 278

2. The type specimen. (Museum Geol. Surv., Cauada.)

Glyptocrinus Dyeri (?) 271

3 a-c. Young specimens, probably of G. Dyeri (f).

3d. Type of Miller’s P ycnocrinus Shafferi (f). (Coll. S. A. Miller.) .... 272
3e. Type of Miller’s P ycnocrinus Shafferi, var. germanus (f). (Same collection.)

3 f. A somewhat larger specimen iff). (Coll. W. and Sp.)

Glyptocrinus decadacty'lus Hall 270

4 a. Inner floor of the dorsal cup (f). (Coll. E. O. Ulrich.)

4 b. Interior view of the basal cup (f). The angles of the axial canal directed
interradially. (Coll. W. and Sp.)

Glyptocrinus Fornshelli Miller 276

5. Interior view of the basal cup (p). The angles of the axial canal directed

radially. (Coll. I. H. Harris.)

Glyptocrinus Dyeri Meek 271

6. Calyx, showing the posterior side of a large, highly ornamented specimen.

(Coll. E. 0. Ulrich.)

Compsocrinus miamiensis S. A. Miller 518

7 a. The type specimen; posterior side. (Coll. I. H. Harris.)
lb. Anterior view of another specimen. (Coll. W. and Sp.)

Compsocrinus Harrisi S. A. Miller 517

8a. One of the type specimens; lateral view ( p ). (Coll. I. H. Harris.)

8b. Posterior view of another type specimen (f). (Same collection.)

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Mariacrinus Warreni Ringueberg 283

Fig. 1. The type specimen. (Coll. Dr. E. N. S. Ringueberg.)

Mariacrinus Carleyi (Hall) 282

2a. Postero-lateral view of calyx. (Coll. I. H. Harris.)

2b. Anterior view of same specimen.

2c. Ventral aspect of the same.

Technocrinus spinulosus (Hall) 305

3. The type specimen. (Am. Mus. Nat. Hist. N. Y.)

Melocrinus bainbridgensis H. and W 297

4a. The type specimen; side view. (After Hall and Whitfield.)

4b. Dorsal aspect of same.

4c. The arms. (After Hall and Whitfield.)

Melocrinus gracilis W. and Sp 298

5. The type specimen ; side view. (Coll. J. M. Clarke.)

Melocrinus Calvini W. and Sp 300

6. The type specimen. (Coll. Prof. S. Calvin.)

Melocrinus Tiffanyi W. and Sp 299

7a. The type specimen; right posterior view. (Coll. A. S. Tiffany.)

7b. The basals of same.

Melocrinus parvus W. and Sp . . . 303

8. The type specimen; anterior view (|*). (Coll. W. and Sp.)

Melocrinus oblongus W. and Sp 300

9. Lateral view of a very elongate calyx. (Coll. W. and Sp.)

Melocrinus obconicus Hall 302

10a. Lateral view of calyx. (Same collection.)

10 b. Ventral aspect of another specimen. (Same collection.)

10c. The basals.

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PLATE XXIII.

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Meloceinus nobilissimus (Hall) 295

Fig. 1. The type specimen. (Amer. Mus. Nat. Hist.)

2. Diagram showing the arrangement of the plates.

3. Portion of one of the radial trunks, showing the origin of the arms. (After

Hall.)

Meloceinus paciiydactylus (Hall) 296

4. The structure of the radial trunks and the origin of the arms. (After Hall.)

5. The type specimen of “ Mariacrinus ” paucidactylus Hall. (After Hall.)

Maeiaceinus plumosus Hall . .■ 284

6. The type specimen. (After Hall.)

7. Dorsal cup of a larger specimen. (After Hall.)

Maceostyloceinus oenatus Hall 286

8a. The type specimen. (After Hall.)

85. One of its radials, enlarged.

8c. A portion of an arm, enlarged.

Maceostyloceinus fusibeachiatus Ringueberg 291

9. The type specimen. (Coll. Dr. E. N. S. Ringueberg.)

10. A smaller, somewhat distorted specimen. (Same collection.)

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PLATE XXIV.

Pace

Hadrocrinus discus Lyon 328

Fig. 1. The type specimen ; dorsal aspect. (Coll. S. S. Lyon.)

Hadrocrinus plenissimus Lyon 328

2a. The type specimen ; dorsal aspect. (Coll. S. S. Lyon.)

2b. Inner floor of dorsal cup. (Same collection.)

Technocrinus Andrewsi Hall 306

3. The type specimen, after Hall. (From a gutta percha cast made from
a natural mould in sandstone.)

Melocrinus pachydactylus (Hall) 296

4 a. The type specimen. (After Hall.)

4 b. Another specimen. (Am. Mus. Nat. Hist.)

Melocrinus bainbridgensis Hall and Whitf 297

5. The specimen described by S. H. Williams as Melocrinus Clarkei. (N. Y.

State Cabinet of Nat. Hist.)

(?) Stelidiocrinus argutus (Walcott) 280

6. The type specimen. (After Walcott. Coll. Mus. Comp. Zool.)

Allocrinus typus W. and Sp 307

la. Side view of one of the types. (Coll. W. and Sp.)

lb. Basal view of same specimen.

Allocrinus Benedicti S. A. Miller 308

8a. Side view of calyx. (Same collection.)

8b. Basal view of same specimen.

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PLATE XXV.

Page

Dolatocrinus excavatus W. and Sp 321

'ig. 1. Dorsal aspect. (Coll. Victor W. Lyon.)

Dolatocrinus Marshi, var. iiamiltonensis W. and Sp. . . . 314

2 a. Dorsal aspect. (Coll. Victor W. Lyon.)

2b. Ventral aspect of the same specimen.

Dolatocrinus tuberculatus W. and Sp 324

3. Dorsal aspect. (Victor W. Lyon.)

Dolatocrinus speciosus Hall 323

4 a. Dorsal aspect. (Coll. W. and Sp.)

4 b. Side view of the same specimen.

Dolatocrinus major W. and Sp 322

5. Dorsal aspect. (Coll. Victor W. Lyon.)

Dolatocrinus Lyoni W. and Sp 314

6a. Dorsal aspect. (Same collection.)

6b. Ventral aspect of another specimen. (Same collection.)

6c. Side view of the same specimen.

6d. Portion of the tegmen, showing the slits ; enlarged.

Dolatocrinus canadensis Whiteaves 315

7a. Dorsal aspect. (After Whiteaves.)
lb. Ventral aspect of same specimen.

Stereocrinus trtangulatus Barris 325

8a. The type specimen. (Museum Davenport Acad. Nat. Sci.)

8b. Side view of same specimen.

Stereocrinus Barrisi W. and Sp 326

9a. Side view of a fine specimen. (Same collection.)

9b. Ventral aspect of another specimen. (Coll. W. and Sp.)

Centrocrinus pentaspinus Lyon 309

10a. The type specimen ; dorsal view. (Coll. S. S. Lyon.)

10A Side view of same specimen.

10c. Side view of another specimen in the Lyon collection. (Described as
Actinocri n us multico runs.)

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Dolatocrinus Marshi Lyon 312

Fig. la. The type specimen ; posterior view. (Coll. S. S. Lyon.)

lb. Dorsal aspect of same specimen.

lc. Ventral aspect of same.

ld. Inner floor of the inverted basal cup, showing its derivation from 3 plates.

Dolatocrinus glyptus Hall 317

2a. The type specimen ; posterior view. (Am. Mus. Nat. Hist. N. Y.)

2b. Basal aspect of another specimen. (Coll. J. M. Clarke.)

Dolatocrinus liratus Hall 319

3. A somewhat flattened specimen. (Am. Mus. Nat. Hist.)

Dolatocrinus triadactylus Barris 316

4 a. The type specimen ; anterior view. (Museum Davenport Acad. Sci.)

4b. Another specimen, giving a posterior view of the calyx. (Same collection.)

4c. Another showing the dorsal view of calyx. (Coll. W. and Sp.)

4d. Ventral aspect of the same specimen.

Dolatocrinus icosidactylus W. and Sp 319

5a. Dorsal aspect of calyx. (Coll. V. W. Lyon.)

5b. Posterior view of the same specimen.

5c. Ventral aspect of same.

5d. Dorsal aspect of another specimen. (Coll. W. and Sp.)

Dolatocrinus lacus Lyon 311

Ga. The type specimen ; anterior view. (Coll. Sidney S. Lyon.)

6b. Dorsal aspect of the same specimen.

6c. Ventral aspect of same.

Dolatocrinus excavatus W. and Sp 321

7. Inner floor of the ventral disk. (Coll. V. W. Lyon.)

8. Inner floor of basal disk.

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PLATE XXVII.

Batockinus graxdis (Lyon)

la. Lyon’s type specimen, — a fine example with arms

lb. Portion of an arm from near the top, enlarged.

2 a. Lateral view of the calyx.

2b. Posterior view of a specimen with anal tube.

Batocrixus icosidactylus Casseday

3a. Lateral view of a large specimen.

3b. Dorsal aspect of another specimen.

3c. Portion of the anal tube.

Batocrixus irregularis Casseday

4 a. Posterior view of the calyx, somewhat enlarged.

4 b. Lateral view of the same specimen.

4 c. Portion of the anal tube.

Batocrixus turbixatus (Hall)

5a. Posterior view of the calyx.

5b. Lateral view of another specimen.

5c. Antero-lateral view of a specimen with arms.

Batocrixus turbixatus, var. elegaxs (Hall)

6a. Lateral view of the calyx.

6b. Posterior view of the same.

Batocrixus caxtoxexsis Miller and Gurley

7 a. Posterior view of a specimen, showing anal tube.

7b. The same view of a specimen with arms.

Batocrixus clypeatus (Hall)

8a. Lateral view of the calyx.

8b. The same of another specimen (variety B. papillatus).

8c. Anterior view of a more wheel-shaped specimen.

8 cl. Posterior view of a young specimen (typical form).

8e. Lateral view of a small specimen with arms (variety B. inomatus .)

(All the specimens are in the collection of Wachsmuth and Springer, except
that of Pig. la, which is in the Lyon collection.)

Page

381

368

369

375

376

383

380

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PLATE XXVIII.

Page

Lobocrinus longirostris (Hall) 442

Fig. la. Anterior view of a specimen with arms, anal tube, and column. (Mus.
Comp. Zool.)

lb. Portion of an arm with the pinnules, enlarged.

1 c. Anterior view of the calyx. (Coll. W. and Sp.)

ld. Posterior view of the calyx. (Same collection.)

le. A very young specimen. (Same collection.)

Batocrinus lepidus (Hall) 372

2. Side view of the calyx, showing the bifurcation of the left postero-lateral

ray. (Coll. W. and Sp.)

3. Posterior view of the calyx. (Same collection.)

Batocrinus quasillus Meek and Worthen 372

4 a. Side view of the calyx. (Same collection.)

4 b. Specimen showing the anal interradius. (Same collection.)

Batocrinus .equalis (Hall) 371

5. Posterior view of the calyx. (Same collection.)

6. Specimen with arms. (Mus. Comp. Zool.)

Batocrinus sub^qualis (McChesney) 369

la. Fine specimen with arms. (Same collection.)

lb. Portion of an arm with the pinnules, enlarged.

8a. Lateral view of the calyx. (Same collection.)

8b. Posterior view of the same specimen.

D. A specimen with portion of anal tube, and showing the bifurcation of the
right postero-lateral ray. (Same collection.)

