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MEMOIRS

MUSEUM OF COMPARATIVE ZOOLOGY

AT

HARVARD COLLEGE

EIGHTY-THREE PLATES TO ACCOMPANY.

VOLUMES XX. AND XXI.

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

University Press:
Jousx Wirson axp Sox, Campripar, U.S. A.

CONTENTS.

THE NORTH AMERICAN CRINOIDEA CAMERATA. By Cnartes Wacusmvutn and
FRANK SPRINGER.

PLATES I. TO LXXXIII.

TOGETHER WITH THE ACCOMPANYING EXPLANATION.

ata

ent

Memoirs of the Museum of Comparative <oologn
AT HARVARD COLLEGE.
Eregury-Turee PLATES TO ACCOMPANY.

Vos. XX, anp XXI.

THE NORTH AMERICAN

CRINOIDEA CAMERATA.

By CHARLES WACHSMUTH anp FRANK SPRINGER.

EIGHTY-THREE PLATES.

CAMBRIDGE, U.S. A.:
Printed for the Museum.
May, 1897.

PLATES AND EXPLANATION OF THE PLATES.

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6.

PLATE I.

A long stem with a finely preserved Root, probably belonging to Poteriocrinus.
From the Burlington Limestone

Stem with enormous Cirri, probably of Batocrinus grandis, with large eysts
on two of the cirri. From the Keokuk group at Crawfordsville. . . .

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

PAGE

44

43

43 —

large cirri, longitudinally arranged
Terminal end of a Stem, apparently of Barycrinus, attached by a flat surface.
From the Lower Burlington Limestone.
Profile view of the same.
Surface of attachment of same, showing open grooves passing out from the
axial canal of theistem <2 24.0 2% & iy Wes eeees en 46
Terminal end of Stem of Barycrinus, showing the large asteriform canal of
stem, and the linear canal of the cirri . ....4.4.. . 46
The quinquepartite Stem of a Barycrinus, somewhat weathered, showing the
longitudinal divisions, and two series of pores to each segment 46
Terminal end of Stem of Barycrinus, showing the large axial canal, with the
laminated structures 46
Su, b. Sections of stem fragments of Barycrinus, showing slits and pores through
t
the walls 46
9, 10. Dorso-central Plates, supposed to belong to a species of Heterocrinus.
From the Hudson River group at Cincinnati . . . .. +. =. =~. =. 49,51

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

PLATE II.

DETACHED STEM JOINTS OF VARIOUS FOSSIL CRINOIDS.

Fig. 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.

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

17 and 88 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 Whitet ; figs. 32, 36, and 39 to Cactocrinus ; fig. 40 to
Teleiocrinus ; to the five oval pieces shown by figs. 49 to 53 to Platycrinus.

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PLATE III.

Tue PLATES SURROUNDING AND CLOSING THE PERISTOME.
PAGE
Fig. la. Cyatuocrinus Gites1 W. and Sp. The interradial plates abutting upon the
radials preserved, but those covering the peristome removed. (Coll. W.
ANCES) MMIC oP L sme Lon meer Yes st ck Se Se © coe 9D, 114

1s. Another specimen of the same species, with the interradial plates partly
covered by small marginal pieces ; — otherwise in the same condition as
foelas (Samecollection.) . . . . +. . .» oar. aoe oe OD

2. CYATHOCRINUS BREVISACCULUS W. and Sp. (Ms.). Showing ants 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. CyatTHocrInus Noposus W. and Sp. (Ms.). Like fig. 2; but the orals still
more asymmetrical, and the interradial plates covered by marginal pieces.

(Sameycollection)\e=. ) 28s 2 5 2: as ss se wk ws 696, 11
4. CYATHOCRINUS MULTIBRACHIATUS Hall. Like fig. 3; but with the orals
resorbed. (Same collection.) ......-..... .. . 96,114

6. Eusprrocrinus sprrAuis Angel. Interradial plates exposed, very large, en-
closing large covering pieces which close the peristome. (Drawn with
anal side up. Zodl. Riks Mus., Stockholm.) . . .. ..... . «96
6. CyATHOcRINUS ALUTACEUS Angel. Arrangement of orals as in Platycrinus,
asymmetrical ; surrounded by small perisomie 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. Cyatnocrinus tm#vis Angel. The orals partly resorbed. (Drawn with
analsideup. 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. Hapnocrinus mespitirormis Goldf. The orals resting upon the radials.
12a. Posterior side of the oral pyramid.

12%. Ventral aspect of the same. (Coll. W.andSp.). ...... . . 92,93
13. Myrrintocrinus americanus Hall. Orals as in the preceding genus.
(Amer. Mus. Nat. Hist. New York.) ......+..+.2.2.=.~. 89

14. Coccocrinus rosAcrus F. Roemer. The orals symmetrical; separated from
the radials by a single interradial plate. (Coll. W.andSp.). . . . 89,90

Fig. 15.

16.

PAGE
Ip1ocrINUS VENTRICOsus W. and Sp. The orals represented by an un-
divided disk which is surrounded by five interradial plates not shown in
the figure. (Same collection.) .. . . . . « . « «5 « = 5 = = 9205
PLarycrinus symMMeETricus W. and Sp. The orals almost symmetrical.
(Same collection.) . . . - . + ++ e1+ + 2 + © « «+ « O45 60m
PLarycriNus Discoipeus O. and Sh. The orals more asymmetrical. (Same
collection:) 5. = & @ So. Hoel ue ie la le nC ROO SO moma
Erermocrinus coronatus (Hall). The orals distinctly asymmetrical. (Same
collection.) . 2-6 . = © 2 se 6 fe jon ck (ot) fet oot MCE St
TAaLarocrinus DEcORNIS W. and Sp, The posterior oral extremely large,
the other four unrepresented. (Same collection.) . ...... . . 88
DorycRINUS MISSISSIPPIENSIS Shum. The orals unusually asymmetrical.
(Same collection.) . . . . . . 3 | (2 <>). % 2 nem CESO)

. Eurrocnocrinus Curisty1 Shum. The orals excentric and asymmetrical.

(Same collection:) . . 3 3 3 5 6 5 se) ono,

. AcAricocrinus WortuEent F. Roemer. The orals separated from one an-

other by perisomic plates. (Same collection.) . ..... =.=. . 88,89
MARsupPIocrinus DEPREssuS Angel. The orals quite small and asym-
metrically arranged. (Samecollection.). . . . . . . © » 6 « 05,99

. Ruopocrinus Wurter Hall. The orals altogether unrepresented. (Same

collection.) 2. . 2. s 2 6 @ 5 se 6 © fo) i oitCn nen oS

. SyMBATHOCRINUS WaAcHsMuTHI M. and W. The orals asymmetrical, and

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

(Figures 1a, 4, 5, 6, 7, 8, and 16 enlarged ?; Figures 2, 3, and 15, ?.)

Fig. 1.

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PLATE IV.

PAGE

Ventral aspect of the internal cast of a specimen of Teleiocrinus, with sub-
tegminal ambulacra resting against the inner floor (7) . - - . . . . 102
‘The same aspect in a natural cast of Physetocrinus ventricosus . . . . - 102
The same in a cast of Physetocrinus ornatus . . . . . +... .. - «102
The same in a cast of Strotocrinus regalis . . . . . « « « « « « - « 102

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 . . - - - «© « © = & » = em
Cast of a Platyerinus, in which the ambulacra are subtegminal to the arm
bases, being placed at some distance from the inner floor of the disk . . 102
Cast of an Butrochocrinus Christyi, showing impressions of the lining covering

the inner floor of the disk . . © « = = © « «© =) ve 6) scuelsnaMSimmemmremel O22
Cactocrinus glans, showing fragments of the convoluted (digestive) organ, and
to the left the subtegminal ambulacra of one ray (7) . . . - . . . . 102

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

A specimen of Batocrinus, in which a new opening has been formed between
the basals toward the anterior side . . = © = il). iu mnCEEEEOG
A specimen of Batocrinus subequalis, with an abnormal opening directly
above the basals, involving the whole of the right Dera side of the
dorsal cup (slightly enlarged) . . . . . 2... « He so oo llsli

. Asmall specimen of Teleiocrinus umbrosus, with a Pe tube passing out

fromthetegmen. . . ... . Leute 1 3 eee ~is6

. A Steganocrinus pentagonus, with a sone anal sail given off near the ues

of the:regularione: =. 71 ns 5-0) iene ae ein + Tas) peo

A malformed specimen of Lutrochocrinus Christyi, with a second tube formed
above the arm bases .. . MPPEtermer shoe oo 6 5 La

A Batocrinus laura, with a aactua tube given off from the base of the origi-
nal one and a third tube apparently in process of formation. . . . . . 135

A specimen of Macrocrinus jucundus, in which a small tube branches from
the regular one =. 5. 6 5 5 ee lh fot oo

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

. Another tube of the same species bifurcating above the tips of the arms . . 1386

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

with small circular pits.

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

Yael

PLATE V.

THe ConvoLUTED ORGAN, AND THE STRUCTURE BENEATH THE TEGMEN.

PAGE

Fig. 1. A specimen of Zeleiocrinus, showing the convoluted organ, and portions of the
ambulacral skeleton, both heavily coated with silicious matter (7) . 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 2 6 ee ee a a oo
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 Agaricoerinus, 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 verneuilianus . 106
8. Lateral view of the organ in M. verneuilianus ; its upper end surrounded by
an annular vessel . . 2 ss + es su 00 no eee oul Dye
9. The convoluted organ in a specimen of Strotocrinus. . . . \ See eelts
10. Cactocrinus proboscidalis, showing a portion of the sanbilacen accieege and
the convoluted organ beneath . . . . = . . 5 ce) 9) SuseueenCneROM
11. Cactocrinus thetis, showing the delicate network of the convoluted organ . . 143
12. Dorsal aspect of the organ in Hutrochocrinus 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 longirostris, showing the lining within the
dorsal cup... 0. ets 0 6 6 6 se Se) ees nn
16. The inner floor of the tegmen of a specimen of Teleiocrinus rudis ; heavily
coated with silicious matter . . . . . . +; =. SSE eoelOG NOT
17. The inner floor of Batocrinus inornatus, formed into open galleries for the
reception of the ambulacra . . . . . . = = «= -)es0=uyEmmeEaUG

(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 CAMERATA

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PLATE VI.

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

PAGE
Mittericrinus Orgprenyi de Loriol . . . 2... . . . OGY
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, PI. 116, fig. 1.)
1b. 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 ; idid., fig. 1c.)
MILLERICRINUS POLYDACTYLUs de Loriol . . . . .. . . . 64
2a. The infrabasals attached to the truncated upper end of the stem (lateral
view).
2b. Ventral aspect of the same. (Both after de Loriol; #id., 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 ; 7id., Pl. 61, fig. 5d.)
MiLtericrinus Minteri d’Orbigny .......2.2..~. «642
4a. 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., Pl. 96, fig. 3.)
4b. Dorsal aspect of the cup, showing the small size of the axial canal. (ibid.,
Plate 96, fig. 2a.)
MILLERICRINUS CaRABorUFI de Loriol . . . 2. . . . . COG
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., Pl. 59, fig. 3c.)
MILLERICRINUS MUNSTERIANUS @’Orbigny . . . . .. .. .~ 62

6. Top stem joint, showing the angular ridges upon the upper surface. (After
de Loriol ; zid., Pl. 83, fig. 2.

PAGE
Ruizocrinus Rawson Pourtales . . .. . + «© « « « © © 668

Fig. 7a. 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. (dbid., fig. 14.)
PENTACRINUS ASTERIAS W. Thomson. ......... . £465
8. Dorsal aspect of the cup; the empty space within the basal ring interradially
disposed. (Carpenter, ibid., Pl. XIL., fig. 16.)
Meracrinus ancutatus P. H. Carpenter . ...... =. . 65
9. The space within the basal ring, contrary to preceding figure, radially dis-
posed. (After Carpenter ; did, fig. 2.)
BATHYCRINUS ALDRICHIANUS P. H. CARPENTER =... . . =. #£«65
10. Horizontal section of the basal ring. (After Carpenter; dbid., Pl. VII0.
fig. 2.)

11. The infrabasals of ONycHocriNus, coalesced with the top stem joint. (Coll.
W.and Sp.).... 05 6 6 6 te ee eto sues fonts sates

12. Dorsal aspect of the Base of Gryprocrinus DECADACTYLUS; the interradial
outline of the upper stem joint taking its form from the basal concavity.
(Same collection.) . . 2. 5 3 2 5 2 & 4 = 6) ene nE nt OD,

13, 14, and 15. Pentacrinoid larve of Anrepon. (After P. H. Carpenter; Chall.
Rep. on the Comatula, Pl. XIV.) =) 13> a) ee

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

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

Antrpon Rosacea Lamarck. .-. «6 . « © «0 eto eilcnennEeLO”,

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, Pl. XLI.)

19. In its adult state. (Idid., Pl. XXXVIIL)

OnycHocrinus Unricai S.A. Miller’. <9 5 ieee eee
20. In its general structure resembling a young Antedon.

(Figs. 20, 4a, Ta, 8, 9, 10, 11, 12, 18, are drawn with the interradial side up ;
Figs. 10, 3, 4, 6, 19, 20 with the radial side up.)

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lla.

PLATE VII.

ScAPHIOCRINUS ELEGANS W. and Sp.(MS.) ........

1a. 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.)
1). Posterior side of the specimen. (Kaskaskia group, Kentucky.)

ScyraLocriNus vALIpus W. and Sp. (MS.) .

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.

DeEcADOcRINUS GRANDIS W. and Sp.

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 - . 5 2: 6 95) ee

6. Posterior side of a specimen, showing the ventral sac to its full length.
(Locality and position same as last.)

ScyTALOcRINuUS (sp. undet.)). © - 5. = Soeur

ba |

Anterior view of ventral sac, showing the pores along the sides of the plates,
and the position of the anus. (Kaskaskia group, Kentucky.)

Scapniocrinus Swauttovi Meek and Worthen ..... .

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

Avtocrrnus AGAsstz1 W. and Sp. (MS. Nov. gen. and n. sp.) .
(aides a small tube, xpivoy a lily.)

9, Right postero-lateral aspect. Anus at the end of a special tube, given off
got p Pp P 8
half way down from the anterior side of the ventral sac. Sac and tube
profusely perforated by pores. (Keokuk group, Indiana.)

Ca@LiocRINus VENTRICOSUS (Hall) .
10a. Posterior side of the ventral sac.
10). Anterior side of it.
Cyarnocrinus Noposus W. and Sp. (MS.)

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

CYATHOCRINUS BREVISACCULUS W. and Sp. (MS.)

12a and J. 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.)

138

138

138

138

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157

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PLATE VIII.

