nis . x j is : nm. ye MEMOIRS OF THE 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. Si Ke Wnseniag (Rst] oN fi at a ia . a #. : ional Musev®23 -- Unrversrry Press: Joun Witson anv Son, Camsripex, U j y € Pa or ‘ on D E Se es | CONTENTS. THE NORTH AMERICAN CRINOIDEA CAMERATA. By Cuartes Wacusmutn and FRANK SPRINGER. PLATES I. TO LXXXIUL. TOGETHER WITH THE ACCOMPANYING EXPLANATION. ae tet ele Lemoirs of the Museum of Comparative Soilogy = ar | AT HARVARD COLLEGE, ; 7 Soe ana eS Ji a eas ‘Ereury-Tanee Piates To ACCOMPANY. — ‘ ru ‘ : en ee X- nos. q : | rf < , a r ‘THE NORTH AMERICAN — es foe ae is GRINOIDEA CAMERATA. | ss By CHARLES WACHSMUTH anv FRANK SPRINGER. : ; EIGHTY-THREE PLATES. | | * ee CAMBRIDGE, U.S.A.: Semeeis Wrinted for the Museum, - tr te May, 1897. . ar PLATES AND EXPLANATION OF THE PLATES. a Pky t i < ge em: i 4 PLATE LI. . 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 cysts PAGE 44. on two of the cirri. From the Keokuk group at Crawfordsville . 43 Stem fragment from the Upper Devonian of Kentucky, with five rows of large cirri, longitudinally arranged 43 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 the stem 46 Terminal end of Stem of LBarycrinus, showing the large asteriform canal of Stem,yandathe linear canalvoithelcieri senna 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 8a, 6. Sections of stem fragments of Barycrinus, showing slits and pores through the walls 46 9,10. Dorso-central Plates, supposed to belong to a species of Heterocrinus. From the Hudson River group at Cincinnati . .... 2... =. 49,51 (All specimens are in the collection of Wachsmuth and Springer.) CRINOIDEA CAMERATA. on See AWS Heliotype Printing Co. Boston. JL Ridgway del . Saran a 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, belougs to Mespilocrinus ; figs. 5, 8, 9, 11, and 12 to Platycrinus ; fig. 6 to Teletocrinus, 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 6 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 Hvansi ; fig. 21 to Periechocrinus Whitei ; figs. 32, 36, and 39 to Cactocrinus ; fig. 40 to Teleiocrinus ; to the five oval pieces shown by figs. 49 to 53 to Platycrinus. a) ef (eel GRINOIDEA CAMERATA. PrAIE omen TGS AM Westergren, del. Heliotype Printing Co, Boston. CRINGIDEA CAMBRATA. wAoiE ail, Ghas.R.Keyes, G Liljevall, A.M-Westergren del. HEPA AG ean: (eh ST aay PLATE III. THE PLATES SURROUNDING AND CLOSING THE PERISTOME. PAGE Fig. la, Cyarnocrinus Ginest W. and Sp. The interradial plates abutting upon the radials preserved, but those covering the peristome removed. (Coll. W. piel Si) 5 S919 oe oo £8 “ee BP SI ee ety a! 1g. Another specimen of the same species, with the interradial plates partly covered by small marginal pieces ; — otherwise in the same condition as mg, jig, (Seine collla@hiom,)) 2 co o 5s 6 9 & 5 6 a 9 © o oo o 2 2. CYATHOCRINUS BREVISACCULUS W. and Sp. (Ms.). Showing the disk ambulacra and the madreporite; the large interradial plates exposed to view. (The figure is drawn with the anal side up. Samecollection.) .. . . 96,114 3. CyATHocrinus Noposus W. and Sp. (Ms.). Like fig. 2; but the orals still more asymmetrical, and the interradial plates covered by marginal pieces. (Same collection.) Pe wey rg gy Moshe 96, 114 4. CYATHOCRINUS MULTIBRACHIATUS Hall. Like fig. 3; but with the orals nesomoscl, (Same qollleeiiom,) . 2. so 6 5 0 © 0 6 4 5» o 6 5 whey 1K EUSsPrrocrinus sprrAnis Angel. Interradial plates exposed, very large, en- closing large covering pieces which close the peristome. (Drawn with avail suc) yo, Aorol, Ikalkes Nibues, Sindeobe)y “2 G 5 G 5-6 5 g a 5 wo 6. CyaTHocrinus ALUTAcEUS Angel. Arrangement of orals as in Platycrinus, asymmetrical; surrounded by small perisomie pieces. . (Same collection.) 96, 114 or 7. The same species. The oral apparently in process of resorption. (Drawn with anal side to the left. Samecollection.). ...... . . 98,114 8. Cyarnocrinus tmvis Angel. The orals partly resorbed. (Drawn with amall ile myo, Semoe colllacnon)) >< ¢ o o 9 o 6 ¢ 4 9°9 a go Woy IL 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 mxspinrrormis Goldf. The orals resting upon the radials. 12a. Posterior side of the oral pyramid. 12b. Ventral aspect of the same. (Coll. W.andSp.). . . . . . . . . 92, 93 13. Myrrinnocrrnus americanus Hall. Orals as in the preceding genus. @XimeneNinswiNaty busty NWewsvork.)y. - 2 wu t, 2 - = 4 » = 89 14. Coccocrinus rosAcEus F. Roemer. The orals symmetrical; separated from the radials by a single interradial plate. (Coll. W.andSp.). . . . 89, 90 Fig. 15. PAGE Ip1ocrinus vENTRICcosus W. and Sp. The orals represented by an un- divided disk which is surrounded by five interradial plates not shown in wine wee, (Senme Colleton) s 6 6 6 6 6 6 6 © 5 6 6 6 6 go HE . PLuarycrinus symMMerricus W. and Sp. The orals almost symmetrical. (Samercollection®)) yy hak: sie) ae nees ence @e0 er een mG 75 . PLaryorinus piscoiprus Q. and Sh. The orals more asymmetrical. (Same Holblcteintoyny es ameeonc Soo) Ot lethal oc of o 8 6 6 5 GY) OL TIS ERETMOCRINUS CoRoNnATUS (Hall). The orals distinctly asymmetrical. (Same olllan oh) kere Guror on oa dat OMe ios oo 6 om 6. ol oo yO TALAROCRINUS DECoRNIs W. and Sp. The posterior oral extremely large, the other four unrepresented. (Same collection.) . ...... .. 88 DoryYcRINUS MissIssIpPreNsis Shum. The orals unusually asymmetrical. (Gomme collleenom) 6 5 5 8 5 6 6 6 6 0 6 00 6 6 oo 5b BBS . EuTRocHOCRINUS CHRISTYI Shum. The orals excentric and asymmetrical. (Rene COleRO) Sono ola 6 Soe ls 6 a8 4 coe Gg oo CG. AGARicocRinus WorTHENI F. Roemer. The orals separated from one an- other by perisomic plates. (Same collection.) ......... . 88, 89 Marsupiocrinus prepressus Angel. The orals quite small and asym- metrically arranged. (Same collection.). ... 4.2.2.2... . 88,89 Ruopocrinus Waiter Hall. The orals altogether unrepresented. (Same collection.) -imey..ghey 25 Gaia ae) (ult ok Speer ee Oe ee SYMBATHOCRINUS WaAcHsmMuTHI 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, ?.) 10. ®), 20. PLATE IV. 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 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 Cast of an Hutrochocrinus Christyi, showing impressions of the lining covering (Ho nome loo Oe HNO GSK 4 6 6 5» 6 0 6 © 6 Oo 6 6 bu Cactocrinus glans, showing fragments of the convoluted (digestive) organ, and to the left the subtegminal ambulacra of one ray (?) (In the following specimens— Figs. 9 to 17—a second anal opening is introduced at various parts of the calyx, the regular aperture having probably been obstructed.) A specimen of Batocrinus, in which a new opening has been formed between the basals toward the anterior side . . . A specimen of Batocrinus subequalis, with an abnormal opening directly above the basals, involving the whole of the right posterior side of the dorsal cup (slightly enlarged) from the tegmen . A Steganocrinus pentagonus, with a second anal tube given off near the base A Batocrinus laura, with a second tube given off from the base of the origi- The anal tube of Hutrochocrinus Christyi with a transverse lateral branch . . Another tube of the same species bifurcating above the tips of the arms . . . 