Batocrinus tuberculatus W. and Sp 379

10a. Posterior view of the type specimen. (Coll. W. and Sp.)

10 b. Another specimen, showing the left postero-lateral ray. (Same collection.)

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PLATE XXIX

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Dizygocrinus dodecadactylus (Meek aud Worthen) 432

Fig. la. Lateral view of the calyx.

lb. Posterior view of the same.

lc. Ventral aspect of same.

Dizygocrinus andrewsianus (McChesney) 433

2 a. Posterior view of the calyx.

2b. Lateral view of another specimen.

2c. A specimen with arms, showing one of the postero-lateral rays.

2d. Posterior side of a specimen with arms.

Dizygocrinus rotundus (Yandell and Shum.) 431

3a. Dorsal aspect of the calyx.

3b. Ventral aspect of the calyx ; the plates but slightly convex.

3c. Ventral aspect of a specimen with distinctly convex plates.

3d. Lateral view of the calyx.

3e. Another specimen, having part of the anal tube preserved.

3f. Side view of a specimen with twenty arms.

3g. A larger specimen with twenty-two arms.

4. Ventral aspect of a more discoid specimen (type of Actinocrimis oblatus Hall.)

Batocrinus laura (Hall) 384

5 a. Large specimen with arms.

5b. Anterior view of the calyx.

5c. Lateral view of another specimen.

5d. Posterior view of a more conical specimen.

Eutrochocrinus Christyi (Shumard) 409

6. A young specimen (f).

Eutrochocrinus Lovei W. and Sp 412

7. A young specimen (\).

Lobocrinus ^quibrachiatus (McChesney) 440

8a. Posterior side of the calyx.

8b. Lateral view of another specimen.

Lobocrinus ajquibrachiatus var. asteriscus (M. and W.) . . 441

9a. Dorsal aspect of the calyx (anal interradius the lower one).

%. Ventral aspect of the calyx.

(All specimens in the collection of Wachsmuth and Springer.)

Crinoidea Camerata.

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Batocrinus Macbridei W. and Sp 376

Fig. 1. Specimen with arms, stem, and cirri.

2. Another specimen with arms and stem.

3. Ventral aspect of calyx (\).

Batocrinus mundulus Hall 382

4 a. Posterior view of the calyx.

4 b. Lateral view of the same.

5. Specimen with arms from Bono, Iud., probably of this species.

Batocrinus poculum S. A. Miller 378

6. Specimen with anal tube, arms, and stem. ✓

Lobocrinus Yandelli (Shumard) 441

7 a. The type specimen, showing anal side.
lb. Dorsal aspect of the same specimen.

Lobocrinus robcjstus W. and Sp 436

8 a. The type specimen ; antero-lateral side.

8b. Posterior side of the same.

Lobocrinus Hageri (McChesney) 445

9. Posterior side of the calyx.

10. Antero-lateral side of another specimen.

Lobocrinus spiniferus W. and Sp 439

11. One of the type specimens, showing the anterior side.

12. Another type specimen, showing the posterior side.

Macrocrinus jucundus (S. A. Miller) 451

13. Calyx and anal tube ; anterior side.

14. Specimen with arms ; antero-lateral side.

Macrocrinus verneuilianus (Shumard) 450

15. Large specimen with arms and anal tube.

16. Another specimen ; the tube somewhat inflated.

17. Posterior side of the calyx; the plates but little convex.

18. Anterior side of the calyx ; a very large, nodose specimen.

(All the specimens in the collection of TVachsmuth and Springer, except that
of Fig. 7, which is in the Lyon collection.)

Grinoidea Camerata.

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PLATE XXXI.

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Lobocrinus Nashville (Troost) 435

. 1. Fine specimen with stem and anal tnbe.

Lobocrixus NASHviLLiE var. subtractus (White) 436

2a. Posterior side of a specimen with stem and anal tube.

2b. Portion of a deformed stem from another specimen.

Lobocrinus pyriformis (Shumard) 437

3a. Anterior view of the typical form ; part of stem and anal tube preserved.

3 b. Posterior side of a varietal form.

3c. Anterior view of an elongate variety.

3 cl. Perfect specimen with stem, arms, and anal tube.

3e. Section of an arm (enlarged), showing the spinous processes along the sides
of the free brachials.

Batocrixus pistillus M. and W 378

4a. Posterior view of the calyx.

4 b. Anterior view of another specimen.

(All the specimens in the collection of Wachsmuth and Springer.)

Crinoidea Games ata.

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PLATE XXXII.

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Eutrochocrinus Christyi (Shumarcl) 409

Fig. la. Lateral view of a specimen, showing arms, stem, and anal tube.

lb. A specimen preserving the extremity of the anal tube ; viewed from above.

1 c. Posterior view of the calyx.

Eutrochocrinus Lovei (W. and Sp.) 412

2a. Lateral view of the type specimen.

2b. Anterior view of the calyx.

Eutrochocrinus Christyi var. trochiscus (M. and W.) . . . 410

3. Posterior view of the calyx.

Eutrochocrinus planodiscus (Hall) 411

4 a. Ventral aspect of the calyx.

4 b. Dorsal aspect of same ; basals and first radials broken away.

(All specimens in the collection of Wachsmuth and Springer.)

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PLATE XXXIII.

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Dizygocrinus originarius W. and Sp 421

la. The type specimen.

lb. Specimen with one arm paired, the others single.

Eretmocrinus intermedius W. and Sp 404

2a. Side view of a specimen with arms.

2b. Another example.

2c. Another specimen; top view, showing the spatulate, infolding arms.

Dizygocrinus montgomeryensis (Worthen) 428

3. Specimen with arms, anal tube, and stem; from Crawfordsville, Ind.

4. Another specimen with arms (all paired but one) ; from Keokuk, Iowa.

Dizygocrinus montgomeryensis var. unibrachiatus W. and Sp. 429

5a. A somewhat abnormal specimen with arms and stem. (Coll. L. A. Cox.)

5b. Another specimen with arms. (Same collection.)

5c. Posterior view of another specimen.

Dizygocrinus indianensis L. and C 415

Get. Postero-lateral side of a specimen with arms.

66. Calyx of another specimen, exposing anal side.

Dizigocrinus indianensis var. simplex W. and Sp 415

7. Anterior view of a specimen with arms.

Dizygocrinus cantonensis W. and Sp 423

8a. Specimen with portions of the arms, and showing anal tube.
86. Another specimen, showing the arms and anal tube.

Dizygocrinus biturbinatus (Hall) 427

9. Lateral view of the calyx.

Dizygocrinus Whitei W. and Sp 419

lOa. Specimen with arms from the Keokuk group of Bono, Ind.

106. Lateral view of the calyx. (Same locality.)

11. Posterior view of the calyx. (Specimen from the Warsaw limestone of

Kentucky.)

Dizygocrinus facetus Miller and Gurley 418

12. Specimen from Canton, Ind., showing anal interradius.

(All specimens in the collection of Wachsmuth and Springer, unless other-
wise stated.)

OR 1 NO IDEA CAMBRATA.

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PLATE XXXIV.

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Eretmocrinus calyculoides (Hall) 395

Eig. la. Lateral view of a specimen having the lower part of the arms preserved.
lb. Opposite view of the specimen, showing anal tube.

2. A specimen showing the paddle-shaped tips of the arms.

3. Lateral view of the calyx, showing the excentric position of the anal tube.

4. Showing the curvature of the anal tube.

Eretmocrinus granuliferus W. and Sp 390

5a. Lateral view of the type specimen.

5b. Opposite side of the specimen, showing the paddle shaped arms and anal
tube.

5c. A detached plate showing surface ornamentation.

Eretmocrinus calyculoides var. nodosus W. and Sp 396

6. Posterior side of the type specimen.

7. A specimen showing the anal side.

8. Lateral view of a very elongate specimen.

Eretmocrinus pr^gravis S. A. Miller 405

9. Lateral view of the calyx.

10. Posterior view of another specimen.

Gennjeocrinus kentuckiensis (Shum.) 548

11. Dorsal aspect of the calyx.

12. Eight postero-lateral side of another specimen.

13. Aspect of the ventral disk.

Genn.focrinus eucharis (Hall) 549

14. Portion of the dorsal cup

Acacocrinus americanus W. and Sp 515

15a. Anterior side of the type specimen.

■ 15A Posterior side of the same specimen.

Acacocrinus Elrodi W. and Sp 515

16. The type specimen.

Page

Aorocrinus elegans (S. A. Miller) 480

Fig. 17a. Posterior side of the type specimen.

176. Ventral aspect of the same.

Lobocrinus inflatus (Rowley and Hare) 444

18a. Anterior view of the type specimen.

186. Lateral view of the specimen described by Rowley and Hare as Batocrinus
bulbosus.

Dizygocrinus Gurleyi (S. A. Miller) 422

19. The type specimen.

(All the specimens are in the collection of Wachsmuth and Springer, except
those represented by Figs. 18a and 186, which are in the possession of Mr.

R. R. Rowley, and Fig. 19, which is owned by Mr. F. A. Sampson.)

Crinoidea Camerata.

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PLATE XXXV.

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Macrocbinus Konincki (Shumard) 447

Fig. 1. Specimen with anal tube, arms, and stem. (Mus. Comp. Zool.)

2. Calyx, showing anal side.

3. Another specimen, showing anterior side.

Macrocrinus lagunculus (Hall) 453

4. Calyx, postero-lateral side.

Dizygocrinus indianensis (Lyon) 415

5. The arms of the two posterior rays nearly all paired ; those of the three an-

terior rays mostly single in the specimen.

Dizigocrinus decoris (Miller) 420

6. Calyx, in a side view.

Dizygocrinus euconus (Meek and Worthen) 430

7 a. Calyx, showing the postero-lateral ray, and the anal interradius. (A. speci-
men from Taylor Co., Ky.)
lb. Dorsal aspect of the same specimen.

Dizygocrinus mutabilis W. and Sp 429

8. Anterior side of the calyx.

9. Specimen with arms in a side view.

10. Specimen with anal tube, and most of the arms paired.

11. Specimen in which one half of the arms are single.

Dizygocrinus Wiiitei var. didactylus W. and Sp 420

12. Specimen with the arms all paired.

13. Specimen in which most of the arms are single.

Dizygocrinus oeiginarius var. adultus W. and Sp 422

14. Specimen with most of the arms paired.

15. Another in which most of the arms are single.

Dizygocrinus unionensis (Worthen) . 424

16. Anterior side of calyx.

17. Anal side of a crushed specimen.

18. Side view of another specimen.

19. Posterior side of a specimen with arms.

20. Another specimen, showing posterior side.

Page

Dizygocrinus unionensis var. divalis (S. A. Miller) 425

Fig. 21. Specimen with arms, showing anterior side; the arms alternately paired.

22. Side view of the calyx.

23. Dorsal aspect of a specimen in which all the arms are jiaired.

24. Specimen with some of the arms paired.

(All specimens in the collection of Wachsmuth and Springer, unless other-
wise stated.)

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PLATE XXXVI.

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Eretmocrinus remibrachiatus var. expansus W. and Sp. . . . 390

Fig. 1. Ventral aspect of a large specimen, showing the folding of the arms. The
radial trunk of an Eucladocrinus millebrachiatus lying on top.

Eretmocrinus clio (Hall) 393

2a. Specimen with arms and column.

2b. Posterior side of the calyx.