PAGE
BARRANDEOCRINUS SCEPTRUM Angel . ........ 2... A484
Fig. 1. Showing arrangement of the plates in the calyx, and structure of arms and
pinuules. (Drawn by Mr. G. Liljevall from a specimen from Gotland in
the Zoél. Riks Mus. at Stockholm) (?).
CROTALOCRINUS PULCHER (Hisinger) . ......... . 164
2. A specimen from Gotland, showing the net formed arms. (Coll. W. and Sp.)
CROTATOCRINUSPM ASD ss os. laws w saw we « 6 a » 164
3. The tegmen of a specimen from Gotland; drawn by Mr. G. Liljevall (Zodl.
Riks Mus., Stockholm) (?).
CroTaLocrinus ruGosus (J. S. Miller). . . ...... =. 164
4, Tegmen of a fine specimen from Dudley, Eng. (}2). (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 Kon. andle Hon.. . . . . . . 87,88
(Plates showing the fosse along the edges.)
6a. Distal face of the axillary costal (1).
6). Proximal face of the same (1).
Gc. Lateral face of an interradial plate (2). (Same collection.)
SymBATHocRINUS SwauLovi Hall.. . . ....... =. . 136
7. A specimen with arms, from the Keokuk group of Canton, Ind. (Coll. W.
and Sp.)
SympatHocrinus WacusmutHt M.andW. ....... .~= 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 (?).
(Same collection.)
IPIsOCRINUS, (Sprundet.) << 2. « . . 2. . 1 ww ww we ee 186

10. Lateral view of a specimen with arms from Tennessee. (3) (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. 8S. A. Miller, in the 17th Report of

Fig. 11.

14.

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
Revision of the Paleocrinoidea, 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.)

ATLAGECRINUS CARPENTERI W.and Sp.. . .... .4+.5 .%

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

STEPHANOCRINUS ANGULATUS Hall: <~ . . . 5. © «| = Sen

A very elongate specimen. (Amer. Mus. Nat. Hist. New York.)
The disk in perfect preservation; the centre closed by five symmetrical
orals. (Same collection.)

CaTILLocRINus WacHsmMuTHI M. and W. .. .«.«+... « «

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

MARSUPIOCRINUS RADIATUS Angel. 5 < © <s ss = o) NelMeumrcmees

5. The tegmen, with small, regularly arranged covering pieces (7). (Drawn

from a specimen in the Zoél. Riks Mus., Stockholm, by Mr. G. Liljevall).

46—

103

Fig. 1a.

PLATE IX.

PAGE
RETEOCRINUS ONEALLI (Hall) . . . = © © «© “2% 0) teremoimluniS

Anterior view of a specimen with arms (7). (Coll. I. H. Harris.)
Posterior view of another specimen with arms. (Coll. W. and Sp.)

>, Lateral view, showing ventral disk. (Same collection.)
. A portion of the ventral disk enlarged. (Same collection.)

Inner floor of the calyx, showing the small supplementary plates which
surround the primary interbrachials (7). (Same collection.)
The type of “ Glyptocrinus cognatus.” (After Miller.)

RETEOCRINUS MAGNIFICUS S. A. Miller . . . =. . . see ol

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

RETEOCRINUS STELLARIS Billings ° 2 < << )ce een meemnECEEEDLUZIS

3a. One of the type specimens, posterior view. (Museum Geol. Sury., Canada.)
3b. Anterior view of another type specimen. (Same collection.)
3c. Part of the calyx, showing the fixed brachials. (Same collection.)

RETEOCRINUS FIMBRIATUS Billings. 5 = | <a.) een

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

XENOCRINUS Barri (Meck) © = 2 2) (Geese ee LSD

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

Lateral view of another specimen with arms. (Coll. W. and Sp.)
Inner floor of calyx (}). (Coll. I. H. Harris.)
Section of an arm, greatly enlarged.

XENOCRINUS PENICILLUS S. A. Miller=: <> 2) ence OS

. Lateral view of one of the types (7). (Same collection.)
. Posterior view of another type specimen (?). (Same collection.)

TANAOCRINUS TyPUS W. and Sp. ~ = 9.) 27 02) ) 2 -ueeeeenmerEeL SO

. Postérior view of a type specimen (?). (Coll. W. and Sp.)
. Anterior view of another type specimen (}). (Same collection.)

The stem, enlarged.

PLATE X.

PAGE
ARCHHOCRINUS LAcUNOsUS (Billings). ......... . . 200
Fig. 1. Posterior view of the type specimen. (Museum Geol. Surv., Canada.)
ARCHOCRINUS MICROBASALIS (Billings) . . .. .. « « « 256
2a. Specimen with arms and stem. (Coll. John Stewart.)
2b. Another specimen. (Same collection.)
2c. Basal aspect. (Same collection.)
ARCHAOCRINUS PYRIFORMIS (Billings). . . . .....-. . 255
3a. The type specimen. (Museum Geol. Sury., Canada.)
30. A crushed specimen, showing the arms. (Same collection.)
ARCHHOCRINUS DESIDERATUS W. R. Billings . . . ... . . 257
4a. The type specimen with arms; the left posterior radius in front. (Coll.
W. R. Billings.)
4b. Dorsal aspect of the calyx. (Coll. W. and Sp.)
7 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.)

Presi OD Oe

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has. R.Keyes del

PLATE XI

PAGE
DIABOLOCRINUS PERPLEXUS W. and Sp... .... .. »« « 200

Fig. 1a. Dorsal view of a large calyx, showing very small supplementary pieces
along the sides of the radials and between the interradials.
1). Ventral aspect of the same.

DIABOLOCRINUS VESPERALIS: White. . . <= 4 | \enneeEEEECD:

1c. Lateral view of a specimen in which no supplementary pieces are developed.

1d. 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.) ;

RHAPHANOCRINUS SUBNODOSUS (Walcott) . ..... =. . ~. 259

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

RHAPHANOCRINUS scuurrus (Miller) . © 2 5 2 Sj eee.) 260

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

Lyriocrmnus mztissa (Hall). 2-~ 5) 5) 75) seers

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

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

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

4/7.'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.)

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

LyRiockinus DAcTYLUS Hall. 2 20) see
5a and 6. The types. (Amer. Mus. Nat. Hist., New York.)
5c. Specimen showing the pinnules. (Mus. Comp. Zool.)

Ruopocrinus Wortuenrt Hall . . . . roe Oo 0 fo PY

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

«

Rropocrinus NANUS M. and Wa . 2 «0 lee 2oS

Ta, The type specimen, lateral view; from the Burlington Limestone.
7b. Ventral aspect of the same. (Mus. Comp. Zoél.)

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AM Westergren

s.R. Key:

LY

PLATE XII.

Raopocrinus Kirpyr W.and Sp... 2° % 2 ss acueeeenes

Fig. 1a. Specimen with spreading arms.
1). Another specimen with arms and column, anterior view.
1e. Posterior view of another specimen.
1d. The calyx, posterior view.

Raopocrinus NANUS M. and We . . =. 2 =| =) eee

2a. Anterior view of a specimen with stem.
2b. Posterior view of another specimen.
(Both from the Kinderhook group.)

Ruopocrinus Barrist, Hall

3. A small specimen with arms.

da. A very large, nodose specimen; dorsal aspect of the calyx.
4b. Side view of same specimen.

de. Posterior view of same.

4d. Ventral aspect of same.

5a. Lateral view of another specimen.

5b. Dorsal aspect of same.

Ruopocrinus BARRISI, var. STRIATUS W. and Sp... .. .

6. Latéral view of dorsal cup.

Ruopocrinus WortTHENI Hall

7a. Specimen with arms.
7. Dorsal aspect of calyx.

7c. Ventral aspect of same specimen.

Ruopocrinus WortTHENI, var. URCEOLATUS W. and Sp. .

8a. Posterior view of the calyx.
8+. Ventral aspect of same specimen.

RuopocriInus WATERSIANUS W. and Sp. .... . .

9. Specimen with arms and stem.

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

Pace

-- 226
- 228
230

5. Bl
. 220
eal
A Al

PLATE XIII.

PaGE
RaopocRinvus WauirEr Hall = . 2. 8 Se eee
Fig. 1a. Dorsal aspect of calyx. (Coll. W. and Sp.)
1). Ventral aspect of same specimen.
1c. Posterior side of same.
* Ruopocrinus rroncatus W.and Sp. . . . = = = eeEEeoH
2a. The type specimen, lateral view. (Coll. W. 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.
27. Side view of a very large specimen. (Same collection.)
RHODOCRINUS TUBERCULATUS W. and Sp... ..... . . 202
3. Side view of the type. (Coll. W. and Sp.)
4. Side view of a larger and more nodose specimen. (Same collection.)
SHODOCRINUS WacHsmutur Hall << 5 =) on ete ice,
5a. A large specimen with arms. (Coll. W. and Sp.)
5b. Posterior view of calyx. (Same collection.)
de. Side view of same specimen.
5d. Dorsal aspect of another specimen. (Same collection.)
RHODOCRINUS COXANUS Worthen’ 5522 2.) <0 -eeetenne
6. The'type specimen; lateral view. (Coll. L. A. Cox.)
7. Another specimen of this species, described as Rhodocrinus polydactylus.
(Same collection.)
RHODOCRINUS NODULOSUS Hall. ~ 20%) 6) 9) eee
8. The type specimen. (After Hall.)
Trysanocrinus Hari Lyon <7 <- 3) 5s LD
9a. Dorsal aspect of calyx. (Coll. Borden Institute, New Providence, Indiana.)
9b. An abnormal specimen. (Same collection.)
LaMPTEROCRINUS TENNESSEENSIS Roemer . . .- -- -. ~ 208
10a. Posterior view of the calyx. (Coll. W. and Sp.)
10d. Ventral aspect of same.
10. Anterior view of another specimen. (Same collection.)
10d. Portion of the stem.
THYLACOCRINUS CLARKEI W. and Sp. . . = = « = «eueemereedo
11a. The type specimen, lateral view. (State Cabinet Nat. Hist. N. Y.)
11). Infrabasal disk, showing the stellate column facet.

ES ————————

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PLATE XIV.

GILBERTSOCRINUS TYPUS Ces :

entire. From the Burlington and Keokuk eee
2. Another specimen from the same horizon ; side view. :
3. A specimen from the Upper Burlington Limestone with ‘tl

portions of the arms preserved.

(All specimens in the collection of ee

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PLATE XV.

GILBERTSOCRINUS TUBEROSUS (Lyon and Cass). . . .... .

Vig. 1a. A large specimen showing the calycine appendages.

1). Another specimen, showing the appendages and arms.

GILBERTSOCRINUS DISPANSUS W. and Sp... . .... .. .

2a. Ventral aspect of a specimen, with calycine appendages and arms preserved.
2h. Dorsal aspect of the same specimen.

2c. Lateral view of the calyx.

2d. Ventral aspect of the same specimen.

GILBERTSOCRINUS SPINIGERUS (Hall)... .. +... . =. «

3a. The type specimen, dorsal aspect of the calyx.
3). Lateral view of the same specimen.
3c. Ventral aspect of the same.

GILBERTSOCRINUS STELLARIS De Kon. and Le Hon .... .

4, Side view of a slightly enlarged specimen from Belgium. (In this species,
and the succeeding one from England, the appendages are arranged in five
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

5. Figured to illustrate the differences in the structure of the genus between
European and American forms. Mountain Limestone, England.

RHopocRINUS WHITETD Hall 2 7 5) 502i

Ga. Side view of a large and very perfect specimen.
6). Dorsal aspect of same specimen.

RuHopvocrinus WacusmutHr Hall < . . 2 > a eee

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.)

PAGE

239

240

247

236

236

223

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PLATE XVI.

GILBERTSOCRINUS TUBEROSUS (Lyon and Cass) .

. Specimen with stem.

Another specimen; ventral aspect.

Ventral aspect of another specimen with additional branches in the appen-
dages. The anal opening covered over by a Platyceras equilaterum.

Ventral aspect of another specimen.

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

A crushed specimen with appendages, arms, and pinnules.

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

PAGE

239

CRINOII

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Cha

PLATE XVII.

PAGE
GILBERTSOCRINUS RETICULATUS (Hall) . ........ . 244

Fig. 1u. Dorsal aspect of the calyx.
1b. ‘ Lateral view of another specimen.

GILBFRTSOCRINUS FISCELLUS (M.and W.) . ....- - .- « 246

2a. 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

da. Side view of calyx. ~-
4). Ventral aspect of same. (Figure drawn anal side up.)

GILBERTSOCRINUS TUBERCULOSUS (Hall)... .... « . . 243

5u. A specimen with arms, appendages, and stem.
5). Dorsal aspect of another specimen.
c, Ventral aspect of same.

Vt

GILBERTSOCRINUS TUBEROSUS (Lyon and Cass) ...... . 239
6. Dorsal aspect of calyx.

GILBERTSOCRINUS TYPUS (Hall). 2 2 2 io ee

7a. A large specimen from the Upper Burlington Limestone.
7b. Portion of the arms, showing mode of bifurcation.

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

Chas R Keyes del

PLATE XVIII.

PrycHocrinus PARVUS (Hall)

fig. lu. View of the specimen described by 8S. A. Miller as Glyptocrinus angularis

(3). (Coll. S. A. Miller.)
1). Another specimen with the arms better preserved (}). (Same collection.)
The specimen described by Wetherby as Glyptocrinus (Reteocrinus) gracilis

(2). (Coll. Mr. Vaupel.)

bo

PryCcHOCRINUS SPLENDENS (Miller). .-. ©. «© «© © «9s See
3x. The type specimen (#7). (Coll. S.A. Miller.)
3b. Another specimen (?). (Same collection.)

THYSANOCRINUS LILIIFORMIS Hall

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

THYSANOCRINUS OCCIDENTALIS ‘(Hall)). <= = jue entennonrents

5a. Side view of calyx (?). (After Hall.)
5b. Posterior view of calyx. (After Hall.)
5c. Dorsal aspect of calyx (7). (After Hall.)

THYSANOCRINUS INORNATUS (Hall). <= =. ips Cnn

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

6). Posterior view of same specimen.

Ge. Ventral aspect of same (7).

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

THYSANOCRINUS BRACHIATUS (Halli. <<) ec

bee |

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.)

IpIOCRINUS ELONGATUS W. and Sp, —<) 2) eee een
8a. The type specimen; side view. (Coll. W. and Sp.)
8). Ventral aspect of same (44).
8c. Another view of the ventral disk (7). (Anal side to the right. Coll. W.
and Sp.)

IDIOCRINUS VENTRICOSUS W. and! Sp: <u 9.) in iiacnlnn auemmtonEE

9a. The type specimen; side view. (Same collection.)
9). Dorsal aspect of the dorsal cup. (Anal side to the left. Same collection.)