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.) ‘1. Ventral aspect of the internal cast of a specimen of Teleiocrinus, with ap tegminal ambulacra resting against the inner floor (?) . 102 The same aspect in a natural cast of Physetocrinus ventricosus . 102 The same in a cast of Physetocrinus ornatus . 102 Mhetsame sea castiokySiococniusuneg WUtS ae nse ee enn 102 . 102 . 136 A oa Sa ee a . 136 . Asmall specimen of Teleiocrinus wmbrosus, with a second tube passing out . 136 of the regular one eee S ee. S bh bole & gy IBID . A malformed specimen of Hutrochocrinus Christyi, with a second tube formed above the arm bases . 186 nal one and a third tube apparently in process of formation. . . . . . 135 . A specimen of Macrocrinus jucundus, in which a small tube branches from (Hn iauereME Re OVE 15 bo 8 oe Hee 6 Op se oo 4 6 oo 6 6 1B 135 136 PLATE IV. GRINOIDEA CAMERATA. Heliotype Printing Co, Boston. AM.Westergren.0. St.John, del . Ma Ri ahe ony ay a 4 vat Paes a ie a Wate mn | PLATE V. THE CoNVOLUTED ORGAN, AND THE STRUCTURE BENEATH THE TEGMEN. AG Fig. 1. A specimen of Teleiocrinus, showing the convoluted organ, and portions of fia ambulacral skeleton, both heavily coated with silicious matter (?) . 106, 143 2, The same organ in Cactocrinus, showing the partition which forms the second convolution, the outer wall being removed . sri cena. PY egies aur OG) 3. A Teleiocrinus wmbrosus, with the whole convoluted organ intact (slightly en- larged : ee eel aS 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 Agaricocrinus, 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 vernewilianus . 106 8. Lateral view of the organ in MW. verneuilianus ; its upper end surrounded by EhmehoMbbe recite Gg 6 lo oe otee eb es m 6 6-5 oo JOR LAR 9. The convoluted organ in a specimen of Strotocrinus . : 5 AS} 10. Cactocrinus proboscidalis, showing a portion of the ambulacral skeleton, and the convoluted organ beneath 3 St Le celle Una We . 107 11. Cactocrinus thetis, showing the delicate network of the convoluted organ . . 148 12. Dorsal aspect of the organ in Hutrochocrinus Choistyi (enlarged) . 148 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 oe AWS : Ge charred . 106 16. The inner floor of the tegmen of a specimen of Zeleiocrinus rudis ; heavily GomnieGl Watiln SubighoNs MIE 5 5 6 » o «0 ¢ 6 oo o o 6 oe 6 LOG, LOR 17. The inner floor of Batocrinus inornatus, formed into open galleries for the reception of the ambulacra (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 Zodlogy.) . 106 = ee CRINOIDEA CAMERATA A.M. Westergren., del. PLATE V. Helictype Printing Co, Boston. PLATE VI. CRINOIDEA CAMERATA. fa 26 ta 1b Heliotype Printing Co, Boston. J.L.Ridgway del - PLATE VL (Figs. 1 to 12 are represented to show the orientation of the stem and axial canal among Neozoic Crinoids; figs. 18 to 20 the close affinities between the Ichthyocrinide and Comatule.) PAGE MITE EMRICRINUSOREIGN Ides worioly ness 6 6s. «. a. . Of 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, Pl. 116, fig. 1.) 1d. 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 ; iid., fig. 1c.) MILGERICRINUS) POLYDAGTYGHUS de Toriol . ..... ... «62 2a. The infrabasals attached to the truncated upper end of the stem (lateral view). 2b. Ventral aspect of the same. (Both after de Loriol; zid., Pl. 110, figs. la, 2a.) MirrnRiChiNusmlOCAUNENSTSsde Worle asses a. 2. . . OL 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; zdid., Pl. 61, fig. 5d.) Wiiinimecimonos Winer CUOMoemy, 3 6 5 5 5 6 6 6 5 6 a mol 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. (Jbid., Plate 96, fig. 2a.) Witmmmencininos: ChimAinomsiir ce lom@l 5 5 5 6 o o 56 6 8) 5 al 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. (Jdid., Pl. 59, fig. 3c.) MILLERICRINUS MUNSTERIANUS @Orbigny ........ . 62 6. Top stem joint, showing the angular ridges upon the upper surface. (After de Loriol ; zdzd., Pl. 83, fig. 2. PAGE IREHCAOCIMO OR IY ysOn Jones 5 5 5 6 6 5 6 0 6 o 5 gl) OB 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. (lbid., fig. 14.) Paicrinas AgiEAS Wi, INn@igON. 5 s so o os 0 5 2 0 5 8. Dorsal aspect of the cup; the empty space within the basal ring interradially disposed. (Carpenter, idid., Pl. XIL., fig. 16.) Murdcrinus ANGUBATUS) Pe Hl. (@arpenter 9) 5 GD 9. The space within the basal ring, contrary to preceding figure, radially dis- posed. (After Carpenter ; did., fig. 2.) BATHYCRINUS ALDRICGHIANUS P. H. CARPENTER. . .... . 685 10. Horizontal section of the basal ring. (After Carpenter; 7bid., Pl. VITO. fig. 2.) 11. The infrabasals of OnycHocrinvs, coalesced with the top stem joint. (Coll. AWARENVONSIOM Gl ag 6g glo aattiso Jot Lod Gb oi uo te ouo of a OH 12. Dorsal aspect of the Base of Guyprocrinus precapActy us; the interradial outline of the upper stem joint taking its form from the basal concavity. (Game collegsom)) 2. 6 5 0 9 6 6 2 oo oa tb oo ll 13, 14, and 15. Pentacrinoid larve of Anrrpon. (After P. H. Carpenter; Chall. Rep. on the Comatule, Pl. XIV.) : Re rio aol cc 16. A young Taxocrrnus from the Burlington Limestone. (Coll. W. and Sp.) 152 17. A young OnycHocrinus from the Keokuk Group. (Same collection.) . . 152 Aayiimmyony TROSAGIA Iban 5 5 2 o 5 s » 6b 6 6 5 5 oo ow UY 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. (Jdid., Pl. XX XVIII.) Onmcrociarus Wimmiene ts AN Wille 4 5 5 5 6 6 6 co 5 0 EY 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, 46, 6, 19, 20 with the radial side up.) Fig. 11a. PLATE VII. SCAPHIOORINUS ELEGANS W. and Sp. (MS.) 1a. Anterior side of the specimen, showing the ventral sac and the anal open- ing low down in the sae. (Only the lower half of the specimen is drawn.) 1d. ‘Posterior side of the specimen. (Kaskaskia group, Kentucky.) ScyTALOCRINUS VALIDUS 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. DECADOCRINUS 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. A specimen showing the posterior side of the sac. (Keokuk group, Craw- fordsville, Ind.) or ScAPHIOCRINUS UNICUS Hall . 