Eretmocrinus neglectus (Meek and Worthen) . 394

3. Anterior side of the calyx.

Eretmocrinus cl<elia (Hall) 398

4 a. Specimen with arms and column.

4 b. Side view of a somewhat crushed specimen.

Eretmocrinus corbulis (Hall) 399

5a. Ventral aspect of'the calyx.

5b. Dorsal aspect of the same.

5c. Lateral view of another specimen.

6. Fine specimen with arms.

Eretmocrinus leucosia (Hall) 401

7a. Specimen with part of arms (basals and radials not preserved).

7b. Posterior side of the calyx.

7c. Dorsal aspect of the same.

Macrocrinus gemmiformis (Hall) 419

8. Posterior side of the calyx.

Eretmocrinus rugosus W. and Sp 402

9a. Posterior side of the type specimen.

9 b. Ventral aspect of the calyx. (Same specimen.)

9c. The base of the same specimen.

Eretmocrinus minor W. and Sp 391

10a. Posterior side of the type specimen.

106. Antero-lateral side of another specimen.

Eretmocrinus depressus AV. and Sp 392

11a. Posterior side of the type specimen.

116. Posterior side of a smaller specimen, with more convex plates.

(All the specimens in the collection of AVachsmuth and Springer.)

Crinoidea Gamer ata.

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PLATE XXXVII.

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Eretmocrixus remibrachiatus var. expaxsus W. and Sp. . . . 390

. la. Specimen from the Burlington and Keokuk transition bed ; dorsal aspect.
lb. Side view of the calyx; from same bed.

Eretmocrixus remibrachiatus (Hall) 388

2 a. Lateral view of a specimen from the Upper Burlington Limestone.

2b. Another example from the same bed.

Eretmocrhstus magxificus Lyon and Cass 386

3. A large specimen, with rows of angular nodes following the rays and their
subdivisions.

Eretmocrixus ramulosus (Hall) 387

4a. Posterior side of a large calyx from Tennessee.

4 b. Dorsal aspect of a highly ornamented specimen from Iowa.

5a. Arm fragment, probably belonging to this species (from Tennessee).

5b. Cross-section of it.

5c. Upper portion of another arm fragment from the same locality.

5d. The cross-section.

Eretmocrixus matuta (Hall) 396

6a. Specimen with arms ; the anal tube bent outward.

6b. Specimen showing the natural curving of the anal tube.

6c. A large calyx.

Eretmocrixus coroxatus (Hall) 403

7a. Dorsal aspect of the calyx.

7b. Anterior side of same.

7c. Ventral aspect of another specimen.

Macrocrixus carica (Hall) 448

8. Anterior side of the calyx.

Eretmocrixus clio (Hall) 393

9a. Anterior side of the calyx.

9b. Ventral aspect of a more lobate specimen.

(All specimens in the collection of Wachsmuth and Springer.)

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PLATE XXXVIII.

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Agaricocrixus convexus (Hall) 508

Fig. la. Side view of tlie calyx, and portions of the arms.

1&. Ventral aspect of the calyx.

Agaricocrixus brevis (Hall) 511

2 a. A fine specimen with arms.

2b. Ventral aspect of the calyx.

2c. Posterior side of the calyx.

2d. Dorsal aspect of the calyx.

2e. Side view of the calyx.

Agaricocrixus fiscellus (Hall) 512

3a. Dorsal view of the calyx.

3b. Ventral aspect of the same specimen.

3c. Postero-lateral side of same.

Agaricocrixus pyramidatus (Hall) 512

4 a. Specimen with arms.

4 b. Dorsal aspect of the calyx.

4c. Ventral aspect of the calyx.

5a. Posterior side of a young specimen.

5b. Dorsal view of same.

5c. Ventral aspect of same.

Agaricocrixus plaxocoxvexus (Hall) 503

6a. Dorsal view of the calyx.

6b. Side view of another specimen.

6c. Ventral aspect of same.

Agaricocrixus stellatus Hall 508

7a. Dorsal view of a specimen with arms.

7b. A small specimen with arms.

7c. Dorsal aspect of the calyx.

7 d. Another specimen, showing the anal side.

7c. The same, showing the ventral aspect of the calyx.

(All figures from specimens in the collection of Wachsmuth and Springer.)

Crinoidea Camerata.

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PLATE XXXIX.

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Agaricoceixus Coreyi (L. and C.) 510

g. la. Basal view of the type specimen. (Lyon collection.)
lb. Side view of the same.

Agaricocrixus crassus Wetherby 499

2 a. Side view of a large specimen. (Coll. L. A. Cox.)

2b. Dorsal aspect of the same specimen.

Agaricocrixus excavatus Hall 491

3. Side view of a specimen with greatly protruding anus. (Coll. W. and Sp.)

4. Dorsal aspect of another specimen. (Same collection.)

5. Dorsal aspect of another. (Same collection.)

Agaricocrixus xodulosus, var. Macadamsi Worthen .... 498

C. Side view of a large specimen. (Same collection.)

Agaricocrixus coxicus W. and Sp. . 501

7. A fine specimen with Myzostoma (?) cysts on two arms.

8. Posterior view of the calyx. (Both specimens in the coll. W. and Sp.)

Agaricocrixus Worthexi Hall 490

9. Dorsal aspect of a specimen in which the second costals are produced into

large nodes. (Coll. L. A. Cox.)

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Agaricocrinus splendens S. A. Miller 495

Fig. 1 a. A large specimen with arms and stem.
lb. Dorsal aspect of another specimen.

1 c. Ventral aspect of the calyx.

(?) Agaricocrinus nodulosus Worthen 497

2. Dorsal aspect of a very smooth specimen with portions of the arms, from
Canton, Ind.

Agaricocrinus elegans Wetlierby 500

3a. Dorsal aspect of a specimen from Hamilton, 111.

3b. Ventral aspect of the same.

Agaricocrinus crassus Wetlierby 499

4. Tegmen of a small specimen from Tennessee ; the food grooves of the pos-
terior rays covered by large alternate plates.

Agaricocrinus Wortheni Hall 490

5a. Posterior side of a large specimen.

5b. Anterior side of the same.

5c. Dorsal aspect of same.

5d. Ventral aspect of same.

Agaricocrinus americanus, var. tuberosus (Hall) 489

6. Dorsal aspect of the calyx.

(All the specimens in the collection of Wachsmuth and Springer, except that of
Fig. 5, which is in the Museum of Comparative Zoology.)

3R1N0IDEA CAMERATA.

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Agaricocrinus inflatus Hall 502

. la. A large specimen with arms (the arms slightly restored.)

lb. Posterior side of the calyx.

lc. Dorsal aspect of another specimen.

ld. The summit of the tegmen.

Agaricockinus bullatus Hall 493

2 a. Specimen with arms and stem.

2 b. Dorsal aspect of a large calyx.

2c. Ventral aspect of same.

2 d. Inner floor of dorsal cup.

Agaricocrinus gracilis M. and W 513

3a. A large specimen with arms.

3b. Posterior side of calyx.

3c. Dorsal aspect of same.

Agaricocrinus bellatrema Hall 506

4 a. A specimen with portions of the arms.

4 b. Posterior side of the calyx with one arm attached.

4c. Posterior side of a smaller specimen.

4 d. Side view of a large specimen.

Agaricocrinus bellatrema, var. major W. and Sp 507

5. Ventral aspect of a very nodose specimen.

(All specimens in the collection of Wachsmuth and Springer.)

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PLATE XLII.

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Agaricocrinus americanus (Roemer) 488

Fig. 1. Specimen with arms, from Indiana.

2a. Posterior side of the calyx (specimen from Tennessee).

2b. Anterior side of another specimen (from the same locality).

Agaricocrinus Wiiitfieldi Hall 496

3. Ventral aspect of the calyx. (Illinois State collection.)

Agaricocrinus americanus, var. tuberosus (Hall) 489

4. Dorsal aspect of the calyx.

Dorycrinus cornigerus (Hall) 458

5. Specimen with arms and stem.

6. Postero-lateral view of calyx.

Dorycrinus quinquelobus Hall 460

7. Side view of the calyx ; the spines broken away.

8. Lateral view of a specimen with arms.

9. Posterior side of calyx ; the spines intact.

Dorycrinus subturbinatus Meek and Worthen 466

10a. Antero-lateral view of the calyx.

105. Posterior view of the calyx.

Aorocrinus Cassedayi (Lyon) 483

11a. Ventral aspect of the type specimen. (Lyon collection.)

115. Posterior side of the same.

12. Side view of a specimen from Alpena, Mich.

Aorocrinus concavus ( Meek and Worthen) 482

13a. Dorsal aspect of the type specimen. (Mus. Comp. Zool.)

135. Ventral aspect of the same.

13c. Side view of same.

Alloprosallocrinus conicus Lyon and Cass. 407

14a. Anterior view of the calyx.

145. Posterior view of the same.

14c. Dorsal aspect of same.

(All specimens in the collection of Wachsmuth and Springer, unless otherwise stated.)

Or ora idea Camerata.

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Dorycrinus misstssippiensis F. Eoemer 455

Fig. 1. Specimen with arms and stem. (Coll. Lisbon A. Cox.)

Dorycrinus Gouldi (Hall) 456

2. Large specimen with arms and stem. (Coll. W. and Sp.)

3. A young specimen with arms. (Same collection.)

Aorocrinus spinosulus (Hall) 478

4. Specimen with arms. (Coll. L. A. Cox.)

Dorycrinus coenigeeus (Hall) 458

5. Calyx, showing the anal side. (Coll. W. and Sp.)

Dorycrinus missouriensis (Shumard) 463

6. Posterior side of the calyx with most of the spines intact. (Same collection.)

Agaricocrinus nodulosus Worthen 497

7a. Dorsal aspect of the calyx. (Same collection.;

75. Ventral aspect of the calyx.

Agaricocrinus Whitfieldi Hall 496

8a. Dorsal aspect of the type specimen. (Illinois State collection.)

85. Ventral aspect of the same specimen.

Agaricocrinus nodosus Meek and Worthen 493

9. Calyx and portion of the arms. (Coll. W. and Sp.)

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Dorycrinus intermedius Meek and Worthen 461

Fig. 1. Specimen with arms, spines, and stem.

Dorycrinus mississippiensis Roemer 455

2. Posterior side of the calyx.

3. Ventral aspect of a specimen with long spines.

Dorycrinus Gouldi (Hall) 456

4. A specimen having the arms and portions of the spines preserved (from

Indian Creek, Ind.)

5. Anterior view of the calyx. (Specimen from Kentucky.)

Dorycrinus cornigerus (Hall) 458

6. Dorsal aspect of the calyx.

7. Ventral aspect of another specimen.

Aorocrinus spinosulus (Hall) 478

8a. Posterior side of the calyx.

8 b. Ventral aspect of the same specimen.

Eretmocrinus remibrachiatus, var. expansus W. and Sp. . . . 390

9. A large specimen, showing the calyx, anal tube, and the infolding of the
arms.

(All the specimens in the collection of Wachsmuth and Springer.)

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Aorocrinus radiatus W. and Sp 472

Fig. 1. A specimen with arms ; anterior side.

Aokocrinus iielice (Hall) 481

2. Posterior view of the type specimen. (After Hall.)

Aorocrinus parvibasis W. and Sp 473

3a. Specimen with arms from the anterior side.