«

IDIOCRINUS IMMATURUS) (Ela) seis. ceremonies
10a. The type specimen; anterior view. (Am. Mus. Nat. Hist. N. Y.)
10+. Posterior view of same.
10c. Dorsal aspect of same. (After Hall.)

IDIOCRINUS TENNESSEENSIS (Worthen) .....: ... -

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

PAGE

199

198

193

195

203

205

206

206

lo

fa

Chas R Keyes, AM Westergren del

3a.

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6a.

6b.
Ge.

PLATE XIX.

PAGE
SIPHoONOCRINUS NOBILIS (Hall)... «2 2 «1 = @) 16 sos eelteemnemmes ea

Gutta percha cast made from a natural mould. (After Hall.)

The quinquepartite infrabasal disk.

Internal cast, showing the arrangement of the ambulacra upon the left side.
(Coll. T. A. Green.)

Lateral view of a similar cast, showing their arrangement at the right side.
(Same collection.)

Ventral aspect of another cast. (Same collection.)

SIPHONOCRINUS ARMOSUS McChesney . . . 5 2 seu suaencmeCreeneeciel

Left side of an internal cast; the anal tube overlying the ambulacra, and
passing over to the anterior side of the calyx, being subtegminal to the
arm regions. (Same collection.)

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

Ventral aspect of another cast. (Same collection.)

SIPHONOCRINUS PENTAGONUS W. and Sp... .... .. . Zid

The type specimen; lateral view. (Same collection.)
Ventral aspect of another specimen. (Same collection.)

7 THYSANOCRINUS INORNATUS (Hall):-- . ee LOS

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

Hyeriocrinus typus W. and Spec). 2) caer)

Dorsal aspect of the specimen described by Miller as Cyphocrinus Gorbyi.
(After Miller, drawn with the anal side down.)

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

Ventral aspect of calyx. (Same collection.)

CRINOIDEA CAMERATA.

BR.Keyes, A.M.Weotergren del

PLATE XX.

PAGE
Guyprocrinus Dyger1 (Meek) ....... .. .. . « « dd
Fig. 1a. A large specimen with arms. (Coll. I. H. Harris.)
1). Posterior view of a large, flattened specimen of the type of Gl. Richardsoni
Wetherby, showing the fixed pinnules. (Coll. W. and Sp.)
ie. The base, showing the angles of the axial canal to be interradial. (Coll.
Mr. E. H. Vaupel.)
GLYPTOCRINUS MARGINATUS Billings .. ... . ¢ « «© = .2to
2. The type specimen; postero-lateral view. (Mus. Geol. Surv., Canada.)
° Giyprocrinus Fornsaetnr Miller... .- 5). mec eeeeueecO
3. The calyx and part of the stem. (Coll. I. H. Harris.)
GLYPTOCRINUS DECADACTYLUS Hall. 5. =) case e-em O
da. A very large specimen. (After Meek.)
4). Posterior view of calyx. (Coll. I. H. Harris.)
4c. Ventral aspect of a rather small specimen (?). (Coll. E. O. Ulrich.)
dd. Ventral aspect of an older specimen (#). (Coll. W. and Sp.)
de. Portions of the arms, showing covering-plates (+). (Same collection.)
' GLYPTOcRINUS RAMULOSUS: Billings” =. 29-1) 7. ae
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 Billamgs” <= 93) cues eee

6a. The type specimen; anterior view. (Mus. Geol. Surv., Canada.)
6). Posterior view of same specimen.

CRINOIDEA

PLATE XXI.

PAGE
Pericguyprocinus Bruinest W. and Sp... . . . . = 5 eee

Fig. 1a. Posterior view of a specimen with arms and stem. (Coll. John Stewart,
now in the Canada Survey Museum at Ottawa.)
1). Another specimen in the same collection, showing the left postero-lateral
ray and anal interradius.

PERIGLYPTOCRINUS PRiscus (Billings). . . . © = = sueuen eS

2. The type specimen. (Museum Geol. Sury., Canada.)

GuyptocRiInus DyERI (?)) . 9. 2 2 =) ese cr

3a-c. Young specimens, probably of G. Dyeri (2).

3d. Type of Miller’s Pyenocrinus Shaffert (¢). (Coll. 8. A. Miller.) . . . . 272
3e. Type of Miller’s Pycnocrinus Shafferi, var. germanus (7). (Same collection.)

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

GLYPTOCRINUS DECADACTYLUS Hall . > © 3 5 =e eee ec

4a. Inner floor of the dorsal cup (7). (Coll. E. O. Ulrich.)
4). Interior view of the basal cup (7). The angles of the axial canal directed
interradially. (Coll. W. and Sp.)

Guiyrrocrinus FornsHEenu? Miller; = 3 sq eee

Interior view of the basal cup (}4). The angles of the axial canal directed
radially. (Coll. I. H. Harris.)

or

Guyrrocrinus’ Dyerr Meek <2 2 2 Ween eC:
6. Calyx, showing the posterior side of a large, highly ornamented specimen.
(Coll. E. O. Ulrich.)
Compsocrinus Miamiensis 8. A. Miller. . ...... . - O18

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

G Compsocrinus Harpist S. A.*Miller 2-5. <0 | eeietcneennenn LT

8a. One of the type specimens; lateral view (74). (Coll. I. H. Harris.)
8). Posterior view of another type specimen (?). (Same collection.)

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Heliotype Prinung Co, Boston.

PLATE XXII.

PAGE
Mariacrinus WARRENI Ringueberg ......... . . 288
Fig. 1. The type specimen. (Coll. Dr. E. N. 8S. Ringueberg.)

Martacrinus Carteyi (Hall) ....... 2.2.2... . 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) . . . ......... 8085
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. Thearms. (After Hall and Whitfield.)

MeEtocrinus GrRacitis W. and Sp.. . ....... =... 298
5. The type specimen; side view. (Coll. J. M. Clarke.)

Metocrinus Canvini W. and Sp... ......2. +. =. . 800
6. The type specimen. (Coll. Prof. S. Calvin.)

MpnocrRinus: Tirranyr W.and Sp. . .. .. . .. + . . 299
Ta. The type specimen; right posterior view. (Coll. A. S. Tiffany.)
7b. The basals of same.

MeELocrinus paRvus W. and Sp. . . . . .. -. +--+ + + 808
8. The type specimen; anterior view (}4). (Coll. W. and Sp.)

MELocRiINUs opLoneus W. and Sp. . ........ =. =. 800
9. Lateral view of a very elongate calyx. (Coll. W. and Sp.)

Merocrinus opconicus Hall. ........ +... . . 3802

10a. Lateral view of calyx. (Same collection.)
10. Ventral aspect of another specimen. (Same collection.)
‘Je. The basals.

Fig. 11a.

Metocrinus Roemert W. and Sp... .- + + + 6 « «

Lateral view of calyx.

(Same collection.)

11). Ventral aspect of same specimen.

Mrtocrinus optonaus W. and Sp. .'. - . . « « « © «

12. The type specimen; lateral view. (Coll. W. and Sp.)

13. Lateral view of calyx (}4).

14a.
14.

de.

15a.
15d.

16a.

160.

MacrostyLocrinus FAscrAtus Hall

(Coll. W. and Sp.)

MACROSTYLOCRINUS sTRIATUS Hall. . ....+..-«e

Lateral view of calyx (44). (Same collection.)
Posterior view of another specimen (}4). (Same collection.)

The basals.

MacrostYLocrInus GRANULOsUs Hall

Lateral view of calyx (44). (Coll. W. and Sp.)
Anal view of same specimen.

MacrostyLocrinus Mrerxi (Lyon) .........

The type specimen; lateral view. (Coll. Borden Institute, New Provi-

dence, Ind.)
Dorsal aspect of calyx.

(Coll. Sidney 8. Lyon.)

301

300

288

287

289

. 290

PLATE XXIII.

PAGE
MELOocRINUS NOBILIssimus (Hall) . . . . . ...-~ s © =| 290
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.)
MELOcCRINUS PACHYDACTYLUS (Hall) . . 2. 2. 5 2 5 seus 296
4. The structure of the radial trunks and the origin of the arms. (After Hall.)
5. The type specimen of “ Muriacrinus” paucidactylus Hall. (After Hall.)
Marracrinus PLumMosus Hall . . 2-3 J. <2) seme mn earEeOEcOS.
6. The type specimen. (After Hall.)
7. Dorsal cup of a larger specimen. (After Hall.)
MacrostyLocrinus orNATUS Hall. . . . «. . « « s « « = 286
8a. The type specimen. (After Hall.)
8d. One of its radials, enlarged.
8c. A portion of an arm, enlarged.
MACcROSTYLOCRINUS FUSIBRACHIATUS Ringueberg. . . . .. . 291

9. The type specimen. (Coll. Dr. E. N. 8. Ringueberg.)
10. A smaller, somewhat distorted specimen. (Same collection.)

AM Westergrer

Chas.R. Keyes

PLATE XXIV.

PAGE
HIADROCRINUS Discus Lyon- « «56s «3 5 3 oo eueeEOZS
Fig. 1. The type specimen; dorsal aspect. (Coll. S. 8. Lyon.)
HADROCRINUS PLENIssIMUS Lyon .... .. . . « « «© 6 029
2a. The type specimen; dorsal aspect. (Coll. 8. 8. Lyon.)
2b. Inner floor of dorsal cup. (Same collection.)
TrcHNocrinus ANDREWsI Hall . . . . 3 - =) eee ECOG

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

MELOCRINUS PACHYDACTYLUS (Hall) < 2) <5 ) ca eecnniemeZ 90
4a. The type specimen. (After Hall.)
4b, Another specimen. (Am. Mus. Nat. Hist.)
MELOCRINUS BAINBRIDGENSIS Hall and Whitf. . . .. .. . 297
5. The specimen described by 8. H. Williams as Melocrinus Clarkei. (N. Y.
State Cabinet of Nat. Hist.)
(?) STELIDIOCRINUS ARGUTUS (Walcott) . - . ... 2. 3 . . 280

6. The type specimen. (After Walectt. Coll. Mus. Comp. Zodl.)

AtLOcRINUS TYPUS W. and Spx. ~ 92-9 eee eee OT)
Ta. Side view of one of the types. (Coll. W. and Sp.)
7b. Basal view of same specimen.

Au.tocrinus Benrpicrr 8. A. Miller = = = 2 = osmeenneeOUS

8a. Side view of calyx. (Same collection.)
8b. Basal view of same specimen.

RKeyes, del

Chas

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PLATE XXV.

DoLaTockiInus Excavatus W. and Sp. . =. = = o = | seelemeeeouM
Fig. 1. Dorsal aspect. (Coll. Victor W. Lyon.)
Dotatocrinus MARSHI, var. HAMILTONENSIS W. and Sp. . . . 814

2a. Dorsal aspect. (Coll. Victor W. Lyon.)
2b. Ventral aspect of the same specimen.

DoLATOCRINUS TUBERCULATUS W. and Sp........ ... S824

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

DoLATOCRINUS SPECIOsUS’ Hall’ . . . 2 . 9% =O

4a. Dorsal aspect. (Coll. W. and Sp.)
4b. Side view of the same specimen.

DoLATOCRINUS MAJOR W. and Spi. = = @ = Aelseinee eee Oo

or

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

Do.atocrinus: Lyronr Wand! Sp: =, 3-9. eS

6a. Dorsal aspect. (Same collection.)

6). 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.)
7b. Ventral aspect of same specimen.

STEREOCRINUS TRIANGULATUS Barris . . .-. . =. « «4 4 « O25
8a. The type specimen. (Museum Davenport Acad. Nat. Sci.)
8). Side view of same specimen.
STEREOcRINUS BarRist W. and Sp. : . | 215) -seeaenEenneEEOoO
9a. Side view of a fine specimen. (Same collection.)
94. Ventral aspect of another specimen. (Coll. W. and Sp.)
_ CENTROcRINUS PENTASPINUSs Lyon. . ... . . . ++ +. + 809

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

10). Side view of same specimen.

10c. Side view of another specimen in the Lyon collection. (Described as
Actinocrinus multicornus.)

Chas.R.Keyes del

Fig. 1a.

1d.
le.

ld.

2a.

20.

is)

=I

8.

PLATE XXVI.

PAGE
Dotatocrinus Marsar Lyon. «| . 2. « 2 3 « « «© 10 cn mOmmeley
The type specimen; posterior view. (Coll. 8. 8. Lyon.)
Dorsal aspect of same specimen.
Ventral aspect of same.
Inner floor of the inverted basal cup, showing its derivation from 3 plates.
DoLatocrinus Guyprus Hall.) . 3 . . 9 =e eenemSed,
The type specimen; posterior view. (Am. Mus. Nat. Hist. N. Y.)
Basal aspect of another specimen. (Coll. J. M. Clarke.)
DoLaTOCRINUS LiRATUS Hall). . . < = 2 % © Cee O
. A somewhat flattened specimen. (Am. Mus. Nat. Hist.)
DoLATOCRINUS ‘TRIADACTYLUS Barris. . = 9. ee teem OLO

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

Another specimen, giving a posterior view of the calyx. (Same collection.)
Another showing the dorsal view of calyx. (Coll. W. and Sp.)

. Ventral aspect of the same specimen.

DoLATOCRINUS IcOsIDACTYLUS W. and Sp... . . 5. « s « . ol9

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

. Posterior view of the same specimen.

. Ventral aspect of same.

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

Donatocrinus LAcus Lyon... = % ~ 1) ss nncne nen EOIEL

«. The type specimen; anterior view. (Coll. Sidney S. Lyon.)
. Dorsal aspect of the same specimen.
», Ventral aspect of same.

DoLaTocRInus ExcAvATUS W. and Sp. . ...... % « « oad

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

Inner floor of basal disk.

le

an —

Es

‘

NEN

Y

4b.

5a.

5b,

5e.

6a.

6).

Sb.
Se.

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

(All the specimens are in the collection of Wachsmuth and Springer, except
that of Fig. 1a, which is in the Lyon collection.)

PLATE XXVII.

BaTOcRINUS GRANDIS (Lyon). ..... »

Lyon’s type specimen, —a fine example with arms
Portion of an arm from near the top, enlarged.
Lateral view of the calyx.

Posterior view of a specimen with anal tube.

BATOCRINUS IcosIpAcTYLUS Casseday . .. .

Lateral view of a large specimen.
Dorsal aspect of another specimen.
Portion of the anal tube.

BATOCRINUS IRREGULARIS Casseday ... .

. Posterior view of the calyx, somewhat enlarged.

Lateral view of the same specimen.
Portion of the anal tube.

BaTocRINuS TURBINATUS (Hall). . 1... .