6. Posterior side of a specimen, showing the ventral sac to its full length. (Locality and position same as last.) ScyTALOCRINUS (sp. undet.) . cal Anterior view of ventral sac, showing the pores along the sides of the plates, and the position of the anus. (Kaskaskia group, Kentucky.) Scaputocrinus Swauuoyi 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 Autocrinus AGcasstzi W. and Sp. (MS. Nov. gen. and n. sp.) . (avdos a small tube, xpivoy a lily.) 9. Right postero-lateral aspect. Anus at the end of a special tube, given off half way down from the anterior side of the ventral sac. Sac and tube profusely perforated by pores. (Keokuk group, Indiana.) C@LIocRINUS VENTRICOSUS (Hall) . 10a. Posterior side of the ventral sac. 10d. Anterior side of it. CyATHOCRINUS Noposus W. and Sp. (MS.) The anus at the end of the ventral sac slightly excentric in position, and closed by eight or nine plates forming a pyramid. 11d. Distal end of the ventral sac enlarged. CYATHOCRINUS BREVISACCULUS W. and Sp. (MS.) 12a and d. 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.) PAGE 138 138 138 138 138 138 138 138 137 VIL. Boston. PLATE Heliotype Printing Co. AAvaN aay i ays es a SAR ETERS, CRINOIDEA CAMERATA. A.M.Westergren del. ; Lane oF Nene oe ‘ ~~ ‘ iy - - PLATE VII. LO CRINOIDEA CAMERATA; & Eoaneet” nt eels ” Tiaue PAsehit Veda) aareirers atteis Tit iat abate e Nr ES at Heliotype Prinung Co, Boston. G Liljevall, Chas R Keyes del. PLATE VIII. PAGE HARV AMO BOCES Komen Amel 5 5 5 5 5 56 5 5 6 6 4 CEM ig. 1. Showing arrangement of the plates in the calyx, and structure of arms and pinnules. (Drawn by Mr. G. Liljevall from a specimen from Gotland in the Zoél. Riks Mus. at Stockholm) (2). Crom TOChINUsmRUMOHER NM (HISIMSeD) a. es. 2 . . . a 164 2. A specimen from Gotland, showing the net formed arms. (Coll. W. and Sp.) CRODATOCRINUSHN nS Dy ICH INC To suse 45 4 « 5, LGA 3. The tegmen of a specimen from Gotland; drawn by Mr. G. Liljevall (Zodl. Riks Mus., Stockholm) (2). CROTALOCRINUS RUGOSUS (J. S. Miller). ........ =. 164 4, Tegmen of a fine specimen from Dudley, Eng. (3). (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. 50. 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 (#7). 6). Proximal face of the same (J). 6c. Lateral face of an interradial plate (2). (Same collection.) Shiminanme@cravus Syranmowm IM. . oo «0 6 0 56 6 o 5 5 NBS 7. A specimen with arms, from the Keokuk group of Canton, Ind. (Coll. W. and Sp.) SYMBATHOCRINUS WacHsmuTHI M.and W:. ....... .. 89 8. A specimen with the arms removed at the posterior side, exposing some of the plates of the anal tube, and the asymmetrical orals. (Coll. W. and Sp.) 9. Another specimen also showing the orals, and the base of the anal tube (2). (Same collection.) PiSOCRRTUS (Gd inlets) 5 o 5 0 1 6 «6 9 a 0 6 ow n 9 IRB 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. 8. A. Miller, in the 17th Report of Fig. 11. 12. 13. 14. 15. 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.) ALLAGECRINUS CARPENTERI W. and Sp.. The type specimen, with two arms in one or more of the rays. (Illinois State Collection.) DUMP UOCMETES AcumGS IBBIS 5 5 » 5 4 5 . « o - A 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 Wacusmurui M. and W. .... . Specimen with arms, ventral tube and stem. (Coll. W. and Sp.) MARSUPIOCRINUS) RADIATUS) Angel; 24. 4 5.5 ce The tegmen, with small, regularly arranged covering pieces (4). (Drawn from a specimen in the Zoél. Riks Mus., Stockholm, by Mr. G. Liljevall). 46 103 ta Oi, Py 7 di Fig. 1a. > 5a. 5d. 5e. bd. 6a. 6. 7a. Tb. 7 (Cc. PLATE IX. PAGE Iuamoocmos Oxivivaa Osh) ~ . 9 5 o 6 2 6 0 oo on HAY Anterior view of a specimen with arms (?). (Coll. I. H. Harris.) Posterior view of another specimen with arms. (Coll. W. and Sp.) . Lateral view, showing ventral disk. (Same collection.) 1d. . Inner floor of the calyx, showing the small supplementary plates which A portion of the ventral disk enlarged. (Same collection.) surround the primary interbrachials (7). (Same collection.) The type of “ Glyptocrinus cognatus.” (After Miller.) ICES mUeKcomeos SG, A Molle . 5 2 56 56 5 6 a oe) US . Side view of a specimen with arms and portions of stem. (Col. I. H. Harris.) IMO CEOS Swipe huems Wilby 5945 5 2 6 5 a 6 6 oo AE . One of the type specimens, posterior view. (Museum Geol. Sury., Canada.) . Anterior view of another type specimen. (Same collection.) Part of the calyx, showing the fixed brachials. (Same collection.) RETEOCRINUS FIMBRIATUS Billings . + ee 179 The type specimen in a lateral view. (Museum Geol. Surv., Canada.) AGoOomoamos Ia (IES). 5 5 5 6 6 6 0 0 5 6 6 ol ol GS 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. GONOCHIOTES RINGO SAL Whee, 2 3 5 5 ok ce el se 5] GB Lateral view of one of the types (?). (Same collection.) Posterior view of another type specimen (2). (Same collection.) TUCO GAD We GOEL IS 5 3 6 4 o 5 0 o e 0 a 0 IEG Posterior view of a type specimen (?). (Coll. W. and Sp.) Anterior view of another type specimen (7). (Same collection.) The stem, enlarged. CRINOIDEA CAMBRATA. Heliotype Printing Co, Boston. i Chas.R.Keyes de era eat r PLATE X. PAGE ARCHHOCRINUS LACUNOSUS (Billings). . ...... .. =. 255 Fig. 1. Posterior view of the type specimen. (Museum Geol. Surv. Canada.) ARCHHOCRINUS MICROBASALIS (Billings) . . ...... . 256 2a,- Specimen with arms and stem. (Coll. John Stewart.) 2b. Another specimen. (Same collection.) 2c. Basal aspect. (Same collection.) ARCHMOCRINUS PYRIFORMIs (Billings). . ........ . 255 3a. The type specimen. (Museum Geol. Surv., Canada.) 3b. 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. BR. Billings.) 4b. Dorsal aspect of the calyx. (Coll. W. and Sp.) DIABOLOCRINUS HIEROGLYPHICUS W. and Sp.. ... .. . . 252 5a. Dorsal aspect of a large specimen. (Coll. W. and Sp.) 56. Side view of the same. 5c. Anal side of a small specimen. (Same collection.) (Figs. 2c and 5a are drawn with anal side up.) 4 5 3 f é : é & 8 ES . : inal C iit ; ; ia auietsl UHHH /PIFLL NEON pUet tee bel pula Li iS é < ioe iy a N oO : Q 2) ay é : ae a E i - PLATE XI. PAGE IDA OOOO mAs Wo aml Sj 6 so os co 6 6 5 oe 6 wl Bw Fig. 1a. Dorsal view of a large calyx, showing very small supplementary pieces along the sides of the radials and between the interradials. 1b. Ventral aspect of the same. IDIAROROCEUNES Wasim Wit, » 2 « o s © o 5 «6 « 5 PE 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. Zodl.) InzuaemusOonacros) Gowns) (OIE) 595 5 5 5 5 4 56 o «6 4 AG) 3. A specimen with arms. (Coll. I. H. Harris.) IirROCToNOTS wins Cell), o 6 6 5 6 5 0 0 5 6 no 5 AB 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.) 4d. 