35. Posterior view of the calyx.

Aorocrinus immaturus W. and Sp 471

4a. Lateral view of specimen with part of the arms, and portions of stem and

cirri preserved.

4 b. Posterior view of another specimen.

Aorocrinus helice (?) 481

5. Anterior view; from a gutta-percha cast made in the natural mould.

Aorocrinus canaliculatus M. and W 475

6a. Anterior view of the type specimen. (After Meek and Worthen.)

6b. Posterior view of the same. (After Meek and Worthen.)

Aorocrinus subaculeatus (Hall) 476

7a. Anterior view of the calyx.

7b. Posterior side of the same. (After Hall.)

Dorycrinus unicornis (0. and Sh.) 468

8a. Anterior view of a specimen with arms.

8b. The same view of a smaller specimen with part of the stem.

8c. Ventral aspect of a large calyx.

8 d. Dorsal aspect of another large calyx.

8e. Anterior view of a young specimen.

9. Posterior view of the form described by Hall as Actinocrinus tricornis.

10. The form described by Hall as Actinocrinus pendens ; anal side.

Aorocrinus parvus (Shumard) 477

11a. Specimen with arms and stem.

115. Posterior side of calyx of a large specimen.

Page

Dorycrinus unispina (Hall) 467

Fig. 12. Specimen with an unusually large spine and portions of the arms.

Dorycrinus missouriensis (Shumard) 463

13a. Anterior view of the calyx with spines intact.

13 b. Ventral aspect of the same specimen.

13c. Posterior view of another specimen.

14. An abnormal specimen ; posterior side.

Dorycrinus Rcemeri M. and W 464

15a. Anterior view of the calyx.

15 b. Posterior view of another specimen.

(All specimens, except 6 and lb, in the collection of Wachsmuth and Springer.)

PLATE XLVI.

Page

(?) Periechocrinus Whitei (Hall) 530

Pig. 1. A very large specimen from the Upper Burlington limestone. (Coll. W,
and Sp.)

2. A smaller specimen from the same bed. (Same collection.)

3. Side view of the calyx. (Same horizon, and same collection.)

(?) Periechocrinus tenuidiscus (Hall) 531

4. Lateral view of the dorsal cup. (Same collection.)

Agaricocrinus Sampsoni S. A. Miller 505

5. The type specimen. (Coll. F. A. Sampson.)

Lobocrinus .jequibrachiatus McChesney 440

6a. Specimen with only eighteen arms. (Coll. W. and Sp.)

6b. Ventral aspect of the same specimen.

Batocrinus rotadentatus Bowley and Hare 374

7. The type specimen, showing the dorsal cup. (Coll. B. B. Bowley.)

Batocrinus Calvini Bowley 373

8a. Side view of the type specimen. (Coll. B. B. Bowley.)

8b. Another view of the calyx, showing the anal interradius to the left.

Dizygocrinus euconus, var. abscissus (Bowley and Hare) . . . 431

9. Side view of the calyx. (Coll. W. and Sp.)

Dizygocrinus montgomeryensis Worthen 428

10. Type of the synonym “ Batocrinus Gurleyi ” B. and H. (Coll. B. B.

Bowley.)

Actinocrinus (?) chouteauensis S. A. Miller 570

11a. Posterior view of the type specimen. (Coll. F. A. Sampson.)

11 A Ventral aspect of the same specimen.

Crinqipea Camerata.

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PLATE XL VII.

Megistocrinus Evansi 0. and Sli,

Page

533

Fig. la. Lateral view of a large specimen.
lb. Ventral aspect of the same.

2 a. Basals and radials of a large specimen with corrugated surface.

2b. Inner floor of the anchylosed basals.

3. A medium-sized specimen with the anal opening low down.

4a. Upper part of the stem.

4 b. Its lower part.

5a. A rather small specimen of the form described by Hall as Actinocrinus
brevicornis ; anterior side.

5b. Posterior view of the same specimen.

5c. Ventral aspect of same.

Megistocrinus nobilis W and Sp 537

6. Posterior side of a large specimen with arms.

7. Ventral aspect of another specimen with arms, showing side- and covering-

plates.

8a. Showing the covering-plates and side-pieces as they enter the ventral disk
(enlarged).

8b. A portion of the same specimen, showing the covering- and side-pieces in
profile (still more enlarged).

(All the specimens are in the collection of Wachsmuth and Springer.)

OR 1 NOIDEA CAMERATA.

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PLATE XL VIII.

Megistocrinus spinosulus Lyon

Fig. la. Posterior view of the type specimen ; from Louisville. (Lyon collection.)

lb. Dorsal aspect of the same specimen.

lc. Ventral aspect of same.

2. A specimen from Columbus, 0. ; the form described by S. A. Miller as
M. pileatus. (Coll. W. and Sp.)

Megistocrinus latus Hall

3a. Ventral aspect of calyx. (Coll. A. S Tiffany.)

3b. Dorsal view of same. (The orientation of both figures incorrect.)

Megistocrinus Farnsworthi White

4 a. Dorsal view of the calyx. (Coll. W. and Sp.)

4 b. Side view of another specimen. (Same collection.)

Megistocrinus conga vus W. and Sp

5a. Dorsal view of the calyx. (Coll. W. and Sp.)

5b. Lateral view of the type specimen. (Davenport Acad. Sci.)

5c. Ventral aspect of the same specimen.

Megistocrinus rugosus Lyon and Cass

6a. Dorsal aspect of the calyx. (Coll. W. and Sp.)

6b. Ventral aspect of the type specimen. (Lyon collection.)

6c. Anterior view of a smaller specimen, showing portion of the anal tube.
(Same collection.)

Page

544

538

539

543

542

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PLATE XLIX.

Megistocrinus abnormis Lyon

Fig. la. Dorsal aspect of the calyx. (Coll. TV. and Sp.)
lb. Lateral view of the same specimen.

1 c. Ventral aspect of another specimen. (Same collection.)

Megistocrinus depressus Hall , . .

2. A specimen from Hew York. (Coll. A. S. Tiffany.)

3. Side view of a specimen from Louisville. (Coll. TV. and Sp.)

4 a. Dorsal aspect of a specimen from Hew York. (State Mus. Hat. Hist. H. Y.)
4 b. Ventral aspect of another specimen. (Same collection.)

4c. Portion of the arms. (Same collection.)

4rZ. Dorsal aspect of a small specimen from Hew York, showing the ornamenta-
tion. (Coll. TV. and Sp.)

Megistocrinus nodosus Barris . . .

5a. Lateral view of the type specimen. (Mus. Davenport Acad. Hat. Sci.)

5b. Ventral aspect of another specimen. (Same collection.)

Megistocrinus multidecoratus Barris

6. Lateral aspect of the type specimen. (Same collection.)

Page

546

540

541

542

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PLATE L.

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Periechocrinus necis (Winch, and Marcy) 524

Fig. la. Posterior side of an internal cast. (Coll. W. C. Egan.)

1 b. Ventral aspect of another cast. (Same collection.)

Periechocrinus infelix W. and M 525

2a. An interior cast in a side view. (Same collection.)

2b. Ventral aspect of an internal cast. (Same collection.)

2c. Lateral view of a specimen figured by S. A. Miller as Saccocrinus Egani.
(Same collection.)

2d. Ventral aspect of another cast, figured as S. Egani. (Same collection.)

Periechocrinus ornatus Hall and Whitf 527

3a. Gatta-perclia cast from a mould in the rock, showing surface markings;

posterior side. (After Hall and Whitfield.)

3b. Anterior view of an internal cast. (After Hall and Whitfield.)

Periechocrinus tennesseensis (Hall) 528

4. Posterior view of Rcemer’s type specimen. (After Rcemer.)

Periechocrinus urniformis (S. A. Miller) 526

5 a. Posterior view of an internal cast. (Coll. W. C. Egan.)

5b. Ventral aspect of another cast. (Same collection.)

Periechocrinus speciosus (Hall) 521

6a. The type specimen. (After Hall.)

6b. Part of an arm enlarged. (After Hall.)

Periechocrinus marcouanus (Winch, and Marcy) 523

7 a. Side view of an internal cast; anal side to the left. (Coll. W. C. Egan.)

7 b. Anterior view of the dorsal cup. (Same collection.)

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PLATE LI.

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Periechocrinus Whitfieldi (Hall) 522

g. 1. A very large and unique specimen with arms.

2a. Side view of the dorsal cup. (After Hall.)

2b. The plates of one ray, showing ornamentation. (After Hall.)

3. Posterior view of a large elongate specimen.

4. Ventral aspect of another specimen.

Periechocrinus marcouanus (Winch, and Marcy) 523

Side view of the dorsal cup.

Periechocrinus tenuidiscus (Hall) 531

6. Antero-lateral view of the dorsal cup.

Periechocrinus ornatus (Hall) 527

7. Side view of the calyx ; from St. Paul, Ind.

Megistocrinus nobilis W. and Sp 537

8. A young specimen. (Type of Megistocrinus parvus.)

Periechocrinus Whitei (Hall) 530

9. Anterior view of a large specimen with arms from the Lower Burlington

group.

10. A specimen from the Ivinderhook group of Marshall Co., Iowa.

(All specimens, except 2a and b, in the collection of Wachsmuth and Springer.)

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PLATE LII.

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Actinocrinus lobatus Hall 557

Fig. la. Ventral aspect of a large specimen.
lb. Anterior view of the same.

Actinocrinus verrucosus Hall 558

2a. A large specimen with anal tube, and portions of the arms.

2b. Posterior view of the calyx.

2c. Ventral aspect of the calyx.

Actinocrinus multi radiatus Shum 555

3. Large specimen with arms.

4 a. Posterior view of the calyx.

lb. Ventral aspect of the same specimen.

5. Lateral view of another specimen.

6. Another specimen with arms.

Actinocrinus Griffithi W. and Sp 568

7. Anterior view of the calyx.

Actinocrinus tuberculosus W. and Sp 573

8a. Posterior side of the type specimen.

8 b. The structure at the upper part of the arms.

8c. The proximal arm plates (enlarged.)

(All the specimens in the collection of Wachsmuth and Springer.)

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Actinocrinus multiramosus W. and Sp 564

Fig. 1. A magnificent specimen with arms and anal tube.

Acttnocrinus magnificus W. and Sp 567

2. A very large specimen with arms.

(Both in the collection of Wachsmuth and Springer.)

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Actinocrinus jugosus Hall 563

Fig. 1. Posterior side of a large calyx. (Coll. L. A. Cox.)

Actinockinus Lowei Hall 562

2. Lateral view of the calyx. (Same collection.)

Actinockinus lobatus Hall 557

3. Anterior view of a specimen with arms. (Mus. Comp. Zool.)

Actinocrinus trijugis (S. A. Miller) 576

4a. Posterior view of the calyx. (One of the type specimens ; in the Coll, of
F. A. Sampson.)

45. Ventral aspect of the same specimen.

Cactocrinus glans (Hall) 625

5. Posterior view of the calyx. (Coll. W. and Sp.)

6a. Lateral view of a less nodose specimen. (Same collection.)

65. Another view of the same specimen.

7. Hall’s type of Actinocrinus eryx. (Mus. Comp. Zool.)

Amphoracrinus viminalis (Hall) 590

8. Specimen with arms. (Coll. W. and Sp.)

Grins idea camerata.

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PLATE LV.

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Actinockixus lobatus Hall 557

Fig. la. Posterior view of a fine specimen; showing portions of anal tube and arms.