Posterior view of the calyx.
Lateral view of another specimen.
Antero-lateral view of a specimen with arms.

BATOCRINUS TURBINATUS, var. ELEGANS (Hall)

Latéral view of the calyx.
Posterior view of the same.

Barocrrnus cANTONENSIS Miller and Gurley .

Posterior view of a specimen, showing anal tube.
The same view of a specimen with arms.

BATOCRINUS CLyPEATUS (Hall) . ... .

1. Lateral view of the calyx.

The same of another specimen (variety B. papillatus).
Anterior view of a more wheel-shaped specimen.
Posterior view of a young specimen (typical form).

PaGE

381

368

369

375

383

Mt Wa ctanc
A.M Westergrer

PLATE XXVIII.

PAGE
Loxsocrinvs LoncrrRosTRis (Hall) . . . . . . i: 5 % <e eeette

Fig. 1a. Anterior view of a specimen with arms, anal tube, and column. (Mus.
Comp. Zool.)
1b. Portion of an arm with the pinnules, enlarged.
1c. Anterior view of the calyx. (Coll. W. and Sp.)
1d. Posterior view of the calyx. (Same collection.)
le. A very young specimen. (Same collection.)

BATOcRINUS LEPIDUS (Hall) = 2) 3 5 2 2,

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 ...... .. S72

4a. Side view of the calyx. (Same collection.)
4b. Specimen showing the anal interradius. (Same collection.)

Batocrinus @quanis (Hall) 12-9) Soi cence mers AL

5. Posterior view of the calyx. (Same collection.)
6. Specimen with arms. (Mus. Comp. Zool.)

‘ BATOCRINUS SUBZQUALIS (McChesney). . .... . .. «. 369

7a. Fine specimen with arms. (Same collection.)

7b. Portion of an arm with the pinnules, enlarged.

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

8b. Posterior view of the same specimen.

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

BATOCRINUS TUBERCULATUS: W. and: Sp). ===. - sinner ro

10a. Posterior view of the type specimen. (Coll. W. and Sp.)
104. Another specimen, showing the left postero-lateral ray. (Same collection.)

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.
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PLATE XXIX.

DizyGocrinus DODECADACTYLUs (Meek and Worthen) .

. Lateral view of the calyx.

Posterior view of the same.
Ventral aspect of same.

DizyGocrinus ANDREWSIANUS (McChesney)

. Posterior view of the calyx.

Lateral view of another specimen.
A specimen with arms, showing one of the postero-lateral rays.

. Posterior side of a specimen with arms.

DizyGocorinus RotuNnpbus (Yandell and Shum.)

. Dorsal aspect of the calyx.

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

». Ventral aspect of a specimen with distinctly convex plates.
. Lateral view of the calyx.

Another specimen, having part of the anal tube preserved.
Side view of a specimen with twenty arms.

. A larger specimen with twenty-two arms.

PAGE
» 432
. 4383
. 481

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

Batocrinus LAurA (Hall) .

. Large specimen with arms.

Anterior view of the calyx.

» Lateral view of another specimen.
. Posterior view of a more conical specimen.

Evurrocnocrinus Curisty1 (Shumard) ... .

6. A young specimen (7).

Su.
8).

9a.
9b.

Evutrocnocrinus Lover W. and Sp. ......
A young specimen (}).
Lopocrinus @QuIBRAcHIATUS (McChesney). . . .

Posterior side of the calyx.
Lateral view of another specimen.

. Lopocrtnus ©QUIBRACHIATUS var. ASTERTISCUS (M. and W.)

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

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

. 384

. 409

. 412

- 440

441

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PLATE XXX.

Batocrinus Macsriper W. and Sp.. .. .

Fig. 1. Specimen with arms, stem, and cirri,
2, Another specimen with arms and stem.
Ventral aspect of calyx (?).

y

BATOcRINUS MuNDULUS Hall . . «=. . « « « «

4a. Posterior view of the calyx.
4). Lateral view of the same.
5. Specimen with arms from Bono, Ind., probably of this species.

Batocrinus pocutum §. A. Miller .
6. Specimen with anal tube, arms, and stem.
Lozpocrinus YANpELLI (Shumard) ...... .

Ta. The type specimen, showing anal side.
7b. Dorsal aspect of the same specimen.

8

Logocrinus roBustus W.and Sp. .... .

8a. The type specimen; antero-lateral side.
8b. Posterior side of the same.

Logpocrinus Hacert (McChesney). ..... .

9, Posterior side of the calyx.
10, Antero-lateral side of another specimen.

Lospocrinus SPINIFERUS W. and Sp.

11. One of the type specimens, showing the anterior side.
12. Another type specimen, showing the posterior side.

Macrocrinvs gucunpus (8. A. Miller) . . .

13. Calyx and anal tube; anterior side.
14. Specimen with arms; antero-lateral side.

MACROCRINUS VERNEUILIANUS (Shumard) . ..- -

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.

PAGE

Me ce Oe
Hp 6 Oo OR
2 : 378
5 6 on o Geol
50 a oO EES
5 fo 6 gy CS!
so 6 Shh!)

0 o- b ah
sues 450

(All the specimens in the collection of Wachsmuth and Springer, except that

of Fig. 7, which is in the Lyon collection.)

PLATE XXXII.

PAGE
LOBOCRINUS NASHVILL@ (Troost) =. . . < 2 2 30 een oD
Fig. 1. Fine specimen with stem and anal tube.

LogpocRINUs NASHVILLE var. SUBTRACTUS (White) . ... . . 486
2a. Posterior side of a specimen with stem and anal tube.
2b. Portion of a deformed stem from another specimen.

Losocrinus PyRiForMIs (Shumard) ....... ... . A437
3a. Anterior view of the typical form; part of stem and anal tube preserved.
3b. Posterior side of a varietal form.
3c. Anterior view of an elongate variety.
3d. 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.

BATOCRINUS PISTILLUS M./and Wa... OTS
4a. Posterior view of the calyx.
4). Anterior view of another specimen.

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

CRINOI

Fig. La.
1).
le.

2a

2b.

PLATE XXXII.

PAGE
EvutrocHocrinus Curistyi (Shumard) ........ . . 409
Lateral view of a specimen, showing arms, stem, and anal tube.
A specimen preserving the extremity of the anal tube; viewed from above.
Posterior view of the calyx.
EvrrocHocrinus Lover (W. and Sp.) ....... . .. 412

Lateral view of the type specimen.
Anterior view of the calyx.

Evurrocuocrinus CaRIsTyI var. TRocHIScUS (M. and W.) . . . 410

3. Posterior view of the calyx.

4a.
4b.

EUTROCHOCRINUS PLANODIScUS (Hall). . . ..... =. . . Ail

Ventral aspect of the calyx.
Dorsal aspect of same; basals and first radials broken away.

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

GRINOIDE

~
>

» ae.

PLATE XXXII.

DizyGOcRINUS ORIGINARIUS W. and Sp. o. ee eo be eee
Fig. la. The type specimen.
1). 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.)
5e. Posterior view of another specimen.
DizyGOcRINUS- INDIANENSIS L. and ©. . ... . ss. « 415
Ga. Postero-lateral side of a specimen with arms.
6b. Calyx of another specimen, exposing anal side.
Diz1GOCRINUS 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.
8+. Another specimen, showing the arms and anal tube.

DIzvGOCRINUS BITURBINATUS, (Hall) 3 eee

a

9. Lateral view of the calyx.

Dizycocrinus Wuirer W. and ‘Sp. — =e) iss e ncn eee nO

10a, Specimen with arms from the Keokuk group of Bono, Ind.

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

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

Dizycocrinus 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.)

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Heliotype Prinung Co. Boston

PLATE XXXIV,

ERETMOCRINUS CALYCULOIDES (Hall)

Fig. la. Lateral view of a specimen having the lower part of the arms preserved.
1b. Opposite view of the specimen, showing anal tube.
2. A specimen showing the paddle-shaped tips of the arms.
8. 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.

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. .

6. Posterior side of the type specimen.
7. A specimen showing the anal side.
8. Lateral view of a very elongate specimen.

ERETMOCRINUS PREGRAVIS 8. A. Miller
9. Lateral view of the calyx.
10. Posterior view of another specimen.

GENNZOCRINUS KENTUCKIENSIS (Shum.) .

11. Dorsal aspect of the calyx.
12. Right postero-lateral side of another specimen.
13. Aspect of the ventral disk.

GreNNocRINus EucHARIS (Hall) . . .-. .

14. Portion of the dorsal eup

AcAcocrInus AMERICANUS W. and Sp... .
15a. Anterior side of the type specimen.
15d. Posterior side of the same specimen.

Acacocrinus Exropi W. and Sp.

16. The type specimen.

PAGE

395

390

405

548

549

Aorocrinus ELEGANS (S, A. Miller) .

Fig. 17a. Posterior side of the type specimen,
17). Ventral aspect of the same.

LoBocrINus INFLATUS (Bowley and Hare) .

18a. Anterior view of the type specimen. —
18). Lateral view of the specimen described by Rowley and Hare as 3 Batocr
bulbosus. ;

Dizycocrinus Gourueyi (S. A. Miller) .
19. The type specimen.

(All the specimens are in the collection of Wachsmuth anc
those represented by Figs. 18a and 18d, which are in the
R. R. Rowley, and Fig. 19, which is owned by Mr. F. A.

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Fig.

PLATE XXXV.

Macrocrinus Konincx1 (Shumard)

1. Specimen with anal tube, arms, and stem. (Mus. Comp. Zool.)
2. Calyx, showing anal side.
3. Another specimen, showing anterior side.

Macrocrinus LaAGuNncuuus (Hall) .

4. Calyx, postero-lateral side.

DizyGocRtnus INDIANENSIS (Lyon).

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

terior rays mostly single in the specimen.

Dizicocrinus pecorts (Miller)

6. Calyx, in a side view.

Dizycocrixus Evconus (Meek and Worthen) .

Ta. Calyx, showing the postero-lateral ray, and the anal interradius.
men from Taylor Co., Ky.)
7b. Dorsal aspect of the same specimen.

Dizyeocrinus MuTABILIs W. and Sp.

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 WHITEI var. pIpActyLus W. and Sp.

12. Specimen with the arms all paired.
13. Specimen in which most of the arms are single.

DiIzYGOCRINUS ORIGINARIUS var. ADULTUS W. and Sp.

14. Specimen with most of the arms paired.
15. Another in which most of the arms are single.

Dizycocrinus untonENsIS (Worthen) .

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.

(A speci-

Pacr

447

415

420)

430

429

420)

422

424

DIzYGOCRINUS UNIONENSIS var. pivAuis (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 paired.

24. Specimen with some of the arms paired.

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

PLATE XXXVI.

ERETMOCRINUS REMIBRACHIATUS var. EXPANSUS W. and Sp..

Fig. 1. Ventral aspect of a large specimen, showing the folding of the arms.
radial trunk of an Lucladocrinus millebrachiatus lying on top.
ERErMocEINUS CLIO’ ((Elalll)\- =) 2) ye 2 oe), ep ees

2a. Specimen with arms and column.
2b. Posterior side of the calyx.

ERETMOCRINUS NEGLECTUS (Meek and Worthen). . .. .

3. Anterior side of the calyx.

ERETMOCRINUS Chara (Hall) << = 5 <7) eacueremene

4a. Specimen with arms and column.
4b. Side view of a somewhat crushed specimen.

ERETMOCRINUS CoRBULIS (Eall). ~ 2) 5 eiev-tereineCiCnen

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 (Elalll)\ .. 3 = su cmcnenennems

7a. Specimen with part of arms (basals and radials not preserved).
7b. Posterior side of the calyx.
Tc. Dorsal aspect of the same.

Macrocrinus GEMMIFoRMIs (Hall). . . ...4... .

8. Posterior side of the calyx.

ERETMOCRINUS RUGOSUS ‘W. and Sp: 2) een tens
9a. Posterior side of the type specimen.
9b. Ventral aspect of the calyx. (Same specimen.)
9c. The base of the same specimen.

_Erermocrinus minor W. and Sp... ...... .
10a. Posterior side of the type specimen.
10). Antero-lateral side of another specimen.

ERETMOCRINUS -DEPREsSSuS W. and Sp. . .... « «.«

11a. Posterior side of the type specimen.
11%. Posterior side of a smaller specimen, with more convex plates.

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

PAacEe
390

The
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7. 449
- . 402
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Fig.

la.

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4b.
5a.
5d.
5c.

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Tb.
e

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8.

90.
9b.

PLATE XXXVII.

ERrErMoOcRINUS REMIBRACHIATUS var. EXPANSUS W. and Sp.. . . 390

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

ERETMOCRINUS REMIBRACHIATUS (Hall)... ...... =. . 3888

Lateral view of a specimen from the Upper Burlington Limestone.
Another example from the same bed.

ERETMOCKINUS MAGNIFICUS Lyon and Cass ...... . . 886

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

ERETMOCRINUS RAMULOSUS (Hall). 7) 52) lee OS

Posterior side of a large calyx from Tennessee.

Dorsal aspect of a highly ornamented specimen from Iowa.

Arm fragment, probably belonging to this species (from Tennessee).
Cross-section of it.

Upper portion of another arm fragment from the same locality.
The cross-section.

HRETMOCRINUS MATUOTA ((Hall)> ><) cnet on OOO)

‘Specimen with arms; the anal tube bent outward.
Specimen showing the natural curving of the anal tube.
A large calyx.

ERETMOCRINUS coRoNATUS (Hall) . .. . - 403

Dorsal aspect of the calyx.
Anterior side of same.
Ventral aspect of another specimen.

MACROCRINUS CARTCA, (Elalll); <2) 2) Gay ey tetantclnnte incite

Anterior side of the calyx.

ys EIRETMOCRINUS OLTO) (Elall): <<) ee -n e

Anterior side of the calyx.
Ventral aspect of a more lobate specimen.

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

Ape

Fig. 1a.

10.

2a.

Dh

De
ac.

2d.

Ze.

od.
3b.

. Postero-lateral side of same.

PLATE XXXVIII.

AGARICOCRINUS CONVEXUS (Hall)

Side view of the calyx, and portions of the arms.

Ventral aspect of the calyx.

AGARICOCRINUS BREVIS (Hall)

A fine specimen with arms.
Ventral aspect of the calyx.
Posterior side of the calyx.
Dorsal aspect of the calyx.
Side view of the calyx.

AGARICOCRINUS FISCELLUS (Hall)

Dorsal view of the calyx.
Ventral aspect of the same specimen.

AGARICOCRINUS PYRAMIDATUS (Hall)

4 Specimen with arms.

. Dorsal aspect of the calyx.

. Ventral aspect of the calyx.

5a. Posterior side of a young specimen.

5b. Dorsal view of same.