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.) IbraOCIManos mAGmTnDs Ila, 5 4 6 o o 4 6 6 0 6 6 0 « BEY 5a and 6. The types. (Amer. Mus. Nat. Hist., New York.) 5¢. Specimen showing the pinnules. (Mus. Comp. Zoél.) Ruopocrinus WortHenr Hall ... . Poe eed ei os tol gt 0) 6. A slightly crushed specimen with arms. (Mus. Comp. Zod.) IReCuooraornors weAsom IL, amyl WYo 6 6 5s 6 56 6 6 6 56 0 ol oo BRS 7a. The type specimen, lateral view; from the Burlington Limestone. 7b. Ventral aspect of the same. (Mus. Comp. Zodl.) “XL. al PLATE Heliotype Printing Co. Boston tana bsuaubpRSAethy NUTT) Ay Meek Gid ce hAl aS cece CRINOIDEA CAMERATA. Chas.R. Keyes, A.M-Westergren del. es GA nee ee wer ce Fig. 1a. 10. IG, ih, 2b. PLATE XII. Ruopocrinus Kirpyr W. and Sp. . Specimen with spreading arms. Another specimen with arms and column, anterior view. Posterior view of another specimen. The calyx, posterior view. Ruopocrinus NANuS M. and W. . Anterior view of a specimen with stem. Posterior view of another specimen. (Both from the Kinderhook group.) Ruopocrinus Barrisi Hall A small specimen with arms. . A very large, nodose specimen; dorsal aspect of the calyx. Side view of same specimen. Posterior view of same. . Ventral aspect of same. . Lateral view of another specimen. . Dorsal aspect of same. Ruopocrinus BARRISI, var. STRIATUS W. and Sp. . 6. Lateral view of dorsal cup. Ta. 7d. (ch 8a. 80. Ruopocrinus WorTHENI Hall Specimen with arms. Dorsal aspect of calyx. Ventral aspect of same specimen. Ruopocrinus WorTHENI, var. URCEOLATUS W. and Sp. . Posterior view of the calyx. Ventral aspect of same specimen. RHoDOCRINUS WATERSIANUS W. and Sp. 9. Specimen with arms and stem. (All the specimens are in the collection of Wachsmuth and Springer.) PaGE 226 - 228 230 5 mshi . 220 221 221 PLATE XII. Heliotype Printing Co, Boston. PS 7 e6, 5b La Za CRINOIDEA CAMERATA. Ghas.R.Keyes del. a . : ot PLATE XIII. PAGE Irusopocmones Wine lel ¢ , 5 3 5 6 0 6 8 eo 5 gl a BBB Fig. 1a. Dorsal aspect of calyx. (Coll. W. and Sp.) 1d. Ventral aspect of same specimen. 1c. Posterior side of same. RHODOCRINUS TRUNCATUS, W.-and Sp. 2 5... © « . 4 + 281 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. 2f. Side view of a very large specimen. (Same collection.) RHODOCRINUS TUBERCULATUS W. and Sp... ..... . . 232 3. Side view of the type. (Coll. W. and Sp.) 4. Side view of a larger and more nodose specimen. (Same collection.) Rooms Wi vosniomene Iefll 6 . 5 5 2 5 5 6 o o 0 5 DY 5a. A large specimen with arms. (Coll. W. and Sp.) 5b. Posterior view of calyx. (Same collection.) 5c. Side view of same specimen. 5d. Dorsal aspect of another specimen. (Same collection.) IREOMOCWINIUS COmorns WOM 5 o 5 6 6 5 1 o 6 4 5 DD 6. The type specimen; lateral view. (Coll. L. A. Cox.) 7. Another specimen of this species, described as Rhodocrinus polydactylus. (Same collection.) INDODOCTU mOoUOSUS IBM ¢ 56 6 5 5 5 6 oe oe oo BOE 8. The type specimen. (After Hall.) IayVerOomomo IBA Wyn 5 5 6 6 » 6 o 5 6 6 9 5 oo IME 9a. 9d. 10a. 100. 10c. 10d. ile, 110. Dorsal aspect of calyx. (Coll. Borden Institute, New Providence, Indiana.) An abnormal specimen. (Same collection.) LAMPTEROCRINUS TENNESSEENSIS Roemer ...... .. . 208 Posterior view of the calyx. (Coll. W. and Sp.) Ventral aspect of same. Anterior view of another specimen. (Same collection.) Portion of the stem. Meradweocrmantos Oivusre We gl Sh co o « o 5 5 5 6 = 0 PES The type specimen, lateral view. (State Cabinet Nat. Hist. N. Y.) Infrabasal disk, showing the stellate column facet. XML. PLATI yy I, Heliotype Printing Co. Reston. D Ga Le _ CRINOGIDEA CAMERATA. Chas.R. Keyes, A.M.Westergren del. ONES rer ‘PLATE XIV. . GIUEURISOCRINUS eevP ise (all) ieee tei ee eee s Fig. 1. Dorsal aspect of a large specimen with the appendages preserved nearly — entire. From the Burlington and Keokuk Transition Bed. 2. Another specimen from the same horizon; side view. — 3. A specimen from the Upper Burlington Limestone with the appendages and portions of the arms preserved. (All epeclione in 1 the collection of Wachsmuth and Spvingen) CRINOIDEA CAMERATA. ' PLATE XIV. Chas. Keyes del. Heliotype Printing Co. Boston. PLATE XV. PAGE GILBERTSOCRINUS TUBEROSUS (Lyon and Cass). . . . .. . . 239 Fig. la. A large specimen showing the calycine appendages. 1d. Another specimen, showing the appendages and arms. GILBERTSOORINUS DISPANSUS W. and Sp... ....-... . 240 2a, Ventral aspect of a specimen, with calycine appendages and arms preserved. 2b. Dorsal aspect of the same specimen. 2c. Lateral view of the calyx. 2d. Ventral aspect of the same specimen. GILBERTSOCRINUS SPINIGERUS (Hall). . . ....... . 247 3a. The type specimen, dorsal aspect of the calyx. 3b. Lateral view of the same specimen. 3c. Ventral aspect of the same. GILBERTSOCRINUS STELLARIS De Kon. and Le Hon ... . . 286 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 ......... . 236 5. Figured to illustrate the differences in the structure of the genus between European and American forms. Mountain Limestone, England. RHODO CRIN US) WVeEmrT: seT cls te een en eee 6a. Side view of a large and very perfect specimen. 6b. Dorsal aspect of same specimen. RuHopocRINUS "WAcusmurHT lal) ) an i een en nRnnnnnEo2 7. Anterior side of the calyx. (All the specimens are in the collection of Wachsmuth and Springer except that illustrated by figs. 3a, 6, c, which is in the Canada Survey Museum at Ottawa.) PLATE XV. Heliotype Printing Co, Boston. AM.Westergren, del. CRINOIDEA CAMERATA. oe os PLATE XVI. PAGE GILBERTSOCRINUS TUBEROSUS (Lyon and Cass). . ..... . 239 . 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.) CRINOIDEA CAMERATA. PALATE EVs e,. = Bey 16 C\ Guat Os : eee Chas.R. Keyes del. Heliotype Printing Co, Boston. PLATE XVII. PAGE GILBERTSOCRINUS RETICULATUS (Hall) ....... 2... 244 Fig. 1a. Dorsal aspect of the calyx. 1b. Lateral view of another specimen. GILBERTSOCRINUS FISCHELUS) (VlsandeVVs)) steep eeeneeto 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. Ci CoRmmus OHoyAmos GUL, acl WW) 5 5 0 5 5 5 o 0 5 WE 4a. Side view of calyx. 4). Ventral aspect of same. (Figure drawn anal side up.) GILBERTSOCRINUS TUBERCULOSUS (Hall). ....... . . 248 5a, A. specimen with arms, appendages, and stem. 5b. Dorsal aspect of another specimen. 5c. Ventral aspect of same. GILBERTSOCRINUS TUBEROSUS (Lyon and Cass) . ..... . 289 6. Dorsal aspect of calyx. Chimica manos Cell), 5 5 5 56 6 6 0 5 0 6 0 5 BY Ta. 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.) GRINOIDEA CAMERATA : PLATE XVI. Ja 26 Ze Za : Lb ve. PX, Gt ps4 La ED i, Chas. R.Keyes del. Heliotype Printing Go, Boston, PLATE XVIII. PAGE Pimgiooneros imvanog (silly ¢ 5 6 6 5 o 6 6 6 » o 0 o 1D Fig. la. View of the specimen described by S. A. Miller as Glyptocrinus angularis (3). (oll. 8. A. Miller.) 