(Coll. W. and Sp.)
lb. Stem near the calyx.

Actixocrixus pernodosus Hall 561

2a. Anterior view of the calyx. (Same collection.)

2b. Posterior view of another specimen. (Same collection.)

Actixocrixus multiramosus W. and Sp 564

3. The calyx with an Onychaster fastened to the anal tube. (Same collection.)

Actixocrixus texuisculptus McChesney 571

4 a. Anterior side of a specimen with arms. (Same collection.)

4 b. Posterior side of the calyx. (Same collection.)

Actixocrixus scitulus M. and W 559

5. Anterior side of a specimen with arms. (Same collection.)

6a. Side view of the calyx. (Same collection.)

6b. Posterior view of the same specimen.

Actinocrixus arrosus (S. A. Miller) 577

7. One of the type specimens. (Coll. F. A. Sampson.)

8«. Dorsal aspect of the calyx. (Same collection.)

8b. Side view of the same specimen.

8c. Ventral aspect of same.

Cactocrixus obesus (Keyes) 613

9a. Side view of the type specimen. (Coll. Missouri Surv.)

9b. Ventral aspect of the same. (Coll. W. and Sp.)

Cactocrixus sexarmatus (Hall) 615

10. Left postero-lateral side of the dorsal cup. (Coll. W. and Sp )

11. Posterior view of the calyx. (Same collection.)

Cactocrixus fossatus (S. A. Miller) 620

12. The type specimen, showing the posterior side of the calyx. (After Miller.)

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Actinocrinus daphne (Hall) 574

Fig. 1. Posterior view of a large specimen. (Coll. W. and Sp.)

Cactocrinus thalia (Hall) 604

2. Specimen with arms, described by Hall as Actinocrinus infrequens. (Mas.

Comp. Zool.)

Cactocrinus thetis (Hall) 614

3. Posterior view of the calyx and anal tube. (Coll. W. and Sp.)

4. A large specimen with arms. (Same collection.)

Cactocrinus opusculus (Hall) 607

5a. Specimen with arms. (Mus. Comp. Zool.)

5b. Calyx, showing the left posterior ray and the anal interradius. (Coll.

W. and Sp.)

Cactocrinus multibrachiatus (Hall) 617

6. Antero-lateral view of the calyx. (Coll. W. and Sp.)

7. Posterior view of another specimen. (Same collection.)

Cactocrinus lucina (Hall) 603

8. Anterior view of a specimen with arms. (Mus. Comp. Zool.)

9. Posterior side of the calyx ; from near Louisiana, Mo., described by Eowley

and Hare as Actinocrinus puteatus. (Coll. E. E. Eowley.)

Cactocrinus ectypus (Meek and Wortlienj 611

10. Side view of a large specimen. (Coll. W. and Sp.)

Actinocrinus gracilis W. and Sp 572

11. A specimen with arms Q*). (Mus. Comp. Zool.)

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PLATE LVII.

Pace

Cactocrinus nodobraciiiatus W. ancl Sp 622

Fig. 1. Posterior side of a fine specimen with arms; the arms incurving and touch-

ing the summit of the disk.

2. Anterior view of another specimen.

Cactocrinus ornatissimus W. and Sp 621

3. Posterior view of the type specimen.

Cactocrinus Arnoldi W. and Sp 624

4a. Specimen with arms and pinnules (the nodes upon the arms are not pre-
served.*)

4b. Side view of the calyx, showing the left antero-lateral ray.

Cactocrinus denticulatus W. and Sp 606

5 a. The type specimen, showing the right posterior ray.

5b. Portion of an arm from near the upper end (enlarged).

Cactocrinus extensus W. and Sp 616

6. Lateral view of the calyx.

7. Specimen with arms, anal tube, and column.

Cactocrinus longus (Meek and Wortlien) 609

8. Anterior view of an unusually fine and large calyx.

Cactocrinus clarus (Hall) 612

9. Lateral view of a large dorsal cup with almost smooth plates.

10. Anterior view of a specimen with ornamented plates.

Cactocrinus reticulatus, var. ovatus (Hall) 606

11. Anterior view of the calyx.

Cactocrinus thalia (Hall) 604

12. Anterior view of the dorsal cup.

13. Another specimen, showing the left posterior ray and anal interradius.

(All the specimens in the collection of Wachsmuth and Springer.)

* This figure is misleading iu giving the appearance of spines to some arm-fragments lying upon the

disk.

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Cactocrinus clarus (Hall) 612

Fig. 1. Showing the arm structure, and the arrangement of the hooks along the
pinnules.

Cactocrinus reticulatus (Hall) 605

2a. Anterior view of the calyx.

2b. Posterior view of the calyx.

Cactocrinus proboscidalis (Hall) 601

3. A large specimen with arms.

4. Another specimen with arms.

5. Posterior view of the calyx.

6. Lateral view of a specimen, showing a portion of the anal tube.

7 a. Portion of an arm, showing the dorsal side of the pinnules and the hooks;
the food grooves open at places, and closed at others,

7b. The ventral side of the pinnules still more enlarged, showing the arrange-
ment of the covering plates and side pieces, and also at intervals the
bottom of the food grooves.

7c. Dorsal aspect of three adjoining pinnules greatly enlarged.

7 d. A single pinnule joint, greatly enlarged.

Cactocrinus multibrachiatus (Hall) . 617

8. Anterior side of a fine specimen with arms.

Cactocrinus limabrachiatus (Hall) 608

9. Lateral view of the calyx (one of the rays abnormal, having but one costal).
lOa. Specimen with arms.

10&. Arm joints, much enlarged.

(All the specimens in the collection of Wachsmuth and Springer.)

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Teleiocrinus rudis (Hall) 630

Fig. 1. Specimen with arms and stem.

2. Anterior view of a specimen with arms, anal tube, and stem.

3. Lateral view of the calyx (a very large specimen).

Teleiocrinus adolescens W. and Sp 635

4. Side view of the type specimen.

\

Teleiocrinus tenuiradiatus (Hall) 634

5. Dorsal aspect of a specimen with arms.

6. Anterior side of a large calyx.

Teleiocrinus umbrosus (Hall) 628

7. Portion of the stem.

Cactocrinus c^latus (Hall) 618

8. Lateral view of the calyx ; typical form.

9. Posterior view of a slightly lobed specimen.

Cactocrinus c^elatus, var. spinotentaculus (Hall) 619

10. Anterior view of the calyx.

(All specimens in the collection of Wachsmuth and Springer.)

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Strotocrinus glyptus (Hall) 640

Fig. la. Specimen with arms and stem.

lb. Posterior view of a very large specimen.

1 c. Ventral aspect of a natural cast.

Teleiocrinus umbrosus (Hall) 628

2 a. A fine specimen with arms and stem.

2b. Anterior view of the calyx (typical form).

2c. Ventral aspect of another specimen.

2d. A very young specimen ; the rays free above the distichals.

Teleiocrinus liratus (Hall) . 633

3. A large specimen with anal tube and stem.

Teleiocrinus althea (Hall) 632

4. Anterior view of a large calyx.

Actixocrinus asperrimus M. and W 575

5. Posterior view of the calyx.

6. Anterior side of the calyx (specimen with unusually strong ridges).

(All the specimens in the collection of Wachsmuth and Springer.)

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PLATE LXI.

Steganockinus sculptus (Hall)

Fig. la. Posterior view of a large specimen with arms, anal tube, and stem.

lb. Lateral view of a very large calyx.

lc. Posterior view of another calyx.

ld. Young specimen with arms and column.

le. Portion of one of the tubular appendages, showing the bases of the arms (f).
1 f. Cross-section of the same (f ).

Steganocrinus araneolus M. and W

2a. Dorsal aspect of a specimen with arms.

2b. Lateral view of the calyx, and the lower end of the anal tube.

Steganocrinus pentagonus (Hall)

3a. Ventral aspect of a specimen, showing portions of the arms.

3b. Anterior view of a large calyx.

3 a. Ventral aspect of the same specimen.

3d. Distal face of the first distichal (enlarged).

3e. Posterior view of a smaller specimen with more regularly arranged covering
pieces.

4a. Posterior view of a specimen from New Mexico.

4b. Ventral aspect of the same specimen.

Steganocrinus concinnus (Sliumard)

5a. Lateral view of the calyx.

5b. Ventral aspect of a small specimen.

Steganocrinus globosus W. and Sp

6. Lateral view of the type specimen.

Page

583

581

579

582

585

(All specimens in the collection of Wachsmuth and Springer.)

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Amphoracrinus spinobrachiatus (Hall) 591

Fig. 1. Dorsal aspect of a specimen with a portion of the arms.

2. Side view of a specimen with arms.

3. Lateral view of the calyx.

4. Dorsal aspect of the calyx, showing the ornamentation.

Amphoracrinus divergens (Hall) 588

5. Dorsal aspect of a somewhat distorted specimen with arms.

6a. Dorsal aspect of a fine specimen with spreading arms.

6b. A forked oral spine of this specimen.

7 a. Posterior view of a fine specimen, showing the arms and spines surrounding
the anus. (The specimen was described by Meek and Worthen as A. diver-
gens, var. viultiraviosus.')

lb. Ventral aspect of the same specimen, showing the oral and anal spines.

8a. Side view of a very small specimen, showing the oral spines.

8b. Dorsal aspect of the same specimen.

Sc. Ventral aspect of the same, showing the oral and anal spines.

9. Posterior view of the calyx.

10. Lateral view of the calyx, showing lower part of anal tube.

(Figs. 5, 7a, and 7b were made from specimens in the collection of the Mus.
Comp. Zool. ; the others are in the collection of Wachsmuth and Springer.)

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PLATE LXIII.

PlIYSETOCRINUS ORNATUS (Hall)

Fig. 1. Antero-lateral view of a specimen with arms. (Coll. W. and Sp.)

2. Posterior view of the calyx. (Same collection.)

3. Ventral aspect, showing annular impression made by a Capula, which covered

the anal opening. (Same collection.)

4. Anterior view of a large, slightly crushed specimen. (Same collection.)

Piiysetocrinus Copei (Miller)

5. Side view of large specimen. (Same collection.)

Physetoceinus ventricosus (Hall)

6. Type of the variety internodkis Hall. (Mus. Comp. Zool.)

Physetocrinus asper Meek and Worthen

7 a. Posterior view of the type specimen. (Mus. Comp. Zool.)
lb. Ventral aspect of the same.

Physetocrinus lobatus W. and Sp

8 a. Side view of the calyx. (Coll. W. and Sp.)

8b. Ventral aspect of the calyx. (Same collection.)

Teleiocrinus ALTHEA (Hall)

Lateral view of the type specimen. (Mus. Comp. Zool.)

Page

597

598
593
596

599
632

9.

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PLATE LXIV.

Fig. 3.
2,

3.

4.

5.

6.
7.

8a.

8b.

9.

10.

Page

Physetocrinus ventricosus (Hall) 593

Specimen with arms, stem, and root.

Lateral view of the calyx.

Anterior view of the calyx.

Posterior view of a small elongate specimen.

Dorsal aspect of a depressed specimen of Hall’s variety “ Actinocrinus ” reti-
culatus.

Anterior view of the calyx.

Anterior view of a specimen of the type of McChesney’s “ Actinocrinus”
subventricosus.

Specimen from the Lower Burlington limestone.

Ventral aspect of the same specimen.

Physetocrinus dilatatus M. and W 595

The type specimen. (After Meek and Worthen.)