. Ventral aspect of same.

AGARICOCRINUS PLANOCONVEXUS (Hall) .

. Dorsal view of the calyx.
. Side view of another specimen.
» Ventral aspect of same.

AGARICOCRINUS STELLATUS Hall .

Ta. Dorsal view of a specimen with arms.

A small specimen with arms.
Dorsal aspect of the calyx.

. Another specimen, showing the anal side.
The same, showing the ventral aspect of the calyx.

PAGE

508

511

oo tal)
5. 6 yy
5. $3083
ee 00S)

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

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oon

PLATE XXXIX.

Acs«ricocrinus CorEyi (lL. and'@:) . . . . 2. © 3%

Basal view of the type specimen. (Lyon collection.)

. Side view of the same.

AGARICOCRINUS cRAssus Wetherby.

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

Dorsal aspect of the same specimen.

AGARICOCRINUS EXCAVATUS) Halll 9c) 2 0) ne
Side view of a specimen with greatly protruding anus. (Coll. W. and Sp.)
Dorsal aspect of another specimen. (Same collection.)
Dorsal aspect of another. (Same collection.)

AGARICOCRINUS NODULOSUsS, var. MacapAmsi Worthen

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

AGARICOCRINUS conicus W. and Sp. .

A fine specimen with Myzostoma (?) cysts on two arms.
Posterior view of the calyx. (Both specimens in the coll. W. and Sp.)

AGARICOCRINUS WORTHENI Hall . .. .

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

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

PAGE

510

499

491

498

501

490

AM Westergren del

ho

PLATE XL.

PAGE
AGARICOCRINUS SPLENDENS S.A. Miller. . . ..... . « 49d
Fig. 1a. A large specimen with arms and stem.

1). Dorsal aspect of another specimen.
1c. Ventral aspect of the calyx.

(?) AGARICOCcRINUS NoDULosuUs Worthen. . . ..... . . 49%
2. Dorsal aspect of a very smooth specimen with portions of the arms, from

Canton, Ind.

AGARICOCRINUS ELEGANS Wetherby ...... .-. .. «. 600
3a. Dorsal aspect of a specimen from Hamilton, II1.
3b. Ventral aspect of the same.

AGARICOCRINUS CRASSUS Wetherby . . - = = & ayeuee =) 499
4. Tegmen of asmall specimen from Tennessee; the food grooves of the pos-

terior rays covered by large alternate plates.

Acaricocrinus WorTHENT Hall. - 2 )-) 2) 90
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 Zodlogy.)

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PLATE XLI.

AGARICOCRINUS INFLATUS Hall
A large specimen with arms (the arms slightly restored.)
Posterior side of the calyx.
Dorsal aspect of another specimen.

The summit of the tegmen.

AGARICOCRINUS BULLATUS Hall. . .

Specimen with arms and stem.
Dorsal aspect of a large calyx.
Ventral aspect of same.

Inner floor of dorsal cup.

AGARICOCRINUS GRACILISs M.and W. ... .

A large specimen with arms.
Posterior side of calyx.
Dorsal aspect of same.

AGARICOCRINUS BELLATREMA Hall . ... .

a, Asspecimen with portions of the arms.

Posterior side of the calyx with one arm attached.
Posterior side of a smaller specimen.

. Side view of a large specimen.

AGARICOCRINUS BELLATREMA, var, MAJOR W. and Sp.

5. Ventral aspect of a very nodose specimen.

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

PAGE

502

493

513

506

507

SSS ‘

NAN

Ghas.R. Keyes

PLATE XLII.

PAGE
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).

AGARICOGRINUS WHITFIELDI Hall | = 5 5 3 5 eee OG
3. Ventral aspect of the calyx. (Illinois State collection.)

AGARICOCRINUS AMERICANUS, var. TUBEROSUS (Hall) . .. . . 489
4. Dorsal aspect of the calyx.

DorycriInus CORNIGERUS: (Hall) ~~) 955) ee LOS
5. Specimen with arms and stem.
6. Postero-lateral view of calyx.

Dorycrinus quinquELosus 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.
10d. Posterior view of the calyx.

Aorocrinus CAssepAyi (Lyon) <2 5 2) ee OS
11a. Ventral aspect of the type specimen. (Lyon collection.)
11). Posterior side of the same.
12. Side view of a specimen from Alpena, Mich.

Aorocrinus concavus (Meek and Worthen) . ..... . . 482

15a. Dorsal aspect of the type specimen. (Mus. Comp. Zoél.)
13+. Ventral aspect of the same.
13c. Side view of same.

ALLOPROSALLOCRINUS ConIcus Lyonand Cass. ..... . . 407

14a. Anterior view of the calyx.
14. Posterior view of the same.
14e. Dorsal aspect of same.

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

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ee

PLATE XLIII.

DoryYCRINUS MISSISSIPPIENSIS F. Roemer .
1. Specimen with arms and stem. (Coll. Lisbon A. Cox.)

Doryvcrinus Gounpr (Hall) 3%. <2) 35 eee
2. Large specimen with arms and stem. (Coll. W. and Sp.)
3. A young specimen with arms. (Same collection.)

AOROCERINUS SPINOSULUS (Hall). . 2 eee

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

DoRYCRINUS CORNIGERUS (Hall): . "27 as seinen

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

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

AGARICOCRINUS NODULOsUS Worthen .

7a. Dorsal aspect of the calyx. (Same collection.)
Th. Ventral aspect of the calyx.

AGARICOCRINUS WHITFIEDDI Hall) 2) eee eee

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

AGARICOCRINUS NoDosus Meek and Worthen

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

PAGE
455

456

478

458

463

496

493

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PLATE XLIV.

DorYcRINUS INTERMEDIUS Meek and Worthen .......

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

DoRYCRINUS MISSISSIPPIENSIS Roemer MCMC ec 0 0° Oo A=

2. Posterior side of the calyx.
3. Ventral aspect of a specimen with long spines.

Dorycrinus Goupr (Hall)

4, A specimen having the arms and portions of the spines preserved (from
Indian Creek, Ind.)
Anterior view of the calyx. (Specimen from Kentucky.)

or

DorycRINUS CORNIGERUS (Hall)

6. Dorsal aspect of the calyx.
Ventral aspect of another specimen.

AOROCRINUS SPINOSULUS’ (Hall) - e5 sane
8a. Posterior side of the calyx.
8b. Ventral aspect of the same specimen.
L
ERETMOCRINUS REMIBRACHIATUS, Var. EXPANSUS W. and Sp. .

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.)

455

456

458

478

390

vy del

UL Ridgwe

PLATE XLV.

PAGE
AoRocrRINus RADIATUS W. and Sp. ......2.2.2.2. =. 472

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

AOROCRINUS HELICE (Hall). . .......2.2.2.2.. =~. 483i

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

AOROCRINUS PARVIBASIS W. and Sp.. ........ =. . 473

3a. Specimen with arms from the anterior side.
3b. Posterior view of the ealyx.
AoRocRINUS IMMATURUS W.andSp...... ..... .. 471

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

4b, Posterior view of another specimen.
‘NOROGRINUS HELICE (7);, . 3 « » 5 - + | 3 « @ - . . 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.)
6. Posterior view of the same. (After Meek and Worthen.)

AOROCRINUS SUBACULEATUS (Hall)... ........ . 476

Ta. Anterior view of the calyx.
7b. Posterior side of the same. (After Hall.)

Dorycrinus unicornis (O.andSh.) . . ....... =... 468

8a. Anterior view of a specimen with arms.

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

8c. Ventral aspect of a large calyx.

8d. 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 PpARVUS (Shumard). . . ....... 2... 477

11a. Specimen with arms and stem.
110. Posterior side of calyx of a large specimen,

Dorycrinus UNISPINA (Hall) .

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

Ida.

13d.
13¢.
14.

15a.
150.

DoryckINuS MIssOURIENSIS (Shumard)

Anterior view of the calyx with spines intact.
Ventral aspect of the same specimen.
Posterior view of another specimen.

An abnormal specimen; posterior side.

Doryverinus Reamerrt M.and W.. . . =. + = 9. Seen

Anterior view of the calyx.
Posterior view of another specimen.

(All specimens, except 6 and 7é, in the collection of Wachsmuth and Springer.)

7

PLATE XLVI.

PAGE
(2?) Pertecnocrinus Wuirer (Hall) 530
Fig. 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.)

AGARrcocrInuS Sampsoni 8. A. Miller . 5 05
5. The type specimen. (Coll. F. A. Sampson.)

Losocrinus =Quipracuiatus McChesney 440
6a. Specimen with only eighteen arms. (Coll. W. and Sp.)
6b. Ventral aspect of the same specimen.

BatocrRInus ROTADENTATUS Rowley and Hare . 374
7. The type specimen, showing the dorsal cup. (Coll. R. R. Rowley.)

Barocrinus CAatvint Rowley 373
8a. Side view of the type specimen. (Coll. R. R. Rowley.)
8). Another view of the calyx, showing the anal interradius to the left.

DizyGocRINus EUCONUS, var. ABScIssuS (Rowley and Hare) . . . 431
9. Side view of the calyx. (Coll. W. and Sp.)

DizyGocRINUS MONTGOMERYENSIS Worthen . 428
10. Type of the synonym “ Batocrinus Gurleyi” R. and H. (Coll. R. R.

Rowley.)
Actrnocrinus (?) cHouTrauEnsis S. A. Miller 570

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

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SRINOIDEA

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7 aa. =

Westergren de)

6.

Sa.

8d.

PLATE XLVII.

Mrcistocrinus Evanst ©: andSh. « < :-. : 2. Knee

. Lateral view of a large specimen.

Ventral aspect of the same.

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

Inner floor of the anchylosed basals.
A medium-sized specimen with the anal opening low down.

1 Upper part of the stem.

Its lower part.

. A rather small specimen of the form described by Hall as Actinocrinus

brevicornis ; anterior side.

. Posterior view of the same specimen.

Ventral aspect of same.

MzGISTOCRINUS NOBILIS W and Sp. ...... .

Posterior side of a large specimen with arms.

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

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

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.)

~~“

PAGE

587

RATA

AD
WAV

OIDEA

CRINO

2

AM Westergren del.

Fig. 1a.
1d.
le.

9»

PLATE XLVIIL

MeEGIsTOCRINUS SPINOSULUS Lyon
Posterior view of the type specimen; from Louisville. (Lyon collection.)
Dorsal aspect of the same specimen.
Ventral aspect of same.

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

MeaisTocrinus LAtus Hall .

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

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

Mecistocrinus Farnswortui White .

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

Side view of another specimen. (Same collection.)

MEGISTOCRINUS concAvus W. and Sp.

. Dorsal view of the calyx. (Coll. W. and Sp.)
. Lateral view of the type specimen. (Davenport Acad. Sci.)
. Ventral aspect of the same specimen.

MEciIstocrinus RUGOsuUS Lyon and Cass.. . ...... .

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

Ventral aspect of the type specimen. (Lyon collection.)
Anterior view of a smaller specimen, showing portion of the anal tube.
(Same collection.)

PAGE

odd

538

539

543

’
.

RINOIDEA CAMERATA

te x

PLATE XLIX.

Mercistocrinus ABNorMIS Lyon .

Fig. 1a. Dorsal aspect of the calyx. (Coll. W. and Sp.)
1b. Lateral view of the same specimen.
1c. Ventral aspect of another specimen. (Same collection.)

Mecistocrinus DEPREssus Hall .
2. Aspecimen from New York. (Coll. A. §, Tiffany.)
8. Side view of a specimen from Louisville. (Coll. W. and Sp.)
4a. Dorsal aspect of a specimen from New York. (State Mus. Nat. Hist. N. Y.)
4). Ventral aspect of another specimen. (Same collection.)

4c. Portion of the arms. (Same collection.)
4d. Dorsal aspect of a small specimen from New York, showing the ornamenta-

tion. (Coll. W. and Sp.)
Mrarstocrrnus Noposus Barris .
Lateral view of the type specimen. (Mus. Davenport Acad. Nat. Sci.)
5b. Ventral aspect of another specimen. (Same collection.)
MecIsTOCRINUS MULTIDECORATUS Barris .

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

PAGE

546

540

OL
=
bo

6a.
6b.

Ta.

Tb.

PLATE L.

PERIECHOCRINUS NECIS (Winch. and Marey) ..... .

. Posterior side of an internal cast. (Coll. W. C. Egan.)
. Ventral aspect of another cast. (Same collection.)

PERIECHOCRINUS INFELIX W. and M.

An interior cast in a side view. (Same collection.)
Ventral aspect of an internal cast. (Same collection.)

Lateral view of a specimen figured by 8S. A. Miller as Saccocrinus Egani.

(Same collection.)

. Ventral aspect of another cast, figured as S. Lyani. (Same collection.)

PERIECHOCRINUS ORNATUS Hall and Whitf. .

. Gutta-percha cast from a mould in the rock, showing surface markings;

posterior side. (After Hall and Whitfield.)
Anterior view of an internal cast. (After Hall and Whitfield.)

PERIECHOCRINUS TENNESSEENSIS (Hall) . . ..... .

Posterior view of Remer’s type specimen, (After Roemer.)

PERIECHOCRINUS URNIFoRMIS (S. A. Miller) . . ....

. Posterior view of an internal cast. (Coll. W. C. Egan.)
5b. Ventral aspect of another cast. (Same collection.)

PERIECHOORINUS spEcTosuS (Hall) .
The type specimen. (After Hall.)
Part of an arm enlarged. (After Hall.)
PERIECHOCRINUS MARCOUANUS (Winch. and Marcy) .

Side view of an internal cast; anal side to the left. (Coll. W. C. Egan.)
Anterior view of the dorsal cup. (Same collection.)

«

528

526

523

YRINOL

PLATE LI.

Prertecnocrinus WuitFrecpi (Hall) .

Fig. 1. A very large and unique specimen with arms.
2a. Side view of the dorsal cup. (After Hall.)
. The plates of one ray, showing ornamentation. (After Hall.)

iw)
>

3. Posterior view of a large elongate specimen.
4. Ventral aspect of another specimen.
PERIECHOCRINUS MARCOUANUS (Winch. and Marey). .. .

Side view of the dorsal cup.
PERIECHOCRINUS TENUIDISCUS (Hall) .
6. Antero-lateral view of the dorsal cup. °
PERIECHOCRINUS ORNATUS (Hall) . ..... . 5
7. Side view of the calyx; from St. Paul, Ind.
Mrerstocrtnus Nobinis W. and Sp. .
8. A young specimen. (Type of Megistocrinus parvus.)

Pertecnocrrnus WuITEI (Hall)

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

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

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

PAGE

522

523

531

527

537

530

é so er) :
ee =.

Fig. 1a.
1b.

2a

=

8a.
8d.