1. Another specimen with the arms better preserved (7). (Same collection.) 2. The specimen described by Wetherby as Glyptocrinus (Reteocrinus) gracilis (2). (Coll. Mr. Vaupel.) IBnGetcimenays Giacomo: CumleM)y., oO 5 5 5 & 6 « 5 of 5 o JGR 32. The type specimen (#). (Coll. S.A. Miller.) 3b. Another specimen (?). (Same collection.) THYSANOCRINUS LitliroRmis Hall . . ......... ~~. 192 4. The type specimen. (Museum of Cornell University.) MESA CCRAA CQtomDMs (sell; § S 2 5 o 6 6 5 5 5 IE 5a. Side view of calyx (?). (After Hall.) . 5b. Posterior view of calyx. (After Hall.) 5c. Dorsal aspect of calyx (7). (After Hall.) AAVNOCMeUS TNOmNAmoS (SEI) 5 5 6) 5 6 6 6 5 6 5 6 o IB 6a. Anterior view of calyx. (Coll. W. F. E. Gurley.) 6). Posterior view of same specimen. Ge. Ventral aspect of same (#). 6d. A young specimen, probably of this species. (Same collection.) MENA Ooms uO Oa) 5 o> 5 5 5 o 5 6 0 a 1K 7. Dorsal aspect of the type specimen; the matrix removed so as to show the pinnules and the arrangement of the plates. (Am. Mus. Nat. Hist. N. Y.) IinMOYesAGSMO) TIMOR TNO Wis ail IS 2 5 5 5 o o 3 « 2 o 5 AB 8a. The type specimen; side view. (Coll. W. and Sp.) 8b. Ventral aspect of same (4). 8c. Another view of the ventral disk (?). (Anal side to the right. Coll. W. and Sp.) IDIOCRINUS) VENTRICOSUS! IW. and) Spye) a ermen i ies ce eeeneZOb 9a. The type specimen; side view. (Same collection.) 9b. Dorsal aspect of the dorsal cup. (Anal side to the left. Same collection.) IpIocRInvs ImMATURUS (Hall) . ..... . so 9g AE 10a. The type specimen; anterior view. (Am. Mus. Nat. Hist. N. Y.) 10. Posterior view of same. 10c. Dorsal aspect of same. (After Hall.) IpIOCRINUS TENNESSEENSIS (Worthen) ......-. .- - 206 11. The type specimen. (lllinois State Collection.) XVII. A PLATE CRINOIDEA CAMERATA. Jb Ja Lb Ble Heliotype Printing Co, Boston. Chas. R Keyes. A.M .Westergren del. PLATE XIX. PAGE SaTOMOCmErOs wOums Cs) . 5 5 6 2 2 0 6 6 co 0 a 0 AY Fig. 1a. Gutta percha cast made from a natural mould. (After Hall.) 1b. The quinquepartite infrabasal disk. 2a. Internal cast, showing the arrangement of the ambulacra upon the left side. (Coll. T. A. Green.) 2b. Lateral view of a similar cast, showing their arrangement at the right side. (Same collection.) 2c. Ventral aspect of another cast. (Same collection.) SIPONOGMAN US AriOsUR) WGN? 5 5 o 6 6 40 6 1 o 9 9 ZAlil da. 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.) 3b. Another specimen, showing the right side of the calyx. (Same collection.) 3c. Ventral aspect of another cast. (Same collection.) SIPHONOCRINUS PENTAGONUS W. and Sp. ......... 2138 4a. The type specimen; lateral view. (Same collection.) 4b. Ventral aspect of another specimen. (Same collection.) REwsArOCRINTS uNOmAnUS Cala), o ¢ o 5 6 0 6 6 5 0 5 HGS 5. Dorsal aspect of specimen with portions of arms. (Coll. W. and Sp.) IEDASMOGENUS TAPS Wo Bmdl S06 o ¢ 56 5 5 9 8 0 5 o 9 Adil 6a. Dorsal aspect of the specimen described by Miller as Cyphocrinus Gorbyi. (After Miller, drawn with the anal side down.) 6b. Lateral view of calyx. (Coll. W. and Sp.) 6c. Ventral aspect of calyx. (Same collection.) PLATE XIX. Heliotype Printing Co. Boston. CRINOIDEA CAMERATA. Chas.R. Keyes, AM. Westergren del. Dike ea PLATE XX. PAGE Chivaxnoeromus Dram (Wee) ¢ 6 so 6 6 60 6 6 5 op a 6 AO Fig. 1a. A large specimen with arms. (Coll. I. H. Harris.) 1b. Posterior view of a large, flattened specimen of the type of Gl. Richardsoni Wetherby, showing the fixed pinnules. (Coll. W. and Sp.) 1c. The base, showing the angles of the axial canal to be interradial. (Coll. Mr. E. H. Vaupel.) Giawenocmanos mAmeiganws Iillbines 5 5 o co o 0 5 ¢ 0 0 56 Me 2. The type specimen; postero-lateral view. (Mus. Geol. Surv., Canada.) Coramocimmeus MMomgieco Nibiee . 2 5 6 5 6 6 6 go 5 0 oo ANG 8. The calyx and part of the stem. (Coll. I. H. Harris.) Chirac maa hill, 5 2 2. 6 5 6 6 0 6 oo BO 4a, A very large specimen. (After Meek.) 4b. Posterior view of calyx. (Coll. I. H. Harris.) 4c. Ventral aspect of a rather small-specimen (7). (Coll. E. O. Ulrich.) 4d. Ventral aspect of an older specimen (%). (Coll. W. and Sp.) de. Portions of the arms, showing covering-plates (¢). (Same collection.) Chrasmooinmnns imAnonosus WU 5 6 5 6 6 6 6 oo og 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.) Chyasnoommas Gms Whe 6 5 5 6 6 0 6 5 0 5 6 o AOE 6a. The type specimen; anterior view. (Mus. Geol. Surv., Canada.) 6b. Posterior view of same specimen. CRINOIDEA CAMERATA. = i Chas. 8. Keyes, del. PLATE SOX. Heliotype Printing Go. Boston. Fig. PLATE XXI. Prerictyprocinus Binitinesr W. and Sp . 1a. Posterior view of a specimen with arms and stem. (Coll. John Stewart, now in the Canada Survey Museum at Ottawa.) 1d. Another specimen in the same collection, showing the left postero-lateral ray and anal interradius. PERIGLYPTOCRINUS PRISCUS (Billings) . 2. The type specimen. . (Museum Geol. Surv., Canada.) Guyptocrinus DyzEri (?) 3a—c. Young specimens, probably of G. Dyeri (2). 3d. Type of Miller’s Pycnocrinus Shafferi (2). (Coll. S. A. Miller.) é 8e. Type of Miller’s Pycnocrinus Shafferi, var. germanus (Z). (Same allaaiiton, ) 3f. A somewhat larger specimen (2). (Coll. W. and Sp.) GLYPTOCRINUS DECADACTYLUS Hall 4a. Inner floor of the dorsal cup (7). (Coll. E. O. Ulrich.) 4b. Interior view of the basal cup (7). The angles of the axial canal directed interradially. (Coll. W. and Sp.) GuyrPtocrinus FornsHELLI Miller . 5. Interior view of the basal cup (}4). ‘The angles of the axial canal directed radially. (Coll. I. H. Harris.) 7 Guyrrocrinus DyErr Meek 6. Calyx, showing the posterior side of a large, highly ornamented specimen. (Coll. E. O. Ulzich.) Compsocrinus miAmMiENSIS S. A. Miller. 7a. The type specimen; posterior side. (Coll. I. H. Harris.) 7b. Anterior view of another specimen. (Coll. W. and Sp.) Compsocrinus Harrisit 8. A. Miller . 8a. One of the type specimens; lateral view (?). (Coll. I. H. Harris.) 8). Posterior view of another type specimen (2). (Same collection.) PAGE 277 278 271 270 518 517 PLATE XX]. pe Printing Co. Boston. 7 Heliotyy Chas R. Keyes, del. CRINOIDEA CAMERATA. PLATE XXII. GRINOIDEA CAMERATA. fa Heliotype Printing Co. Boston. Chas. R. Keyes, del. PLATE XXII. PAGE MArIAcRINUS WARRENI Ringueberg .......... . 283 Fig. 1. The type specimen. (Coll. Dr. E. N. 8. Ringueberg.) NoMeuNermonos Camcmnar Qala) 5 6 51 5 6 6 o 6 680 6 0) oo AH, 2a. Postero-lateral view of calyx. (Coll. I. H. Harris.) 26. Anterior view of same specimen. 