Dorsal aspect of another specimen.

(All specimens, except Fig. 9, in the collection of Wachsmuth and Springer.)

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Strotocrinus regalis (Hall) 638

Fig. 1 a. Lateral view of the calyx.

lb. Half of a ray to the fifth bifurcation, drawn from a large specimen.

1 c. The extended rim of a large specimen, having portions of the dorsal cup
broken away, exposing the subtegminal galleries at the inner floor of the
tegmen, and the grooves passing out from the centre and diverging to the
arms.

Id. Specimen showing the outer face of the tegmen.

Strotocrinus glyptus (Hall) 640

2«. Dorsal aspect of a medium sized specimen.

2b. Tegmen of another specimen.

(All specimens in the collection of Wachsmuth and Springer.)

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Platycrinus hemisphericus M. and W 703

Fig. la. Specimen showing arms and stem.

lb. Dorsal aspect of another specimen with arms spreading, and a Platyceras
infundibulum covering anal opening.

1 c. Lateral view of the calyx ; also a Platyceras infundibulum attached.

Id. Ventral aspect of another specimen.

Platycrinus subspinulosus Hall 684

2a. Lateral view of the dorsal cup ; a very large specimen.

2b. Base of the same specimen.

Platycrinus verrucosus White 705

3a. Lateral view of the dorsal cup.

3b. Dorsal aspect of the same.

Platycrinus excavatus Hall 718

4. A specimen with arms. (The figure does not show sufficiently the abrupt
depressions on the radials just below their facets.)

Platycrinus nodo-striatus W. and Sp 698

5a. Dorsal aspect.

5b. Side view of a somewhat depressed specimen.

Platycrinus Yandelli 0. and Sli 706

6a. Dorsal aspect of a specimen with arms.

6b. Posterior view of calyx.

6c. Ventral aspect of the same specimen.

Platycrinus spinifer W. and Sp 708

7. The type specimen witli arms.

Platycrinus ornigranulus McChesney 701

8. A specimen with arms.

Platycrinus subspinosus Hall 717

9a. Dorsal aspect of a perfect specimen with arms. (Mus. Comp. Zool.)

9b. Ventral aspect of the calyx.

Platycrinus discoideus O. and Sh 713

10a. Dorsal aspect of a specimen with arms, the outer parts of the latter slightly
restoi-ed in two rays.

106. Ventral aspect of the calyx.

10c. Posterior side of the same specimen.

(All specimens, except Fig. 9a, in the collection of Wachsmuth and Springer.)

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Platycrinus Saffordi Hall C94

. 1. A fine specimen with arms and column, from Indian Creek, Ind. (Coll.

W. and Sp.)

2. Side view of the calyx. (Same collection.)

3. Dorsal cup of a specimen from Burlington. (Same collection.)

Platycrinus glyptus M. and TV 693

4. Specimen with arms and column. (Coll. W. and Sp.)

5. Dorsal cup of a large, elongate specimen. (Same collection.)

Platycrinus incomptus White 664

6. A young specimen with arms, showing the numerous bifurcations of the rays,

and a faint rugose ornamentation.

Platycrinus spinifer, var. elongatus W. and Sp 709

7. Lateral view of the calyx, showing portions of the arms. (Same collection.)

Platycrinus cavus Hall 715

8a and b. Dorsal cup of two specimens. (Same collection.)

Platycrinus Wortheni Hall 702

9. The type specimen. (Illinois State collection.)

Platycrinus geometricus W. and Sp 697

10. The type specimen. (Mus. Comp. Zool.)

Platycrinus truncatulus Hall 675

Ha. Side view of the calyx, showing the bases of the arms (enlarged).
lib. Side view of another specimen.

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Crinoidea Camerata.

Plate LXVI1I.

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PLATE LXVIII.

AGE

Platycrinus verrucosus White 705

g. la. The type specimen. (Mus. Comp. Zool.)

lb. Oblique view of the dorsal cup. (Coll. W. and Sp.)

1 c. Another specimen ; dorsal aspect of the calyx. (Same collection.)

Id. Lateral aspect of a variety from New Mexico, showing the anal opening.
(Same collection.)

Platycrinus pocilliformis ITall 706

2a. Lateral aspect of the dorsal cup (the ornamentation from another specimen).

(Coll. W. and Sp.)

2b. Base of a specimen with larger nodes. (Coll. W. and Sp.)

Platycrinus Yandelli 0. and Sh 706

3a. Dorsal aspect of the calyx ; a very mature specimen. (Same collection.)

3b. Ventral aspect of the same specimen.

3c. Posterior view of same.

Platycrinus Yandelli, var. perasper 708

4 a. Lateral view of a specimen with arms. (Mus. Comp. Zool.)

4b. Dorsal aspect of the same specimen (the stem removed).

Platycrinus sculptus Hall 691

5. Specimen from New Mexico, lateral view of the calyx. (Coll. W. and Sp.)

Platycrinus parvinodus Hall 696

Ga. Side view of the type, the specimen somewhat flattened. (Mus. Comp.

Zool.)

Gb. Anterior view of another specimen less distorted. (Coll. W. and Sp.)

Platycrinus peculiaris W. and Sp 700

7 a. Posterior view of the calyx; the nodes partly eroded by weathering. (Coll.

W. and Sp.)

7 b. Ventral aspect of the same specimen.

Platycrinus geometricus W. and Sp 697

8. Another type specimen. (Coll. W. and Sp.)

Platycrinus asper M. and W

Fig. 9 a. The type specimen. (Mus. Comp. Zool.)

9b. Basal view of another specimen. (Mus. Comp. Zool.)

Platycrinus ornigranulus McCh

10a. A fine specimen with arms, representing the typical form. (Mus. Comp.
Zool.)

10A Dorsal aspect of a very short calyx ; showing the ornamentation. (Coll.
W. and Sp.)

10c. A costal and two pairs of distichals.

11a. A specimen with coarser ornamentation. (Same collection.)

11 b. A specimen with a somewhat different ornamentation. (Same collection.)
12a. A young specimen. (Coll. W. and Sp.)

12 b. A still smaller specimen Q}). (Same collection.)

Platycrinus eminulus Hall

13a. Anterior view of calyx. (Mus. Comp. Zool.)

13 b. Posterior view of another specimen. (Same collection.)

13c. Ventral aspect of the calyx. (Coll. W. and Sp.)

Platycrinus scobina M. and W

14a. The type specimen. (Mus. Comp. Zool.)

14A Dorsal aspect of the calyx. (Coll. W. and Sp.)

Platycrinus Gorbyi S. A. Miller

Page

690

701

712

695

716

15. Dorsal aspect of the calyx. (Mus. Comp. Zool.)

\

LIBRARY

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PLATE LXIX.

Page

Platycrinus si'mmetricus W. and Sp 655

g. la. Specimen with arms and column.

lb. Ventral aspect of the calyx ; a large specimen.

lc. Ventral aspect of a young specimen ; the orals almost symmetrical.

Platitcrinus planus 0. and Sh 668

2 a. A large specimen with arms.

2b. Lateral view of the dorsal cup.

2c. A portion of the arms enlarged.

2 d. A young specimen, apparently of this species.

Platycrinus burlingtonensis 0. and Sh 653

3a. A medium sized specimen with arms. (After Meek and Worthen.)

3b. Lateral view of a large calyx.

3c. Ventral aspect of another large specimen, showing the anal tube.

3d. Posterior view of a smaller specimen.

3e. Ventral aspect of another small specimen.

3 f. Dorsal cup of a young specimen. (Inadvertently drawn with left antero-
lateral interradius at the top.)

3 g. A very young specimen with zigzag arms, composed of single joints.

3 h. Portion of an arm showing the lateral processes (enlarged).

3 i. Portion of an arm in a dorsal aspect (enlarged).

Platycrinus Agassizi W. and Sp 669

4. A very large specimen with arms.

Platycrinus pileiformis Hall 656

5. A specimen with arms (slightly restored).

Platycrinus boncensis White 683

6. A specimen having six arms to the ray.

Platitcrinus sar.e Hall 077

7. The type specimen. (After Hall.) Somewhat flattened.

(All specimens in the collection of Wachsmuth and Springer, except that of 3a,
which is in the Museum of Comparative Zoology, and Fig. 7, which is in the
Illinois State Museum.)

Grinoidea Camerata.

Plate LXIX

/ ((■

,3a

3c

V

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PLATE LXX.

Page

Platycrinus sar,e Hall 677

. 1. Specimen with faintly ornamented plates.

Plata^crinus nodo-striatus W. and Sp 698

3. Specimen with six to the ray, the most frequent number.

4 a. Lateral view of the calyx ; an older specimen.

4 b. Anal side of the same specimen.

4c. Ventral aspect of same.

Platycrinus brevinodus Hall 688

2. Specimen from the upper part of the Burlington limestone ; with column,
root, and four arms to the ray.

5. Specimen from same horizon with six arms to the ray.

6a and b. Two specimens from the Keokuk group of Indian Creek, Ind.

Platycrinus tenuibraciiiatus Meek and Worth 687

7. A specimen with arms.

8. Another specimen, slightly differing in ornamentation.

Platycrinus subspinulosus Hall 684

9. A highly ornamented calyx.

Platycrinus Sampsoni S. A. Miller 673

10. Lateral view of the calyx.

Platycrinus Pratteni Worthen 671

11. A specimen with arms.

12. The basal disk.

Platycrinus pileiformis Hall 656

13a. Lateral view of the calyx.

135. Posterior side of the calyx.

Platycrinus Davisi W. and Sp 684

14. Lateral view of the type specimen.

(All the specimens in the collection of Waclismuth and Springer.)

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CRINOIDEA GaMERA'IA.

Plate LXXI

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PLATE LXXI.

Page

Platycrinus incomptus Wliite 6G4

Fig. 1. A very large specimen, showing the numerous ramifications of the arms.

(Coll. W. and Sp.)

2. A small specimen, showing the same. (Same collection.)

3. The type specimen. (Mus. Comp. Zool.)

Platycrinus .equalis Hall 674

4a. A very large specimen with arms. (Same collection.)

4b. Portion of an arm (enlarged).

5. The calyx, showing the radial facets and the small first costal. (Coll. W.

and Sp.)

Platycrinus lodensis Hall and Wliitf 666

6. The type specimen. (After Hall and Whitfield.)

Platycrinus graphicus Hall and Whitf 672

7. The type specimen. (After Hall and Whitfield.)

Platycrinus contritus Hall and Whitf 667

8. The type specimen. (After Hall and Whitfield.)

Platycrinus niotensis Meek and Worthen 682

9. Specimen with arms (from Indiana).

Platycrinus Brittsi S. A. Miller 659

10. The type specimen. (Coll. F. A. Sampson, Sedalia).

Platycrinus corbuliformis Rowley and Hare 657

11 a. Dorsal cup in a side view.

115. Dorsal aspect of the same specimen. (Coll. R. R. Rowley.)

Platycrinus .equiternus S. A. Miller 658

12. The type specimen. (Coll. F. A. Sampson.)

Platycrinus pisum Rowley and Hare 660

13a. The type specimen ; posterior view. (Coll. R. R. Rowley.)

135. Dorsal aspect of same.

Page

Platycrinus quinquenodus White 661

g. 14a. The type specimen ; lateral view of calyx. (Mus. Comp. Zool.)

14A Ventral aspect of same.

14c. Dorsal aspect of same.