PLATE LIT.

ACTINOCGRINUS LOBATUS Hall 5 2% "een

Ventral aspect of a large specimen.
Anterior view of the same.

ACTINOCRINUS VERRUCOSUS Hall. ......

A large specimen with anal tube, and portions of the arms.
Posterior view of the calyx.
Ventral aspect of the calyx.

ACTINOCRINUS MULTIRADIATUS Shum.. ... .

Large specimen with arms.

Posterior view of the calyx.

Ventral aspect of the same specimen.
Lateral view of another specimen.
Another specimen with arms.

AcTINocRiNus GrRiFFITHI W. and Sp. ... .

Anterior view of the calyx.

ACTINOCRINUS TUBERCULOSUS W. and Sp. .

Posterior side of the type specimen.
The structure at the upper part of the arms.
The proximal arm plates (enlarged.)

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

PAGE

557

558

555

573

CRINOIDEA

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AM Westergren del

PLATE LIII.

AcTINOCRINUS MULTIRAMOosUS W.and Sp. . . .

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

-

Actrnocrinus MaAGNiIFIcus W. and Sp. . .

2. A very large specimen with arms.

(Both in the collection of Wachsmuth and

PLATE LIV.

Acrinocrinus gucosus Hall . . + - - + + «© = = = ute 563

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

Actrnocrinus Lowki Hall. . . - - + + + e+ >

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

Acrixnocrinus Lopatus Hall .

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

Acrinocrinus tTRIgueis (S. A. Miller) . - - = + + = = = = 576

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

4b. Ventral aspect of the same specimen.

Cacrocrinus GLAns (Hall), < <= =) =) -s See 625

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

6a.* Lateral view of a less nodose specimen. (Same collection.)
6). Another view of the same specimen. é
7. Hall’s type of Actinocrinus eryx. (Mus. Comp. Zoél.)

AMPHORACRINUS VIMINALIS (HALL) . - - Pate eo Ve

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

4

Se.

mviWestergren del

Fig. 1a.

1b.

4a.

4d.

S

8a.

8).

10.
alate

12.

PLATE LV.

PAGE
ActiInocRINuS LoBATUS Hall... .. . 3 « | eS

Posterior view of a fine specimen; showing portions of anal tube and arms.
(Coll. W. and Sp.)
Stem near the calyx.
ACTINOCRINUS PERNODOSUS. Hall . . .- |. a gueeenmmE OGL
Anterior view of the calyx. (Same collection.)
Posterior view of another specimen. (Same collection.)
AcTINOCRINUS MULTIRAMOSUS W. and Sp...... .. . . 564

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

ACTINOCRINUS TENUISCULPTUS McChesney . - . ... =. . . O(1

Anterior side of a specimen with arms. (Same collection.)
Posterior side of the calyx. (Same collection.)

ActTINOCRINUS ScITULUS MI. ‘and! W.. = 1) aene een OOO)

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

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

' . . .
Posterior view of the same specimen.

or
a]
4

AcTINOcRINUS ARROSUS (S.A. Miller) <>) 53) cies
One of the type specimens. (Coll. F. A. Sampson.)
Dorsal aspect of the calyx. (Same collection.)
Side view of the same specimen.
Ventral aspect of same.

CACTOCRINUS OBESUS (Keyes) 27.) 3°.) 2) eeient> n-ne meee
Side.view of the type specimen. (Coll. Missouri Surv.)
Ventral aspect of the same. (Coll. W. and Sp.)

CacTocRINUS SEXARMATUS (Hlall)) { ~2) 7) eee OE EOL
Left postero-lateral side of the dorsal cup. (Coll. W. and Sp )
Posterior view of the calyx. (Same collection.)

Cactocrinus FossAtus (S. A. Miller). 29 9 -)) 0 we ennOZU

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

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PLATE LVI.

PAGE
ACTINOCEINUS DAPHNE-(Hall) . . - . . . . . = | =eemueempies
Fig. 1. Posterior view of a large specimen. (Coll. W. and Sp.)
Cactockinus THALTA (Hall) .~... - = . 5 (2 eeeOOe
2. Specimen with arms, described by Hall as Actinocrinus infrequens. (Mus.
Comp. Zoél.)
CACcTOCRINUS: THETIS (Hall) . 5 5 .. =) peueuerne ena 14:
3. Posterior view of the calyx and anal tube. (Coll. W. and Sp.)
4. A large specimen with arms. (Same collection.)
Cacrocrinus opuscutus (Hall). . . ..... .. 5 . . 607
5a. Specimen with arms. (Mus. Comp. Zodl.)
5b. Calyx, showing the left posterior ray and the anal interradius. (Coll.
W. and Sp.)
CacTOCRINUS MULTIBRACHIATUS (Hall) = . 2. = 3) 5 3 ee.) (617

6. Antero-lateral view of the calyx. (Coll. W. and Sp.)
7. Posterior view of another specimen. (Same collection.)

Cactockinus tucina (Hall) <. 92 =.) geen ee OUD:

8. Anterior view of a specimen with arms. (Mus. Comp. Zodl.)
9. Posterior side of the calyx; from near Louisiana, Mo., described by Rowley
and Hare as Actinocrinus puteatus. (Coll. R. R. Rowley.)

CactTocrinus Ectypus (Meek and Worthen). . ...... . 611
10. Side view of a large specimen. (Coll. W. and Sp.)
ACcCTINOCRINUS ‘GRACILIS W. and) Sp.) <3 sy. - sateen en nm (C2

11. A specimen with arms (4b. (Mus. Comp. Zoél.)

«

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CRINOIDEA

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awe

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PLATE LVII.

PAGE
CACTOCRINUS NODOBRACHIATUS W. and 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.. << 2 9.) - asp eecemeemOz:
3. Posterior view of the type specimen.
Cacrocrinus AmNompI W.and' Sp: .. % = i. 9.) cy cece mer
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. - <= = 5 =) element 006
5a, The type specimen, showing the right posterior ray.
5b. Portion of an arm from near the upper end (enlarged).
CACTOCRINUS EXTENSUS Wand Sp.) = jes enna mnCnme nn OLO

6. Lateral view of the calyx.
Specimen with arms, anal tube, and column.

CacTocRinus Loneus (Meek and Worthen). ....... . 609

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

Cactocrinus cLarus; (Hall). 2 2) emcee fant te rt O12
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) . . . >_< aye) screen memEnOU

«

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 in giving the appearance of spines to some arm-fragments lying upon the
disk.

CAMERATA.

CRINOIDEA

abe ts Et

thal

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PIVNir ss

\M.Weatergren del

PLATE LVIII.

PaGE
Cacrocrinus cnarus (Hall) . . . . . -°- . « © « @eeeuemmemes

Fig. 1. Showing the arm structure, and the arrangement of the hooks along the
pinnules.
CAcTocRINUS RETICULATUS (Hall) . . .,. - |; ls squeuReEemOOD

2a, Anterior view of the calyx.
2b. Posterior view of the calyx.

CactocRINUS PROBOSCIDALIS (Hall), > = = 2) =) fe eueeueemenenOOL
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.

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, ?.

7s. 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.

Te. Dorsal aspect of three adjoining pinnules greatly enlarged.
7d. A single pinnule joint, greatly enlarged.

CAcTOCRINUS MULTIBRACHIATUS (Hall) . «© : . ~ «5 5 = = 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).
10a. Specimen with arms.
10s. Arm joints, much enlarged.

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

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PLATE LIX.

PAGE
TELEIOCRINUS RUDIS (Hall) 2 <= -2\. 3. <u pe ne neeGOO

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. » - = « «| a ssseineneen OSD

4. Side view of the type specimen.

TELEIOCRINUS TENUIRADIATUS (Hall). | . 2 2 3 sess 6) 634 4%
5. Dorsal aspect of a specimen with arms.
6. Anterior side of a large calyx.
TELEIOCRINUS UMBROSsUS (Hall) << 9°) nee OZ S

7. Portion of the stem.

Cacrocrinus cmratus (Hall), <2) Qe OLS

8. Lateral view of the calyx ; typical form.
9. Posterior view of a slightly lobed specimen.

CacTOCRINUS CHLATUS, Var. SPINOTENTACULUS (Hall) ... . . 619

10. Anterior view of the calyx. ’

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

PLATE LX.

PAGE
STROTOCRINUS GLYPrus (Hall) . 2. 2 2 li) -p emu ee mOLO,
Fig. 1a. Specimen with arms and stem.

1b. Posterior view of a very large specimen.
1c. Ventral aspect of a natural cast.

TELEIOCRINUS UMBROSUS' (Hall) <> >. 2 -) 2) pee:
2a. 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). -2 °\ . -e cymes ewe OOS

3. A large specimen with anal tube and stem.

TELBIOCRINUS ALTHEA (Hall) . . . — (oy Ce cuncnnCUneEnCnEEennonEnEGS?
4. Anterior view of a large calyx.

ActTInocrInuS ASPERRIMUS M.and W. .......... 5S

\

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.)

BSR Keyes del

SOS

HTT

AT

Mt

Fig. 1a.

1b.

PLATE LXI.

PAGE
STEGANOCRINUS, scutpTus (Hall). . . .:. . . . «© . «4 Odo

Posterior view of a large specimen with arms, anal tube, and stem.
Lateral view of a very large calyx.

. Posterior view of another calyx.
1d.

Young specimen with arms and column.
Portion of one of the tubular appendages, showing the bases of the arms (2).
Cross-section of the same (7).

STEGANOCRINUS ARANEOLUS M.and W. , .... ... - « OSL
Dorsal aspect of a specimen with arms.

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

STEGANOCRINUS PENTAGONUS (Hall)) 3 ~ 2) 2 5-c) scanner OU

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

Anterior view of a large calyx.
Ventral aspect of the same specimen.

. Distal face of the first distichal (enlarged).
. Posterior view of a smaller specimen with more regularly arranged covering

pieces.

. Posterior view of a specimen from New Mexico.
. Ventral aspect of the same specimen.

STEGANOCRINUS CONCINNUS (Shumard). . .... ... . . 582

. Lateral view of the calyx.

Ventral aspect of a small specimen.

STEGANOCRINUS GLOBOsUS W. and Sp.. . . . « . ose. 00D

Lateral view of the type specimen.

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

«

ATA

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has.R.Keyes del.

iP CO bo Re

PLATE LXII.

AMPHORACRINUS SPINOBRACHIATUS (Hall) . ....

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

Side view of a specimen with arms.
Lateral view of the calyx.

. Dorsal aspect of the calyx, showing the ornamentation.

AMPHORACRINUS DIVERGENS (Hall). <<] = 9=) ee enoEs

Dorsal aspect of a somewhat distorted specimen with arms.

. Dorsal aspect of a fine specimen with spreading arms.

A forked oral spine of this specimen. ~
Posterior view of a fine specimen, showing the arms and spines surrounding ©
the anus. (The specimen was described by Meek and Worthen as A. dive
gens, var. multiramosus.) ;

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

. Side view of a very small specimen, showing the oral spines.
. Dorsal aspect of the same specimen.
. Ventral aspect of the same, showing the oral and anal spines.

Posterior view of the calyx.

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

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

PAGE

591

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PLATE LXIII.

PuyseETocRINus oRNATUS (Hall). .

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

Posterior view of the calyx. (Same collection.)

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

the anal opening. (Same collection.)

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

Puysetocrinus Corer (Miller) .

Side view of large specimen. (Same collection.)

PHYSETOCRINUS VENTRICOSUS (Hall)

Type of the variety internodius Hall. (Mus. Comp. Zodl.)

PuHyYSsETOCRINUS ASPER Meek and Worthen .

. Posterior view of the type specimen. (Mus. Comp. Zodl.)

Ventral aspect of the same.

PHYSETOCRINUS LoBATUS W.and Sp... . .

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

. Ventral aspect of the calyx: (Same collection.)

TELEIOCRINUS ALTHEA (Hall)

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

PAGE

597

598

593

596

599

632

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badd
TT

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AM Westergren del.

93

Beh

PLATE LXIV.

PHYSETOCRINUS VENTRICOSUS (Hall) . . = © ep e-neemmemns

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.

ot

6. Anterior view of the calyx.

7. Anterior view of a specimen of the type of McChesney’s “ Actinocrinus”
subventricosus. 2

8a. Specimen from the Lower Burlington limestone.
85. Ventral aspect of the same specimen. a

PHYSETOCRINUS DILATATUS M.and W. ........ © «

9. The type specimen. (After Meek and Worthen.)
10. Dorsal aspect of another specimen.

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

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Fig. 1a.
1d.
le. ,

1d.

PLATE LXV.

STROTOCRINUS REGALIs ((Elall)) 2) 09.) sno) eee

Lateral view of the calyx.

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

The extended rim of a large specimen, having portions of the dorsal eup
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.

Specimen showing the outer face of the tegmen.

SLROTOCRINUS GLYPTUS (Hall) (pce

. Dorsal aspect of a medium sized specimen.
. Tegmen of another specimen.

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

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Cal

1986
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Cr\ 13
Pres

PLATE LXVI.

PAGE
PLATYCRINUS HEMISPHERICUS M.and W. ......... . 03

Fig. 1a. Specimen showing arms and stem.
1b. Dorsal aspect of another specimen with arms spreading, and a Platyceras
infundibulum covering anal opening.
1e. Lateral view of the calyx; also a Platyceras infundibulum attached.
1d. Ventral aspect of another specimen.

PLATYCRINUS SUBSPINULOSUS Hall. . . < « « » «sl nenOO:

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

PLATYGRINUS VERRUCOSUS White .. = « «9 "cll em Nelle intcnmEmmnemmnn TIED

3a. Lateral view of the dorsal cup.
3b. Dorsal aspect of the same.

PLATYCRINUS EXCAVATUS Hall .. =< c: \elcl smetuecnntmERCnmrnmnTeLS!

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

PLATYCRINUS NODO-STRIATUS W.andSp.. ...... .-. . 698

5a. Dorsal aspect.
5). Side view of a somewhat depressed specimen.

PLarycrinus YANDELIT ©.and Sh. 2 7) 3) eaten OG:

6a. Dorsal aspect of a specimen with arms. —
6b. Posterior view of calyx.
Ge. Ventral aspect of the same specimen.

PEATYCRINUS SPINIFER W. and Sp. <=) jie mec enUS
7. The type specimen with arms.

PLATYCRINUS ORNIGRANULUS McChesney ....... .. OL
8. A specimen with arms.

PLATYCRINUS SUBSPINOSUS Hal]. ~~ 3) secu rccinne nC InNC In mM LOUE

9a. Dorsal aspect of a perfect specimen with arms. (Mus. Comp. Zodl.)
9b. Ventral aspect of the calyx.