2c. Ventral aspect of the same. iineryoommnas Seanosws CEE) 5 6 G6 oo 3 6 6 6 6 oo GU) 3. The type specimen. (Am. Mus. Nat. Hist. N. Y.) MEtocriInus BAINBRIDGENSIS emaTCGs Wie tee ce 2 no yee ere 297, 4a. The type specimen; side view. (After Hall and Whitfield.) 46. Dorsal aspect of same. 4c. The arms. (After Hall and Whitfield.) WimOcmarus CimAcius Wo ail io 56 5 6 6 6 0 0 6 6 oo AS 5. The type specimen; side view. (Coll. J. M. Clarke.) WimeOcmaros Canam Wo @mel 6 6 6 6 6 o 6 6 eo oe oo CU 6. The type specimen. (Coll. Prof. S. Calvin.) NiimOcmmrns Atma WY acl Se 6 o co co 6 0 5 6 oo MEY Ta. The type specimen; right posterior view. (Coll. A. S. Tiffany.) 76. The basals of same. MUO CHIN USE Ar MUSH ee ans Del tomeD snr tn) bela en O03 8. The type specimen; anterior view (14). (Coll. W. and Sp.) NMTOCRINTETS OmiOmco Wo gal So co co 6 6 6 0 0 6 6 5 6 All) 9. Lateral view of a very elongate calyx. (Coll. W. and Sp.) Nibrocmyus OncOxucos Isp > 5 ¢ 6 «6 o 50 6 4006 6,0 Gly 10a. Lateral view of calyx. (Same collection.) 10d. Ventral aspect of another specimen. (Same collection.) 10c. The basals. Nimo omines Ione Yo aml SO 5 2 6 ¢ 6 6 0 56 6 5 oo oo Bl Fig. 11a. Lateral view of calyx. (Same collection.) 116. Ventral aspect of same specimen. NGMOCTIGS OLONGOES We gal SO; o o 5 o 5 0 0 6 5s 0 9 BOO 12. The type specimen; lateral view. (Coll. W. and Sp.) NAGIROsmrarOcingOg muMycoNEs IML 5 5 5 9 56 29 o 0 6 po oo BSS 13. Lateral view of calyx-44). (Coll. W. and Sp.) MACKOSINAOCRETUs Smee Jl 5 o 6 6 6 o o 5 56 0 a PSH 14a. Lateral view of calyx G#). (Same collection.) 14). Posterior view of another specimen (44). (Same collection.) 14c. The basals. MAcROSTYLOCRINUS GRANULOSUS Hall ......... ., 289 15a. Lateral view of calyx (44). (Coll. W. and Sp.) 15d. Anal view of same specimen. MUNGO acoso) Muse Obiyom) 7 5 56 5 6 4 9 5 0 2 0 1» AM) 16a. The type specimen; lateral view. (Coll. Borden Institute, New Provi- dence, Ind.) 16d. Dorsal aspect of calyx. (Coll. Sidney S. Lyon.) oa Cd Sl PLATE XXIII. PAGE NbrOOMesTs mommies (sell) , , 5 6 5s 5s 5 9 56 oo 5 DOE . The type specimen. (Amer. Mus. Nat. Hist.) . Diagram showing the arrangement of the plates. . Portion of one of the radial trunks, showing the origin of the arms. (After Hall.) / VGTOOmRNTS BACEmDACHaS Cell 5 . 5 5 5 6 oo oo o BM . The structure of the radial trunks and the origin of the arms. (After Hall.) . The type specimen of “ Mariacrinus” paucidactylus Hall. (After Hall.) Or > NUSAGHIToS aamOsuS Tl 6 6 6 5 0 6 5 6 6 0 5 0 g Be 6. The type specimen. (After Hall.) 7. Dorsal cup of a larger specimen. (After Hall.) WINGOSnOC OES Ormiaas IRM, 5 6 56 50 6 6 6 6 5 0 oo BE 8a. The type specimen. (After Hall.) 8d. One of its radials, enlarged. 8c. A portion of an arm, enlarged. MACROSTYLOCRINUS FUSIBRACHIATUS Ringueberg. . . . .. . 291 9. The type specimen. (Coll. Dr. E. N. 8. Ringueberg.) 10. A smaller, somewhat distorted specimen. (Same collection.) LATE XXII. a CRINOIDEA CAMERATA. Hehotype Printing Co. Boston. Chas.R. Keyes, AM Westergren del. PLATE XXIV. PAGE AIROCMENUD DCO IjyOM .o o 6 0 6 6 6 eo 0 6 0 5 oe Be Fig. 1. The type specimen; dorsal aspect. (Coll. 8. S. Lyon.) ISUIOROC ONO TENSIONS ILO 5 5 o 6 0 os 0 6 56 56 0 5 BS 2a. The type specimen; dorsal aspect. (Coll. 8. 8. Lyon.) 2b. Inner floor of dorsal cup. (Same collection.) iermocwoarus Aummsyen Jel o 2 2 6 o 2.5 2 6 5 op ow 5 BUG 8. The type specimen, after Hall. (From a gutta percha east made from a natural mould in sandstone.) NiTOCHOTUS PACanmACmTS Call) 5 2. 1 5 5 6 6 0 0 co 5 AG 4a. The type specimen. (After Hall.) 46, 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) 9) see ee nee zo 6. The type specimen. (After Walcott. Coll. Mus. Comp. Zodl.) AuOCROTOS MaeWS Wo Gal Sho co «0 o 56 © 6 0 0 0 ol BY 7a. Side view of one of the types. (Coll. W. and Sp.) 7b. Basal view of same specimen. ArmOCMENs INCH IS Ay WOME 5 5 5 6 6 0 0 0 0 6 0 SO 8a. Side view of calyx. (Same collection.) 8d. Basal view of same specimen. PLATE XXIV. ae sta Ne me CRINOIDEA CAMERATA. Hehotype Printing Co. Boston. Ches.R. Keyes, del. PLATE XXV. y PAGE IDORANO CRIES TAMU WY, GmGl Ss > 5 56 0 « 6 6 5 6 co Cuil Fig. 1, Dorsal aspect. (Coll. Victor W. Lyon.) Dotatocrinus Marsui, var. HAMILTONENSIS W. and Sp. .. . 314 2a. Dorsal aspect. (Coll. Victor W. Lyon.) 2b. Ventral aspect of the same specimen. DoLaTocRINUS TUBERCULATUS W. and Sp.......... 324 8. Dorsal aspect. (Victor W. Lyon.) DomAnoCmons sEEcmOsoS el , 6 5 5 6 5 5 oo og oo BB 4a. Dorsal aspect. (Coll. W. and Sp.) 4). Side view of the same specimen. IDOWATOORTATOS MAGOR Wes Gil So 6 6 o 5 5 v 0 ¢ 0 0 0 OWA 5. Dorsal aspect. (Coll. Victor W. Lyon.) IDomAnOCHEES Ibixonn Wo aml Sho oc 5 5 0 5 5 6 5 5s oo SI 6a. Dorsal aspect. (Same collection.) 6b. Ventral aspect of another specimen. (Same collection.) 6c. Side view of the same specimen. 6d. Portion of the tegmen, showing the slits; enlarged. DoLATOCRINUS CANADENSIS Whiteaves . ........ . dtd Ta. Dorsal aspect. (After Whiteaves.) 7b. Ventral aspect of same specimen. STEREOGRINUS TRIANGULATUS Barris . . . . : . =... . « 620 8a. The type specimen. (Museum Davenport Acad. Nat. Sci.) 8d. Side view of same specimen. STHRHOCRINUS! BARRIST VW. ade Spy ens: ) Gale Geli nnnnEZO 9a. Side view of a fine specimen. (Same collection.) 9b. Ventral aspect of another specimen. (Coll. W. and Sp.) CENTROCRINUS PENTASPINUS Lyon... ..- - + + -:.* : + 309 10a. The type specimen; dorsal view. (Coll. 8. 8. Lyon.) 10d. Side view of same specimen. 10c. Side view of another specimen in the Lyon collection. (Described as Actinocrinus multicornus.) Dr amp wy CRINOIDEA CAMERATA. PLATE X AAV. Heliotype Printing Co, Bost GChas.R.Keyes del. eliotyp ag Co, Boston PLATE XXVI. PAGE Drormumoroiaiaios: INCMReuEH Iba» 9 2 2 co 6 0 0 6 0 6 6 0 o BLY Fig. 1a. The type specimen; posterior view. (Coll. 8. 8. Lyon.) 1b. Dorsal aspect of same specimen. 1c. Ventral aspect of same. 1d. Inner floor of the inverted basal cup, showing its derivation from 38 plates. IDOwARoermosnos Gone Isl, 5 . 5 6 0 © 6 6 0 0 9 0 o GY 2a. The type specimen; posterior view. (Am. Mus. Nat. Hist. N. Y.) 2b. Basal aspect of another specimen. (Coll. J. M. Clarke.) Dorwnocmorus mmanus Jel 5 5 6 6 5 6 5 0 0 8 6 oo gD BI 38. A somewhat flattened specimen. (Am. Mus. Nat. Hist.) ID OMARION IMMYNoNAtw IENBI) 5 5 5 5 5 6 6 0 6 0 Oo BMS da. The type specimen ; anterior view. (Museum Davenport Acad. Sci.) 4}. Another specimen, giving a posterior view of the calyx. (Same collection.) 4c. Another showing the dorsal view of calyx. (Coll. W. and Sp.) 4d. Ventral aspect of the same specimen. DOTATO CREWS eC OSD ACI vata U Se VV fue cI CUS) [een eS oC EESILLC 5a. Dorsal aspect of calyx. (Coll. V. W. Lyon.) 5b. Posterior view of the same specimen. 