Platycrinus insolens Eowley and Hare 659

15. The type specimen. (Coll. E. E. Eowley.)

Platycrinus peculiaris W and Sp 700

16. The type, a rather large example. (Coll. W. and Sp.)

Platycrinus allophylus S. A. Miller 685

17. The type specimen. (Coll. F. A. Sampson.)

Platycrinus truncatulus Hall 675

18a. Dorsal aspect of the calyx. (Coll. W. and Sp.)

18&. Side view of the dorsal cup.

LIBRARY”

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PLATE LXXII.

Page

Platycrinus regalis Hall 710

Fig. 1. Specimen with arms, stem, and root. The calyx of this specimen is much
distorted by pressure, and the surface ornamentation obscure, so that in
some of the characters it gives an incorrect impression, and does not
represent a typical example of the species. (Coll. W. aud Sp.)

2. The type specimen. (Mus. Comp. Zool.)

Eucladocrinus tuberosus (Hall) 728

3. Specimen, showing the small branching arms given off from the tubular

appendages. (Coll. W. and Sp.)

4 a. Posterior side of the calyx. (Same collection.)

4 5. Dorsal aspect of the same specimen.

4c. Ventral aspect of same.

Eucladocrinus montanensis Meek 723

5. The type specimen. (National Museum at Washington.)

Platycrinus Halli Shumard 662

6«. Specimen with arms and stem. (Coll. W. and Sp.)

65. Portion of an arm, enlarged.

la. Posterior side of the calyx. (Same collection.)

lb. Ventral aspect of the same specimen.

Platycrinus boonvillensis S. A. Miller 681

8n. The type specimen, showing the dorsal cup. (After Miller.)

85. Dorsal aspect of the base. (Coll. W. and Sp.)

9. Another specimen. (Coll. F. A. Sampson.)

Platycrinus ornigranulus McCh 701

10. Basal disk, showing the ornamentation.

Marsupiocrinus pr^maturus (Hall and Whitf.) 734

11«. Side view of the type specimen.

115. Dorsal aspect of the same. (After Hall and Whitfield.)

Crinoidea Gamer ata.

Ghas.R.Keyes J.L.Ridgway del .

UNIVERSITY of ILLINOIS.

PLATE LXXIII.

Page

Eucladocrinus millebrachiatus W. and Sp 720

g. 1. A large specimen ; the tubular appendages hanging over the calyx.

Eucladocrinus millebraciiiatus, var. immaturus W. and Sp. . . 722

2. Dorsal view of a small specimen ; the tubular appendages directed

horizontally.

3. Ventral aspect of a larger specimen, showing the bases of the arms.

Eucladocrinus pleurovimineus (White) 724

4. A large specimen, showing the dorsal side of the calyx.

Eucladocrinus pr^nuntius W. and Sp 723

5. One of the type specimens, showing calyx and portions of the arms.

Platycrinus huntsvill.e (Troost) W. and Sp. . 678

6. A large specimen with inflated arms ; the plates of the calyx not ornamented.
7a. Another mature specimen with ornamented calyx plates, the arms gradually
tapering.

lb. A portion of one ray enlarged, showing the spinous processes at the sides of
the arm plates, the waving suture lines between the lower brachials, and
the arrangement of the pinnules (f).

8b. An immature specimen; the arms uniserial to nearly one half of their
length (}!).

9. A more mature specimen (}-*)•

10. A very young specimen, the arms composed of comparatively elongate plates,

and uniserial almost to their tips (f).

11. The base of a highly ornamented specimen.

12. The base of a smooth specimen.

(All the specimens in the collection of Wachsmuth and Springer.)

Crinoidea Camerata.

Plate LXXIII.

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PLATE LXXIV.

Eucladocrinus pleurovimineus (White)

Fig. 1. A magnificent specimen, showing the calyx, the tubular appendages, arms,
and column.

Eucladocrinus millebrachiatus W. and Sp

2. A moderately large specimen, showing the dorsal side of the calyx, tubular

appendages, and arms.

3. Side view of the calyx.

4. Ventral aspect of a fine specimen, showing the rigid covering pieces of the

tubular appendages, and the ventral furrows along the arms.

5. Lateral view of one of the tubular appendages, showing the arm openings,

and the respiratory pores at the base of the arms.

6. Cross section of an appendage, showing the central cavity.

7. The appendage with the covering pieces removed.

8. Distal face of a stem joint from near the calyx, showing the transverse ridge,

and the minute axial canal.

9. Portion of an arm enlarged, showing the pinnules.

Page

724

720

(All the specimens in the collection of Wachsmuth and Springer.)

Chino idea Camerata.

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Grinoidea Carter ata.

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PLATE LXXV.

Page

Camptocrinus myelodactylus W. and Sp 779

Fig. 1. A specimen with stem and cirri. (Coll. W. and Sp.)

2* and b. Portions of the coiled stem in different specimens, showing the cirri.

Dichocrinus Blairi S. A. Miller 778

3. The type specimen. (After Miller.)

Dichocrinus huntsvillae W. and Sp 773

4. The type specimen. (Coll. W. and Sp.)

Dichocrinus cinctus S. A. Miller 764

5. Specimen with arms. (Same collection.)

Dichocrinus conus Meek and Worthen 770

6. The type specimen. (Illinois State collection.)

Platycrinus canaliculatus Hall 689

7 a. Specimen with arms. (Coll. W. and Sp.)
lb. Dorsal aspect of the calyx. (Same collection.)

Platycrinus sculptus Hall 691

8. A large specimen with arms. (Same collection.)

9. A smaller specimen. (Mus. Comp. Zool.)

Platycrinus americanus 0. and Sli 686

10. A mature specimen with arms; the latter biserial from above the last bifur-

cation. (Coll. W. and Sp.)

11. A young specimen ; the arms uniserial and zigzag, the joints elongate, and

the pinnules far apart. (Same collection.)

12. Dorsal aspect of the calyx. (Same collection.)

13a. Side view of the calyx of a large specimen. (Same collection.)

13 b. Anal side of the same specimen.

13c. Ventral aspect of the same.

14. Natural cast, probably of Culicocrinus

From the Niagara group of Iowa. (Same collection.)

735

Page

Coccocrinus bacca F. Roemer 739

'is?. 15a. Dorsal aspect of the calyx (drawn with the anal interradius at the lower
left side).

1 56. Right anterior side of the same specimen.

15c. Posterior side of same. (Same collection.!

Marsupiocrinus tennesseensis (F. Roerner) 731

16a. Dorsal view of the calyx. (Coll. W. and Sp.)

166. Ventral aspect of the same specimen.

Marsupiocrustus striatus W. and Sp 732

17. Dorsal view of a rather small specimen. (Same collection.)

18. Ventral aspect of another specimen.

Marsupiocrinus tentaculatus (Hall) 733

19a. The type specimen. (After Hall.)

196. Enlargement of one of its rays. (After Hall.)

Cordylocrinus plumosus (Hall) 737

20. The type specimen. (After Hall.)

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Plate LXXYT.

Crinoidea Camerata.

PLATE LXXYI.

Page

Arthracantiia ithacensis Williams 749

Fig. la. Lateral view of a specimen with arms. (Museum Cornell University.)
lb. Basal disk.

1 c. The movable spines upon the tegmen.

Arthracantiia punctobrachiata Williams 750

2a. Specimen showing spine bases. (Coll. W. and Sp.)

2b. Another specimen with some spines attached. (Coll. Prof. S. Calvin.)

Arthracantiia depressa W. and Sp 751

3a. Dorsal aspect of the type specimen. (Coll. W. and Sp.)

3b. Ventral aspect of the same specimen.

Diciiocrinus lineatus Meek and Worthen 761

4 a. The type specimen ; posterior view of the calyx. (Mus. Comp. Zool.)

4 b. Anterior view of the same specimen.

4c. Dorsal aspect of same.

Dichocrinus pisum Meek and Worthen 763

5. Specimen with arms. (Mus. Comp. Zool.)

Dichocrinus crassitestus White 769

6a. The type specimen ; the anterior side exposed. (Same collection.)

6l>. Another specimen with part of the column attached. (Coll. W. and Sp.)

6c. Posterior view of the calyx and anal tube. (Same collection.)

Dichocrinus ovatus Owen and Shumard 760

7. A fine specimen with arms. (Mus. Comp. Zool.)

Dichocrinus liratus Hall 759

8. Specimen with arms and part of column. (Same collection.)

Dichocrinus coxanus Worthen 763

9. The type specimen. (Coll. L. A. Cox.)

Dichocrinus hamiltonensis Worthen 772

10. The type specimen. (Same collection.)

Page

Diciiocrinus angustus White 708

Fig. 11. Posterior view of a specimen with arms. (Coll. W. and Sp.)

Dichocrinus superstes W. and Sp 766

12. Side view of the type specimen. (Same collection.)

Camptocrinus cirrifer W. and Sp 780

13a. The type specimen, showing the carved cirrus-bearing stem ; from the
Kaskaskia group of Kentucky. (Coll. W. and Sp.)

13 b. Another specimen from the Kaskaskia group. (Same collection.)

13c. A specimen from the St. Louis group of Huntsville, Ala. (Same collection.)

CR I NO IDEA CAMERATA.

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PLATE LXXVII.

Page

Dichocrinus polydactylus Cass, and Lyon 756

la. A large specimen with arms.

lb. Posterior view of calyx, showing the elevated dome and disk ambulacra.

Dichocrinus lachrymosus Hall 754

2 a. Specimen with arms and stem.

2b. Posterior view of calyx.

2c. Ventral aspect of same.

Dichocrinus liratus Hall 759

3 a. Specimen showing the arms and stem.

Zb. Posterior view of the dorsal cup.

Dichocrinus cinctus Miller and Gurley 764

4 a. Posterior view of specimen with arms.

4 b. Ventral aspect of the calyx.

4c. Distal face of first distichal (f).

Dichocrinus plicatus Hall 758

5a. A small specimen with arms and stem.

5b. Another specimen, giving a side view of the dorsal cup.

Dichocrinus ornatus W. and Sp 762

6. Specimen with arms and stem, from near Mt. Pleasant, Iowa.

Dichocrinus iaevis Hall 765

7a. Specimen with arms. (Coll. Mr. Fultz of Burlington.)

7b. Another specimen. (Same collection.)

7c. Portion of an arm with pinnules (enlarged).

Dichocrinus ovatus 0. and Sh 760

8a. A specimen with arms.

85. Posterior view of the dorsal cup.

Dichocrinus oblongus W. and Sp 759

9. Posterior view of the type specimen.

Page

Dichocrinus pisum M. and W 763

Fig. 10. Posterior side of the dorsal cup. (After Meek and Worthen.)

Dichocrinus stiuatus 0. and Sh 757

11a. Posterior side of the dorsal cup.

115. Side view of another specimen.

Dichocrinus inornatus W. and Sp 770

12a. Posterior view of a specimen with arms.

125. Another specimen.

Dichocrinus delicatus W. and Sp 766

13. The type specimen.

(All the specimens, except la, 5 and 10, are in the collection of Wachsmuth

and Springer.)

Cr ino idea Gamer ata.

Plate LXXVIII

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PLATE LXXVIII.

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Talarocrinus sexlobatus (Shumard) 784

Fig. la. Posterior view of a specimen from Flagpont, Va. (y5). (Coll. W. and Sp.)
lb. Ventral aspect of the same specimen
1 c. Dorsal view of the calyx. (Coll. W. and Sp.)