<

PLATYCRINUS DIScOIDEUS QO. and Sh. . *s PPT ren ys ory ooh hoe 7

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

104, Ventral aspect of the calyx.

10c. Posterior side of the same specimen.

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

ATA,

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PLATE LXVII.

PLATYCRINUS SAFFORDI Hall)....°. « = = 5 «96 seen

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

Side view of the calyx. (Same collection.)

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

oo bo

Puarycrinus Giryptus M. and W. .
4. Specimen with arms and column. (Coll. W. and Sp.)
5. Dorsal cup of a large, elongate specimen. (Same collection.)
PLArycrinus 1ncomptus White .
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.. .... .

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

Puatycrinus cavus Hall .

8a and 6. Dorsal cup of two specimens. _ (Same collection.)

PLaTycrinus WORTHENT Efallli 2 2p erence

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

PLATYCRINUS GEOMETRICUS Wi./and Sp. | a-)l) ninannne mnie

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

PLATYCRINUS TRUNCATULUS ‘Hall: 25) i reenter

11a. Side view of the calyx, showing the bases of the arms (enlarged).
11d. Side view of another specimen.

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6b.

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PLATE LXVIII.

AGE
PLATYCRINUS VERRUCOSUS White . . . . . . «6 «+s. 5
The type specimen. (Mus. Comp. Zodl.)
Oblique view of the dorsal cup. (Coll. W. and Sp.)
Another specimen ; dorsal aspect of the calyx. (Same collection.)
Lateral aspect of a variety from New Mexico, showing the anal opening.
(Same collection. )
PLATYCRINUS POcILLIFORMIS Hall. . ...... 2... =. 106
Lateral aspect of the dorsal cup (the ornamentation from another specimen),
(Coll. W. and Sp.)
Base of a specimen with larger nodes. (Coll. W. and Sp.)
Puatycrinus YANDELLIO.andSh ......... =. =. 41706
Dorsal aspect of the calyx; a very mature specimen. (Same collection.)
Ventral aspect of the same specimen.
Posterior view of same.
PLATYCRINUS YANDELLI, var. PERASPER . . . . . +... . 708
Lateral view of a specimen with arms. (Mus. Comp. Zodl.)
Dorsal aspect of the same specimen (the stem removed).
PrATYcRINUS SCcuLPTUS Hall. ......... +... . 69

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

PLATYCRINUS PARVINODUS Hall. ....... .... ~~. 696

Side view of the type, the specimen somewhat flattened. (Mus. Comp.
Zo6l.)
Anterior view of another specimen less distorted. (Coll. W. and Sp.)

PLATYCRINUS PECULIARIS W. and Sp.. 700

Posterior view of the calyx; the nodes partly eroded by weathering. (Coll.
W. and Sp.)
Ventral aspect of the same specimen.

PLATYCRINUS GEOMETRICUS W. and Sp.

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

Fig. 9a. The type specimen. (Mus. Comp. Zool.)
9b. Basal view of another specimen. (Mus. Comp. Zoél.)

PaGE
IPEATYCRINUS ASPER Mirand We. «2 6 co kcm cei nance GOO)

PLATYCRINUS ORNIGRANULUS McCh. .. . . .. « « «+. 6) eumenGll

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

. Dorsal aspect of a very short calyx; showing the ornamentation. (Coll.

W. and Sp.)

. A costal and two pairs of distichals.

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

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

. A still smaller specimen (#). (Same collection.)

PLATYCRINUS EMINULUS Hall. 7 . = 2s eeec tmnt nme nmol.

. Anterior view of calyx. (Mus. Comp. Zodl.)

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

PLATYCRINUS SCOBINA (Mi ‘and We =) =. /cuuenreinicitCi IEEE OOF)

. The type specimen. (Mus. Comp. Zodl.)

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

PLatycrinus Gorspyi S.A. Miller) (55) ae 7G

Dorsal aspect of the calyx. (Mus. Comp. Zodl.)

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

PLATE LXIX.

- PAGE
PLATYCRINUS ‘SYMMETRICUS W.and Sp... . . . =: = « 3 eNGOD
Fig. la. Specimen with arms and column.
1}. Ventral aspect of the calyx; a large specimen.
le. Ventral aspect of a young specimen; the orals almost symmetrical.
\ Pratyerinus PLANUS ©./and Sh. . . .*. .) 7 SeeeGGS
2u. A large specimen with arms.
2). Lateral view of the dorsal cup.
2c. A portion of the arms enlarged.
2d. A young specimen, apparently of this species.
PLATYCRINUS BURLINGTONENSIS O.and Sh... ... .. . . 658

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

3). Lateral view of a large calyx.

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

dd. Posterior view of-a smaller specimen,

de. Ventral aspect of another small specimen.

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

5g. A very young specimen with zigzag arms, composed of single joints.

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

38¢. Portion of an arm in a dorsal aspect (enlarged).

PLATYCRINUS: AGAssizI, W. and Sp <) #.) -ane eee eG)

4. A very large specimen with arms.

PLATYCRINUS PILEIFoRMIS Hall’, 3792) EGG

5. A specimen with arms (slightly restored).

PLATYCRINUS BONG@NSIS White’ . = 5 c= saueuen een GG

6. A specimen having six arms to the ray.

Piatycrivus sarm Hall . ... = . . | =e Gg
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 Zodlogy, and Fig. 7, which is in the
Illinois State Museum.)

WD.

s

PLATE LXxX.

IPTATYCRINUS)S Awa “Ela cy. he ieel cin ete tee oe

Fig. 1. Specimen with faintly ornamented plates.

PLATYCRINUS NODO-STRIATUS W.and Sp.. = ~~. = -ccmmanere

3. Specimen with six to the ray, the most frequent number.
4a, Lateral view of the calyx; an older specimen.

4). Anal side of the same specimen.

4c. Ventral aspect of same.

PLATYCRINUS BREVINODUS Hall .

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

PLATYCRINUS TENUIBRACHIATUS Meek and Worth. ......

7. A specimen with arms.
8. Another specimen, slightly differing in ornamentation.

PLATYCRINUS SUBSPINULOSUS Hall

9. A highly ornamented calyx.

PrATYCRINUS SAMPSONI S: A.)Miller) = <9 5) ce uence

10. Lateral view of the calyx.

PLATYCRINUS PRATTENI Worthen .... . ;
11. A specimen with arms.
12. The basal disk.
PLATYCRINUS PILEIFORMIS Hall’ <> 3) ().) ec cnene
13a. Lateral view of the calyx.
13). Posterior side of the calyx.
PLATYCRINUS DAyist We. and Spr. cio mena

14. Lateral view of the type specimen.

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

688

687

684

73

671

684

~ it

LO

a

RMON HAAN oMbiy

rad

ANN

PLATE LXXI.

PAGE
PLATycRINUS INcompTUS White. ........... ... 664

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. Zodl.)

, Puatycrinus mquauis Hall . .......2.2.2.2. +. ~. 674

A very large specimen with arms. (Same collection.)
‘ortion of an arm (enlarged).
The calyx, showing the radial facets and the small first costal. (Coll. W.
and Sp.)
Puatycrinus topensis Halland Whitf, . . . ..... . 666

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

PLATYCRINUS GRAPHICUS Halland Whitf. . . . .... . . 672

7. The type specimen. (After Hall and Whitfield.)
PLATycRINus contritus Halland Whitf. . ..... . . . 667

type specimen. (After Hall and Whitfield.)

PLATYCRINUS NIoTENSIS Meek and Worthen . ...... . G82

ecimen with arms (from Indiana).

Puatycrinus Brittst 8. A. Miller. . . ...... =... «659

e type specimen. (Coll. F. A. Sampson, Sedalia).

PLATYCRINUS CORBULIFORMIS Rowley and Hare. . . ... . 657

1a. Dorsal cup in a side view.
Dorsal aspect of the same specimen. (Coll. R. R. Rowley.)

~

Puatycrinus mquitEerRNus S.A. Miller . . . ..... . +. 658

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

Puatycrinus pisumM Rowley and Hare ........ =... 660

The type specimen; posterior view. (Coll. R. R. Rowley.)
orsal aspect of same.

PLarycRrinus QuINQUENODUS White ono. 508 Saree
Fig. 14a. The type specimen; lateral view of calyx. (Mus. Comp. Zool.)
14+. Ventral aspect of same.
14c. Dorsal aspect of same.
PLatycrinus INsoLENS Rowley and Hare

15. The type specimen. (Coll. eke Rowley.)

PLATYCRINUS PECULIARIS W and Sp.

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

PLATYCRINUS ALLOPHYLUS S. A. Miller

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

PLATYCRINUS TRUNCATULUS Hall, ; . = <3) )3) ee

18a. Dorsal aspect of the calyx. (Coll. W. and Sp.)
18d. Side view of the dorsal cup.

PLATE LXXII.

PLATYCRINUS REGALIS Hall

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. and Sp.)

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

Evciapocrinus TUBEROSUS (Hall) .

oe

Specimen, showing the small branching arms given off from the tubular
appendages. (Coll. W. and Sp.)
4a. Posterior side of the calyx. (Same collection.)

4h. Dorsal aspect of the same specimen.

a

de. Ventral aspect of same.

EUCLADOCRINUS MONTANENSIS Meek . . ...=.. . 2... «6

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

Puatycrinus Hanyu Shumard

6a. Specimen with arms and stem. (Coll. W. and Sp.)
6), Portion of an arm, enlarged.

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

7b. Ventral aspect of the same specimen.

PLATYCRINUS BOONVILLENSIS S. A. Miller .

8a. The type specimen, showing the dorsal cup. (After Miller.)
8). Dorsal aspect of the base. (Coll. W. and Sp.)
9. Another specimen. (Coll. F. A. Sampson.)

PLATYCRINUS ORNIGRANULUS McCh. .

10. Basal disk, showing the ornamentation.

«

MARsUPIOCRINUS PRHEMATURUS (Hall and Whitf.) .

11a. Side view of the type specimen.
11. Dorsal aspect of the same. (After Hall and Whitfield.)

PAGE

710

728

662 —

681

TOL

734

"ag

Oy
DSTO

Fig. 1.

i)

ox

PLATE LX XIII.

EUcLADOCRINUS MILLEBRACHIATUS VW. and Sp.

A large specimen; the tubular appendages hanging over the calyx. -

EUCLADOCRINUS MILLEBRACHIATUS, var. IMMATURUS W. and Sp..

Dorsal view of a small specimen; the tubular appendages directed
horizontally.
Ventral aspect of a larger specimen, showing the bases of the arms.

EUcLADOCRINUS PLEUROVIMINEUS (White)

A large specimen, showing the dorsal side of the calyx.

Eucnapocrinus pr&NuNtIUS W. and Sp.

One of the type specimens, showing calyx and portions of the arms.

PLATYCRINUS HUNTSVILL& (Troost) W. and Sp.

A large specimen with inflated arms; the plates of the calyx not ornamented.

. Another mature specimen with ornamented calyx plates, the arms gradually

tapering.

7). A portion of one ray enlarged, showing the spinous processes at the sides of

phe arm plates, the waving suture lines between the lower brachials, and
the arrangement of the pinnules (?).

. An immature specimen; the arms uniserial to nearly one half of their

length (}).
A more mature specimen (}}).

. A very young specimen, the arms composed of comparatively elongate plates,

and uniserial almost to their tips (#).

. The base of a highly ornamented specimen.
. The base of a smooth specimen.

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

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Laer

: “Ptah Gale

1d

Fig. 1.

i)

PLATE LXXIV.

EvcbapoorINus PLEUROVIMINEUS (White)

A magnificent specimen, showing the calyx, the tubular appendages,
and column.

EvcLabDOcRINUS MILLEBRACHIATUS W., and Sp. .

A moderately large specimen, showing the dorsal side of the calyx,
appendages, and arms.
Side view of the calyx. ;
Ventral aspect of a fine specimen, showing the rigid covering pie
tubular appendages, and the ventral furrows along the arms.
Lateral view of one of the tubular appendages, showing the ara
and the respiratory pores at the base of the arms. :
Cross section of an appendage, showing the central cavity. aed,
The appendage with the covering pieces removed. ;
Distal face of a stem joint from near the calyx, showing the transver
‘and the minute axial canal.

Portion of an arm enlarged, showing the pinnules. : 4
(All ae specimens in the collection of Wachsmuth and Springer.) }
"Ue

> 18

.

PRINOIDEA CAMERATA. . =

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reemueest
a

ng Co, Boston.

Pnnu

ehotype

See ~
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= =. ee

PLATE LXXV.

PaGe
. CAMPTOCRINUS MYELODACTYLUS W.andSp. ...... . =. 779

A specimen with stem and cirri. (Coll. W. and Sp.)

and 6. Portions of the coiled stem in different specimens, showing the cirri.

= Dicnocrinus Buatri 8. A. Miller . . . ...... +. +. +. «778

ice ‘The type specimen. (After Miller.)

-

=]
=]
ew)

y DicHocrinus HUNTSVILLa W. and Sp. |

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

Dicuocrinus cinctus 8. A.Mintrr .......... +. T64

imen with arms. (Same collection.)

Dicnocrinvs conus Meek and Worthen . . . . . . . . . . 770

e type specimen. (Illinois State collection.)

PLATYCRINUS CANALICULATUS Hall. . . ...... 2. =. =. 689

Specimen with arms. (Coll. W. and Sp.)
we vil Dorsal geuert of the calyx. (Same collection.)

PuAtycrinus scuuptus Hall. ........2.2.2.+.~. 691

Bp specimen with arms. (Same collection.)

oe pe ler specimen. (Mus. Comp. Zodl.)

- PLatycrinus AMERICANUS Ovand’Shse 530s < ©. « «-. so 686

nature specimen with arms; the latter biserial from above the last bifur-
yn. (Coll. W. and Sp.)

mg specimen; the arms uniserial and zigzag, the joints elongate, and
Bs pinnules far apart. (Same collection.)

al aspect of the calyx. (Same collection.)
view of the calyx of a large specimen. (Same collection.)

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CoccOGRINUS BACCA EF. Roemer. 2 3 Go. ms et es TCS

Fig. 15a. Dorsal aspect of the calyx (drawn with the anal interradius at the lower
left side). z

15). Right anterior side of the same specimen.
15c. Posterior side of same. (Same collection.)

MARSUPIOCRINUS TENNESSEENSIS (F. Roemer)... ... . . 731

16a. Dorsal view of the calyx. (Coll. W. and Sp.)
16). Ventral aspect of the same specimen.

MARSUPLOCRINUS STRIATUS W.jaid'Sp; < = . « <2: senne a 732

17. Dorsal view of a rather small specimen. (Same collection.)
18. Ventral aspect of another specimen.

MAaRsuPIOCRINUS TENTACULATUS (Hall) . . .....-.. . {odd
19a. The type specimen. (After Hall.)
19). Enlargement of one of its rays. (After Hall.)