5c. Ventral aspect of same. 5d. Dorsal aspect of another specimen. (Coll. W. and Sp.) DOnAnoOCRINES MAGUS Iyom 6 > 6 6 6 9 5 9 0 6 o o 0 ol Sl 6a. The type specimen; anterior view. (Coll. Sidney 8. Lyon.) 6. Dorsal aspect of the same specimen. 6c. Ventral aspect of same. DoLATOCRINUS EXcAVATUS W. and Sp. ... .. =.=. .. . od 7. Inner floor of the ventral disk. (Coll. V. W. Lyon.) 8. Inner floor of basal disk. CRINOIDEA CAMERATA. La Chas.R. Keyes del. PLATE XXVI Heliotype Printing, Co. Boston. Fig. 1a. 10. 2a. 20. (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. BaTocrinvus IcosipActytus 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. BaATOCRINUS TURBINATUS (Hall). . .... . Posterior view of the calyx. . Lateral view of another specimen. . Antero-lateral view of a specimen with arms. BATOCRINUS TURBINATUS, Var. ELEGANS (Hall) Lateral view of the calyx. . Posterior view of the same. Bavocrinus CANTONENSIS Miller and Gurley . Posterior view of a specimen, showing anal tube. . The same view of a specimen with arms. BaTocrInus ctypeatus (Hall) . .. . . 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). Lateral view of a small specimen with arms (variety B. inornatus.) 368 369 376 383 380 XXVIL Et PLAT INGIDEA CAMERATA. e3 CR Heliotype Printing Go. Boston AM Westergren del. PLATE XXVIII. PAGE ORO BONO WOrcmOsmas Cee) . 5s s 6 6 6 6 5 0 oo yp YB Fig. la. Anterior view of a specimen with arms, anal tube, and column. (Mus. Comp. Zool.) 16. 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.) BYOCmEUA mais Cell) 5 5 5 5 5 56 6 6 o eo eo 0 oc co OIF 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 quasinuus Meek and Worthen ...... .. 872 4a. Side view of the calyx. (Same collection.) 46. Specimen showing the anal interradius. (Same collection.) BARONS za CMD. ¢ 6 6 o « o @ 0 6 6 6 6 oo BH 5. Posterior view of the calyx. (Same collection.) 6. Specimen with arms. (Mus. Comp. Zoél.) BATOCRINUS SUBMQUALIS (McChesney). ........ . 869 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 bifurcation of the right postero-lateral ray. (Same collection.) BATCCRINOS MERC TMATUS WY, gic Shs ¢ 2 5 6 ¢ o © o 56 OG 10a. Posterior view of the type specimen. (Coll. W. and Sp.) 10d. Another specimen, showing the left postero-lateral ray. (Same collection.) PLATE XXVIII CRINOIDEA CAMERATA. eee Heliotype Printing Co. Boston. AM.Westergren del. PLATE XXIX. DizyGocRINus DODECADACTYLUS (Meek and Worthen) . Fig. 1a. Lateral view of the calyx. 10. Ie. Op 2b. Posterior view of the same. Ventral aspect of same. DizyGocRINUS ANDREWSIANUS (McChesney) Posterior view of the calyx. Lateral view of another specimen. 2c. A specimen with arms, showing one of the postero-lateral rays. 2d. Posterior side of a specimen with arms. Dizycocrinus RoTuNDus (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. Ventral aspect of a more discoid specimen (type of Actinocrinus oblatus Hall.) BATOCRINUS LAURA (Hall) . 5a. Large specimen with arms. 6. i 8a. 8d. 9a 90. . Anterior view of the calyx. . Lateral view of another specimen. . Posterior view of a more conical specimen. Eurrocnocrinus Curisty1 (Shumard) ... . A young specimen (#). Evurrocuocrinus Lovet W. and Sp. ...... A young specimen (). LOBOCRINUS AQUIBRACHIATUS (McChesney). . . - Posterior side of the calyx. Lateral view of another specimen. LoBocRiInus HQUIBRACHIATUS var. ASTERIScUS (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.) PAGE 432 433 431 384° 409 412 440) 441 PLATE XXIX. Heliotype Printing Go. Boston. M.Westergren del. sy CRINOIDEA CAMERATA. A a z sis PLATE XXX. PAGE IBAmOCIEOR WACO Wo gl Side 5 0 56 5 0 5 0 0 6 o BIG Fig. 1. Specimen with arms, stem, and cirri. 2. Another specimen with arms and stem. 3. Ventral aspect of calyx (?). BAROCROTOS TmoaDMnOS IB 6 6 6 5 6 6 6 ooo ek tl ol OS 4a. Posterior view of the calyx. 4b. Lateral view of the same. 5. Specimen with arms from Bono, Ind., probably of this species. BARCCOUENOS ROCWHUN > Ao Mier. 5 2 5 6 6 oo op oe ol tl BS 6. Specimen with anal tube, arms, and stem. Lonocmanas Wiican (Simmer) . 5 . 6 6 6 6 ob oo og Bl Ta. The type specimen, showing anal side. 7b. Dorsal aspect of the same specimen. LOROCHINTGS BOBURUS Woeml Smo oc so 5 5 6 6 6 gw ow AE 8a. The type specimen; antero-lateral side. 8. Posterior side of the same. Lopocrinus Hacer (McChesney). .......... . 445 9. Posterior side of the calyx. 10. Antero-lateral side of another specimen. LozocRInus spinrirERUS W.and Sp. .......... . 439 11. One of the type specimens, showing the anterior side. 12. Another type specimen, showing the posterior side. Macrocrinus sucunpus (S. A. Miller) . . . ..... =. . 451 13. Calyx and anal tube; anterior side. 14. Specimen with arms; antero-lateral side. MACROCRINUS VERNEUILIANUS (Shumard) . .....- . + ~- 450 15. Large specimen with arms and anal tube. 16. Another specimen; the tube somewhat inflated. 17. Posterior side of the calyx; the plates but little convex. 18. Anterior side of the calyx; a very large, nodose specimen. (All the specimens in the collection of Wachsmuth and Springer, except that of Fig. 7, which is in the Lyon collection.) PLATE RATA. NOIDEA CAMI I CR Heliotype Printing Co. Boston. J.L Ridgway, A.M. Westergren del. PLATE XXXII. PAGE IDOwoorIeHOS NeNenyaovivn (MMR) 6 5 9 6 5 oe 6 5 3 oo oo SE Fig. 1. Fine specimen with stem and anal tube. 2a. 20. 3a. 30. 3c. 3d. 3e. 4a. 4b. LoBocRINUS NASHVILLH var. SUBTRACTUS (White) . ... . . 486 Posterior side of a specimen with stem and anal tube. Portion of a deformed stem from another specimen. ILOWOQCMINE Lana (Mnimene)s 5 b 6 5 5 6 5 6 5 0 ol AB Anterior view of the typical form; part of stem and anal tube preserved. Posterior side of a varietal form. Anterior view of an elongate variety. Perfect specimen with stem, arms, and anal tube. Section of an arm (enlarged), showing the spinous processes along the sides of the free brachials. IBAROCROUS wien Wie emGl Wea 5 5 6 6 5 6 6 6 5 6 o HE Posterior view of the calyx. Anterior view of another specimen. (All the specimens in the collection of Wachsmuth and Springer.) XT. PLATE CRINOIDEA CAMERATA. — Heliotype Printing Oo. Boston. Chas R Keyes del. PLATE XXXII. PAGE wMHOO Ooms Campana (Samer) . 6 6 6 5 5 5 0 5 5 OY Fig. la. Lateral view of a specimen, showing arms, stem, and anal tube. 1d. A specimen preserving the extremity of the anal tube; viewed from above. 1c. Posterior view of the calyx. Bumpocmocmanas Iowa CW, el So) . 6 so 0 6 0 5 oo HAZ 2a. Lateral view of the type specimen. 