Talarocrinus ovattjs Worthen 787

2a. Posterior view of the type specimen (j5). (Illinois St. Coll.)

2b. Ventral aspect of the same specimen (y5).

Talarocrinus decornis W. and Sp 788

3a. Posterior view of the type specimen (y5 ). (Coll. W. and Sp.)

3b. Ventral aspect of the same (y5 ).

3c. Specimen with arms (y5)- (Same collection.)

Talarocrinus symmetricus (Cass, and Lyon) 786

4 a. Posterior view of the calyx (y5). (Coll. W. and Sp.)

4 b. Ventral aspect of the same specimen Qf).

5. Posterior view of type (y5). (Coll. S. S. Lyon.)

Talarocrinus cornigerus (Shumard) 783

6a. Posterior view of a specimen from Pulaski Co., Ky. (Coll. W. and Sp.)

6b. Ventral aspect of the same specimen (y5).

7a. Anterior view of the type specimen, from Alabama (\5). (Mus. Washington
University, St. Louis.)

7b. Ventral aspect of the same Qf).

Talarocrinus simplex (Shumard) 790

8a. Anterior view of the dorsal cup (’y5). (Coll. W. and Sp.)

8b. Dorsal aspect of a larger specimen. (Same collection.)

Talarocrinus sp. (?)

9a. Posterior view of a specimen from Pulaski Co., Ky. (’y5). Perhaps an ab-
normal specimen of T. sexlobatus. (Coll. W. and Sp.)

95. Oral plates of the same (’y5).

Hexacrinus occidentalis W. and Sp

10. Anterior view of the type specimen. (Mus. Davenport Atad. Nat. Sci.)

745

Dichocrinus pentalobus (Cass, and Lyon)

Fig. 11a. Lateral view of the type specimen ; somewhat crushed. (Coll. S. S. Lyon.)
11&. The fixed brachials, enlarged (f).

11c. An imperfect specimen, showing parts of the pendant arms. (Coll. S. S.
Lyon.)

Hexacrinus Leai (Lyon)

12tt. Anterior view of type; the lower brachials and a few joints of the stem
restored from another specimen. (Coll. S. S. Lyon.)

12 b. Basal cup of same specimen.

Dichocrinus scitulus Hall

13a. Side view of a large specimen with arms, from the Lower Burlington lime-
stone. (Coll. W. and Sp.)

13A A small specimen from the Upper Burlington limestone. (Same collec-
tion.)

14. Side view of a specimen with arms from the same horizon. (Same collec-
tion.)

Dichocrinus pendens W. and Sp

15. Specimen with pendent arms from the Upper Burlington limestone. (Coll.
W. and Sp.).

Dichocrinus ficus Cass, and Lyon

16a. Posterior view of the calyx. (Coll. W. and Sp.)

16A Side view of another specimen. (Same collection.)

Page

775

746

767

774

774

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Plate LXX1X.

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PLATE LXXIX.

Talarocrinus subglobosus W. and Sp

Fig. la. Posterior view of the calyx. (Coll. W. and Sp.)
lb. Ventral aspect of the same specimen.

Pterotocrinus depressus Lyon and Cass

‘2a. Lateral view of the type specimen. (Coll. S. S. Lyon.)

2b. Lateral view of the calyx, showing two of the wings. (Coll. W. and Sp.)

2c. Dorsal aspect of the calyx. (Same collection.)

2d. Another type specimen, showing the wings in position. (Coll. S. S. Lyon.)
2e. A wing, showing the face of attachment.

Pterotocrinus acutus Wetherby

3a. Posterior view of the calyx. (Coll. W. and Sp.)

3b. Anterior view of the same specimen.

3c. Ventral aspect of a specimen with two of the wings preserved, and the anus
covered by a Gasteropod. (Same collection.)

3d. Another specimen, showing the wings in a side view. (Same collection.)

3c. Dorsal aspect of a fine specimen with arms and wings. (Same collection.)

3/ and g. 2 wings of a different species. (Same collection.)

Pterotocrinus pyramidalis Lyon and Cass.

4a. The type specimen; lateral view of the calyx. (Coll. S. S. Lyon.)

4 b. Dorsal aspect of the* same specimen.

Pterotocrinus ciiesterensis Meek and Worthen

5a. One of the type specimens; lateral aspect. (After Meek and Worthen.)

5b. Another type specimen, showing the posterior side of the calyx. (After
Meek and Worthen.)

Pterotocrinus capitalis Lyon

6a. Postero-lateral view of the type specimen. (Coll. S. S. Lyon.)

Gb. Ventral aspect of the same.

Pterotocrinus coronarius Lyon

7a. Ventral aspect of the type specimen. (Same collection.)

7b. Side view of the same ; the dorsal cup not preserved.

Pare

789

796

799

798

802

794

795

Page

Pterotocrinus crassus Meek and Worthen i . 801

Pig. 8. Posterior view of the type specimen. (After Meek and Worthen.)

Pterotocrinus acutus, var. bifurcatus Wetherby 801

9a. Dorsal aspect of the type specimen. (After Wetherby.)

9&. Ventral aspect of the same.

10. Diagram, showing the arrangement of the lower brachials in Pterotocrinus.

PLATE LXXX.

Page

Acrocrinus Shumardi Yandell 806

Fig. 1. Lateral view of the type specimen. (Dr. Yandell’s collection.)

2. Fragmentary specimen from Huntsville, Ala. (Coll. W. and Sp.)

3. The lower part of the dorsal cup ; from Pulaski Co., Ky. (Coll. W. and Sp.)

Acrocrinus amphora W. and Sp 808

4. A large specimen with portions of the arms and stem.

5. A smaller specimen, enlarged (f).

6. The calyx somewhat flattened and enlarged (f).

The right posterior ray forming the median line of figure ; the anal inter-
radius occupying the left side.

7. Another specimen showing calyx and lower part of the arms (|).

8. Ventral aspect of a large specimen (f).

9. A specimen showing the calyx, the pendent arms, the turned up pinnules, and

the stem.

(All in the collection of W. and Sp. )

Acrocrinus Wortheni Wachsmutli 807

10a. Diagram made from the type specimen in the Illinois State Museum.

106. Showing the outlines of the specimen.

Crinoidea Camerata.

Plate LXXX.

10 a

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PLATE LXXXI.

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Eucalyptocrinus crassus Hall 342

'ig. 1. A very large specimen with arms. (Coll. W. and Sp.)

2. A smaller specimen with arms. (Same collection.)

3. Calyx with arms removed, leaving the partitions enclosing the arms. (Same

collection.)

4. A specimen with an unusually broad base. (Same collection.)

5. Ventral view of calyx with arms and partitions removed, showing the places

for the attachment of the arms. (Same collection.)

G. Showing the inner floor of the disk. (Same collection.)

14. Inner floor of the third ring of plates in the disk, enlarged. (After Hall.)

15. One of the plates of the third ring, enlarged.

Eucalyptocrinus Elrodi S. A. Miller 339

7 a. A perfect specimen with arms, from Waldron, Inch (Mus. Comp. Zool.)
lb. Basal aspect of the same.

8. A specimen from Hartsville, Ind., covered with elongate nodules. (Coll. W.

and Sp.)

9. Another specimen, showing the calyx and partition walls. (Same collection.)

10. Another, showing the plates which form the partitions. (After Hall.)

11. The plates covering and surrounding the anus. (Coll. W. and Sp.)

12. The plates constituting the ventral disk. Those forming the two lower rings

showing the inner floor, those of the two upper the outer surface. (After
Hall.)

13. Inner floor of basals and radials. (After Hall.)

Or INOIBjEA Camerata.

Plate L '/Ml

J. L.Ridgway del .

HeH&type printing Ci).,Boston.

PLATE LXXXII.

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Eucalyptocrinus ovalis Hall 344

Fig. 1. Stem and root. (Coll. W. and Sp.)

2. Specimen with arms and part of stem. (Same collection.)

3. Another specimen showing the partition walls. (Same collection.)

4. A specimen with arms. (Same collection.)

5. Showing the arm facets. (Same collection.)

6. Showing the basals. (Same collection.)

Eucalyptocrinus magnus Worthen 348

7. Dorsal aspect of the calyx. (After Worthen, the basals corrected.)

8. Side view of Miller’s type of E. Gorbyi. (After Miller.)

Eucalyptocrinus Lindahli W. and Sp 347

9. A fine specimen with arms. (Illinois State Collection.)

Eucalyptocrinus ornatus Hall 340

10. Internal cast of the dorsal cup. (Coll. W. and Sp.)

Eucalyptocrinus Egani S. A. Miller 352

11. Internal cast of the calyx. (Coll. W. and Sp.)

12. The anal tube. (Coll. W. C. Egan.)

Eucalyptocrinus turbinatus S. A. Miller 351

13. Internal cast of calyx. (Coll. W. aud Sp.)

Eucalyptocrinus proboscidalis Miller 352

14. Internal cast ; the type specimen. (After Miller.)

Eucalyptocrinus decorus Phillips.

15. A specimen from Dudley, England. (Coll. W. and Sp.)

Figured for comparison with E. decorus Hall.

Crinoidea Camerata.

Plate LX7.XI1.

J.L Ridgway A.MWestergren. del.

Heiiotvpe Printing Go.,Ecsion.

LIBRARY

PLATE LXXXIII.

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Eucalyptocrinus inconspectus Iiingueberg 346

Fig. 1. The type specimen. (Coll. Dr. Iiingueberg.)

2. A specimen with arms. (Same collection.)

Eucalyptocrinus depressus S. A. Miller 349

3. The calyx and the partition walls enclosing the arms. (Coll. W. C. Egan.)

4a. A natural cast of another specimen ; lateral view. (Same collection.)

4 b. Basal aspect of another specimen. (Same collection.)

Eucaly'ptocrinus c.elatus Hall 330

5. A plump specimen from Rochester. (Coll. W. and Sp.)

6. A crushed specimen from Lockport, showing the ornamentation. (Coll. Dr.

Iiingueberg.)

7. A very young specimen referred to this species with some doubt (f). (Mus.

Comp. Zool.)

Eucalyptocrinus tuberculatus S. A. Miller ....... 337

8. One of the type specimens. (Mus. Comp. Zool.)

9. Another type specimen. (Same collection.)

10. Type of E. muralis Iiingueberg (from his collection).

Eucalyptocrinus ventricosus W. and Sp « . 341

11. Specimen with arms. (Mus. Comp. Zool.)

12. Dorsal aspect of the calyx. (Coll. W. and Sp.)

Eucalyptocrinus obconicus Hall 353

13. Natural cast of the dorsal cup. (Coll. Thomas A. Greene.)

Callicrinus Beachleri W. and Sp 355

14a. Lateral view of the calyx. (Coll. W. and Sp.)

14ft. Another view of the same specimen, showing the partition walls to their
full length.

Callicrinus cornutus Hall 357

15. Natural cast of the calyx. (Coll. Thomas A. Greene.)

16. Impression from a natural mould. (Same collection.)

17. Probably an undescribed variety of C. cornutus. (Same collection.)

Callicrinus acanthinus Iiingueberg 356

18. Inner aspect of the dorsal cup; the type specimen. (Coll. Dr. Iiingueberg.)

Crinoidea Camerata

Plate L XXXII!

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tj

A.M.Westergren del.

Heliotype Panting Go., Boston.