CorpyLocrinus PLUMosUS (Hall) . . . <= 2) eT

20. The type specimen. (After Hall.)

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Heliowype Printing Co, Boston,

Fig. 1a.
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PLATE LXXVI.

PAGE
ARTHRACANTHA ITHACENSIS Williams. . . ....... =. TAY
Lateral view of a specimen with arms. (Museum Cornell University.)
Basal disk.
The movable spines upon the tegmen.

ARTHRACANTHA PUNCTOBRACHIATA Williams 750
2a. Specimen showing spine bases. (Coll. W. and Sp.)
26. Another specimen with some spines attached. (Coll. Prof. 8. Calvin.)

ARTHRACANTHA DEPRESSA W.and Sp... . ........ Tal
8a. Dorsal aspect of the type specimen. (Coll. W. and Sp.)
3b. Ventral aspect of the same specimen.

DicHocrinus LInEATUS Meek and Worthen. . . . . ... . T61
4a. The type specimen; posterior view of the calyx. (Mus. Comp. Zodl.)
4b. Anterior view of the same specimen.
4c. Dorsal aspect of same.

Dicuocrinus pisum Meek and Worthen. . . . .... . . 763
5. Specimen with arms. (Mus. Comp. Zodl.)

Dicuocrinus crassitestus White. .......... . 769
6a. The type specimen; the anterior side exposed. (Same collection.)
6). Another specimen with part of the column attached. (Coll. W. and Sp.)
6c. Posterior view of the calyx and anal tube. (Same collection.)

Dicuocrinus ovatus OwenandShumard . ....... . 760
7. A fine specimen with arms. (Mus. Comp. Zodl.)

IDICHOCRINUS LIRATUS’ Hall . . . . 2 ss 2 es ee se es 6189
8. Specimen with arms and part of column. (Same collection.)

Dicnocrinus coxanus Worthen. . .....- + +. + + + + 763
9. The type specimen. (Coll. L. A. Cox.)

DiIcHOCRINUS HAMILTONENSIS Worthen . . - . ++ + + + + ‘ie
10. The type specimen. (Same collection.)

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DicHocrinus ANGusTtus White .... .

Fig. 11. Posterior view of a specimen with arms. (Coll. W. and Sp.)
DicHocrinus supErstEes W. and Sp.

12. Side view of the type specimen. (Same collection.)

CAMPTOCRINUS CIRRIFER W. and Sp. .

13a. The type specimen, showing the curved cirrus-bearing stem; from the |
Kaskaskia group of Kentucky. (Coll. W. and Sp.)

13s. Another specimen from the Kaskaskia group. (Same collection.)

13c. A specimen from the St. Louis group of Huntsville, Ala. (Same collection.)

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type Printing Oo, Boston,

PLATE LXXVII.

PAGE
DichocRInus PpotypActyLus Cass.and Lyon . . .. .. . . 7d6

1a. A large specimen with aris.
1b. Posterior view of calyx, showing the elevated dome and disk ambulacra.

DicHocrinus LacHRYMosus Hall . . ....... +. . . Td4
2a. Specimen with arms and stem.
2b. Posterior view of calyx.
2c. Ventral aspect of same.

Dronocrmussrmrarus Hall . . . . . 2 © «+ 6 + « ew « 109
3a. Specimen showing the arms and stem.
3b. Posterior view of the dorsal cup.

DicHocrinus cinctus Millerand Gurley. . . ...... . 764

4a. Posterior view of specimen with arms,
4b. Ventral aspect of the calyx.
4c. Distal face of first distichal (¢).

Dicuocrinus puicatus Hall. ............ . 458

5a. A small specimen with arms and stem.
5b. Another specimen, giving a side view of the dorsal cup.

DicHocRInus ornatTUS W.andSp.. . ........ . . 162

6. Specimen with arms and stem, from near Mt. Pleasant, Iowa.

IDIGHOCRINUS L@vIs Hall . . .... . ss ew et ew et 465

Ta. Specimen with arms. (Coll. Mr. Fultz of Burlington.)
7b. Another specimen. (Same collection.)
7c. Portion of an arm with pinnules (enlarged).

IDICHOCRINUS OVATUS ©. and'Sh.. . . . . .« 0 « « »« »« « « %60
8a. A specimen with arms.
8d. Posterior view of the dorsal cup.

DicHocRInus opLoncus W.andSp. ..........~. Td9d

9. Posterior view of the type specimen.

Dicuocrinus Pisum M. and W. .

Fig. 10. Posterior side of the dorsal cup. (After Meek and Worthen.)

Dicwocrinus strrarus O.andSh........ -
11a. Posterior side of the dorsal cup.
11). Side view of another specimen. ~

Dicuocrinus InoRNATUS W. and Sp.
12a. Posterior view of a specimen with arms.

12b. Another specimen.

DicHocrinus DELIcATUS W.and Sp. ...... .;

13. The type specimen.
(All the specimens, except 7a, b and 10, are in the collection of Wachsmuth

and Springer.)
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Heliotype Printing Gs, Boston

PLATE LXXVIII.

PAGE
TALAROCRINUS SEXLOBATUS (Shumard) . ...... ... 784

Fig. 1a. Posterior view of a specimen from Flagpont, Va. (4°). (Coll. W. and Sp.)
1b. Ventral aspect of the same specimen (';’).
1e. Dorsal view of the calyx. (Coll. W. and Sp.)
TALAROCRINUS ovATUS Worthen. . .......... . 187
2a. Posterior view of the type specimen (1°). (Illinois St. Coll.)
2b. Ventral aspect of the same specimen (}’).
TALAROCRINUS DECORNIS W.andSp........... . 788

3a. Posterior view of the type specimen (4°). (Coll. W. and Sp.)
3b. Ventral aspect of the same (1).
8c. Specimen with arms ('?). (Same collection.)

TALAROCRINUS SYMMETRICUS (Cass.and Lyon). . . . .. . . 786

4a. Posterior view of the calyx (4°). (Coll. W. and Sp.)
46. Ventral aspect of the same specimen (\’).
5. Posterior view of type (}°). (Coll. 8. 8. Lyon.)

TALAROCRINUS CorNIGERUS (Shumard) . ....... =... 783

6a. Posterior view of a specimen from Pulaski Co., Ky. (Coll. W. and Sp.)

6d. Ventral aspect of the same specimen (1°).

7a. Anterior view of the type specimen, from Alabama (4°). (Mus. Washington
University, St. Louis.)

7b. Ventral aspect of the same (1°).

TALAROCRINUS SIMPLEX (Shumard) ..... .-.- +--+ + 790

8a. Anterior view of the dorsal cup (4%). (Coll. W. and Sp.)
8. Dorsal aspect of a larger specimen. (Same collection.)

TALAROCRINUS sp. (?)

9a. Posterior view of a specimen from Pulaski Co., Ky. (7%). Perhaps an ab-
normal specimen of 7. sexlobatus. (Coll. W. and Sp.)
9b. Oral plates of the same (})).

HEXACRINUS OCCIDENTALIS W.andSp. ...... .- . +. 740

10. Anterior view of the type specimen. (Mus. Davenport Acad. Nat. Sci.)

Fig. 11a. Lateral view of the type specimen; somewhat crushed. (Coll. 8. S. Lyon.)

’ PAGE
DicHocRINUS PENTALOBUs (Cass. and Lyon). . ...... . T79

11d. The fixed brachials, enlarged ().
1ic. An imperfect specimen, showing parts of the pendant arms. (Coll. S.S.
Lyon.)

Hexacrinus Lear (lyon). . - . 2. 5 6 6 sow op cuenenOm

12a. Anterior view of type; the lower brachials and a few joints of the stem
restored from another specimen. (Coll. 8. 8. Lyon.)

124. Basal cup of same specimen.

DicHOCRINUS scItULUS Hall ...° . 3 2 « = 2 =e a eemnTIGUE

13a. Side view of a large specimen with arms, from the Lower Burlington lime- -
>» Stone. (Coll. W. and Sp.)

13d. 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.)
DicHockInus PENDENS W.and Sp... . <9. = 24 gees
15. Specimen with pendent arms from the Upper Burlington limestone. (Coll.
W. and Sp.).
DicHocrinus Frcus.Cass. and Lyon”. . > 95

16a. Posterior view of the calyx. (Coll. W. and Sp.)
16). Side view of another specimen. (Same collection.)

Heliotype Printing Ce, Boston

PLATE LXXIX,

PAGE
TALAROCRINUS SUBGLOBOSUS W.and Sp... ....... 789
Fig. la. Posterior view of the calyx. (Coll. W. and Sp.)
16. Ventral aspect of the same specimen.
PTEROTOCRINUS DEPRESSUS Lyonand Cass.. . . . . . . . . 796
2a. Lateral view of the type specimen. (Coll. 8S. S. Lyon.)
2b. Lateral view of the calyx, showing two of the wings. (Coll. W. and Sp.)
2e. 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. . ......... . 799
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.)
3e. Dorsal aspect of a fine specimen with arms and wings. (Same collection.)
3fand g. 2 wings of a different species. (Same collection.)
PrEROTOCRINUS PYRAMIDALIS Lyon and Cass... . . . . . . 798
da. The type specimen; lateral view of the calyx. (Coll. S. S. Lyon.)
4). Dorsal aspect of the same specimen.
PYEROTOCRINUS CHESTERENSIS Meek and Worthen . .... . S02
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.)
IQEROTOCRINUS CAPITALIS Lyon. . ....... 2. « « « 9d
6a. Postero-lateral view of the type specimen. (Coll. S. S. Lyon.)
6b. Ventral aspect of the same.
PTEROTOCRINUS CORONARIUS Lyon ........ .... 195
Ta. Ventral aspect of the type specimen. (Same collection.)
7b. Side view of the same; the dorsal cup not preserved.

Prerorocrinus crassus Meek and Worthen
Tig. 8. Posterior view of the type specimen. (After Meek and Worthen.)
PreROTOCRINUS ACUTUS, var. BIFURCATUS Wetherby .

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.

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PLATE LXNXX.

PAGE
Acroertnus SHumarpr Yandell. 2. 6... 0.0. 0. 6 ee... 806
Vig. J. 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 Woand Sp... 2. 2 0. 2 ee ew ee 808

4. A large specimen with portions of the arms and stem.
©» A smaller specimen, enlarged (7).
6. ‘The calyx somewhat flattened and enlarged (7).

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 (?).

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 WortHent Wachsmuth . . . . 2. . 2)... 807

102. Diagram made from the type specimen in the Illinois State Museum.
10, Showing the outlines of the specimen.

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AM Weatergren del

PLATE LXXXI.

EUcALYPTOCRINUS CRASSUS Hall. . ... . =: .,

Fig. 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.)

6. 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.

Eucatyprocrinus Enropi 8. A. Miller

7a. A perfect specimen with arms, from Waldron, Ind. (Mus. Comp. Zoél.)

7b. 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 §p.)

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.)

UL Ridgway del

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14.

PLATE LXXXII.

PAGE
EUCALYPTOCGRINUS OVALIS Hall > . . 2 2 = «0s pl ccenemEee

. Stem and root. (Coll. W. and Sp.)

. Specimen with arms and part of stem. (Same collection.)

. Another specimen showing the partition walls. (Same collection.)
. A-specimen with arms. (Same collection.)

. Showing the arm facets. (Same collection.)

. Showing the basals. (Same collection.)

EUCALYPTOCRINUS MAGNUS Worthen : .. . . . . «© s) soto

Dorsal aspect of the calyx. (After Worthen, the basals corrected.)
Side view of Miller’s type of £. Gorbyi. (After Miller.)

Eucatyrrocrinus LinpAHLI W.andSp.. ..... . « = 5 off

A fine specimen with arms. (Illinois State Collection.)

EUCALYPTOCRINUS ORNATUS Hall . . 2 9 95 9c) ase LO

. Internal cast of the dorsal cup. (Coll. W. and Sp.)

EvucALYPTocrinus EGAnr S. A. Miller. © 3 922 erence

. Internal cast of the calyx. (Coll. W. and Sp.)
2. The anal tube. (Coll. W. C. Egan.)

EuUCALYPTOCRINUS TURBINATUS 8. A. Miller. . ..... =. ~~ ool

. Internal cast of calyx. (Coll. W. and Sp.)

EucALYPTOCRINUS PROBOSCIDALIS Miller. . ..... . . . oos

Internal cast; the type specimen. (After Miller.)

Evucatyprocrinus pecorus Phillips.

5. A specimen from Dudley, England. (Coll. W. and Sp.)

Figured for comparison with &. decorus Hall.

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PLATE LXXXIII.

PAGE

EUCALYPTOCRINUS INCONSPECTUS Ringueberg . . .... . . 346
1. The type specimen. (Coll. Dr. Ringueberg.)
2. A specimen with arms. (Same collection.)

KUCALYPTOCRINUS DEPRESSUS 8S. A. Miller. . .... . 5 = 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%. Basal aspect of another specimen. (Same collection.)

EUCALYPTOCcRINUS camLAtus! Hall) <> = 2)
5. A plump specimen from Rochester. (Coll. W. and Sp.)
6. A crushed specimen from Lockport, showing the ornamentation. (Coll. Dr.

Ringueberg.)
7. A very young specimen referred to this species with some doubt (#). (Mus.
Comp. Zoél.)

KUCALYPTOCRINUS TUBERCULATUS S.A. Miller . . . - = = = sav
8. One of the type specimens. (Mus. Comp. Zodl.)
9. Another type specimen. (Same collection.)
10. Type of &. muralis Ringueberg (from his collection).

EUCALYPTOCRINUS VENTRICOSUS W.and Sp. ...... . «. o4i
11. Specimen with arms. (Mus. Comp. Zodl.)
12. Dorsal aspect of the calyx. (Coll. W. and Sp.)

EUCALYPTOCRINUS OBCONICUS Hall. =) <i ees SS
13. Natural cast of the dorsal cup. (Coll. Thomas A. Greene.)

CaLLicRinus BreacHteRI W.and Sp. . . . = = = = =) s-eeeansDO

14a. Lateral view of the calyx. (Coll. W. and Sp.)
14), Another view of the same specimen, showing the partition walls to their

full length.

GALLICRINUS coRNUTUS Hall 2 5 2) 2 5 ee) een ene ET

3. Natural cast of the calyx. (Coll. Thomas A. Greene.)

Impression from a natural mould. (Same collection.)

. Probably an undescribed variety of C. cornutus. (Same collection.)

CALLICRINUS ACANTHINUS Ringueberg .. ..... . « . oO

. Inner aspect of the dorsal cup; the type specimen. (Coll. Dr. Ringueberg.)

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