2b. Anterior view of the calyx. Evrrocwocrinus CHRIsty1 var. TRocHiscus (M. and W.) . .. 410 3. Posterior view of the calyx. HUTROCHOOCRINUS PLANODISCUS (Hall)... ».-— ... . . 4ffl 4a. Ventral aspect of the calyx. 4b. Dorsal aspect of same; basals and first radials broken away. (All specimens in the collection of Wachsmuth and Springer.) PLATE XXXII. Heliotype Printing Co. Boston. ta we Le CRINGIDEA CAMERATA. Ghas.R. Keyes del PLATE XXXIII. PAGE DizYGOCRINUS ORIGINARIUS W. and Sp. ........ ~. 42! 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. Di1zYGOCRINUS MONTGOMERYENSIS (Worthen) ....... . 428 8. Specimen with arms, anal tube, and stem; from Crawfordsville, Ind. 4, Another specimen with arms (all paired but one) ; from Keokuk, Lowa. DizyGOcRINUS MONTGOMERYENSIS var. UNIBRACHIATUS W.and Sp. 429 5a. A somewhat abnormal specimen with arms and stem. (Coll. L. A. Cox.) 5b. Another specimen with arms. (Same collection.) 5c. Posterior view of another specimen. IDAVECOGRINWS ImpoAKTONEIS Ib, Al CO, 5 0 5 0 6 2 0 56 oo ol GENS 6a. Postero-lateral side of a specimen with arms. 6b. Calyx of another specimen, exposing anal side. DizIGOCRINUS INDIANENSIS var. SIMPLEX W. and Sp... .. . 415 7. Anterior view of a specimen with arms. DizyYGOCRINUS CANTONENSIS W. and Sp. ........ ~~. 428 8a. Specimen with portions of the arms, and showing anal tube. 8d. Another specimen, showing the arms and anal tube. DIZ.COGRINIUS BLUR BUNPACT US (lela!) ee emee nT neds Secu 1 9. Lateral view of the calyx. Drv Wiieatuoe Weel Soh 8 6 5 9 5 6 6 5 5 0 o Gl) 10a. Specimen with arms from the Keokuk group of Bono, Ind. 10d. Lateral view of the calyx. (Same locality.) 11. Posterior view of the calyx. (Specimen from the Warsaw limestone of Kentucky.) DizyGocrinus FAcETUS Miller and Gurley. ........ 418 12. Specimen from Canton, Ind., showing anal interradius. (All specimens in the collection of Wachsmuth and Springer, unless other- wise stated.) I. XXD PLAT! CRINOIDEA CAMERATA. Se Lb 2a on. 4 Heliotype Printing Co. Bos Chas.R Keyes. del. Se Cog a cae ae ? 3 = re PLATE XXXIV. CRINOIDEA CAMERATA. Heliotype Printing Co. Boston. J.L Ridgway, A.M Westergren del. PLATE XXXIV. ERETMOCRINUS CALYCULOIDES (Hall) Fig. 1a. 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. 3. Lateral view of the calyx, showing the excentric position of the anal tube. 4, Showing the curvature of the anal tube. ERETMOCRINUS GRANULIFERUS W. and Sp. 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. Noposus 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. ERETmMocRINUS PRaGRAVIS 8S. 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. GENNZOcRINUS EUCHARIS (Hall) . Sirti hy ns 14. Portion of the dorsal cup AcAcocriInus AMERICANUS W. and Sp. . . » 15a. Anterior side of the type specimen. 150. Posterior side of the same specimen. Acacocrtnus Exropi W. and Sp. 16. The type specimen. PAGE 395 390 396 405 548 549 515 AoROcRINUS ELEGANS (S. A. Miller) . . . Fig. 17a. Posterior side of the type specimen, — Ventral aspect of the same. ; Lozocrinus Inruatus (Rowley and Hare) . 180. Anterior view of the type specimen. 18. Lateral view of the Spagna described by Rowley and Hare as Batocrinus bulbosus. Dizycocrinus Goruryi (S. A. Miller) . . ae 19, The type sifee uae (All the specimens are in the collection of Wachsmuth and Springer, Soto those represented by Figs. 18a and 18d, which are in the possession of Mr. R. R. Rowley, and Fig. 19, which i is owned by Mr. F. A. Sampson.) _ PLATE XXXV, CRINOIDEA CAMERATA, mes teagan es Heliotype Printing Co. Boston. J.L.Ridgway del Macrocrinus Konincxr (Shumard) Fig. 1. Specimen with anal tube, arms, and stem. (Mus. Comp. Zodl.) 2. Calyx, showing anal side. 3. Another specimen, showing anterior side. Macrocrinus LAGuNncuxus (Hall) . 4. Calyx, postero-lateral side. DizyGOcRINUS 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. DizitGocRINvs DECORTS (Miller) 5 6 5» «© 0 © 9 A vo 6 9 BO 6. Calyx, in a side view. Dizycoorinus Euconus (Meek and Worthen) . Ta. Calyx, showing the postero-lateral ray, and the anal interradius. (A speci- men from Taylor Co., Ky.) 7d. Dorsal aspect of the same specimen. Dizycocrrnus muraBinis 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. Dizycocrinus Wurst var. pipActytus W. and Sp... .. . 12. Specimen with the arms all paired. 13. Specimen in which most of the arms are single. DIzyYGocRINUS ORIGINARIUS var. ADULTUS W. and Sp. . 14. Specimen with most of the arms paired. 15. Another in which most of the arms are single. 18. . Posterior side of a specimen with arms. PLATE XXXYV. DizyGOcRINUS UNIONENSIS (Worthen) . Anterior side of calyx. Anal side of a crushed specimen. Side view of another specimen. Another specimen, showing posterior side. Pacer 447 415 420 430 429 420 Dizyeocrmus UNIONENSIS- var. DIVALIS (S. AK: Miller). a Fig. Dit. Specimen with arms, showing anterior side; the arms alternately ene, 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. E (All specimens in the collection of \y erogrnan ae Springer, unless other : wise stated.) : PLATE XXXVI. PAGE ERETMOCRINUS REMIBRACHIATUS var. EXPANSUS W. and Sp.. . . 390 Fig. 1. Ventral aspect of a large specimen, showing the folding of the arms. The radial trunk of an Hucladocrinus millebrachiatus lying on top. DimM@ormyos CnI® (ERI), 5 ¢ 6 6 0 6 00 9 6 50 6 o 4 GOB 2a. Specimen with arms and column. 26. Posterior side of the calyx. ERETMOCRINUS NEGLECTUS (Meek and Worthen). ..... . 394 3. Anterior side of the calyx. Dimmmnogrmyrus Guo (sey 5 5 56 oo 0 6 6 6 6 0 0 eo SBE 4a. Specimen with arms and column. 4b. Side view of a somewhat crushed specimen. HmiMoOcmans Comsumns Call). 5 5 4 56 6 5 6 6 6 5 oo OY 5a. Ventral aspect of the calyx. 5b. Dorsal aspect of the same. 5e. Lateral view of another specimen. 6. Fine specimen with arms. Dimmers winecosw’ Cae). 5 6 6 6 5 6 6 60 oo og AMO Ta. Specimen with part of arms (basals and radials not preserved). 7b. Posterior side of the calyx. 7c. Dorsal aspect of the same. Macrocrinus GemMirormis (Hall). . ........ . =. 449 8. Posterior side of the calyx. EREermMocrinus RuGosus W. and Sp. 402 9a. Posterior side of the type specimen. 9b. Ventral aspect of the calyx. (Same specimen.) 9c. The base of the same specimen. IDieramiMoosOROS wmONON \NY ENGL Sys 4p 3 6 0 6 56 6 6 0 6 6 5 Rll 10a. Posterior side of the type specimen. 10. Antero-lateral side of another specimen. 392 ERETMOCRINUS DEPRESSUS W. and Sp. dia. 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.) TE, XXXVI, PLA’ CRINGIDEA CAMERATA. Pray) SITU I) Heliotype Printing Go, Boston. AM Westergren del. PLATE XXXVI. PAGE : ERETMOCRINUS REMIBRACHIATUS var. EXPANSUS W. and Sp.. . . 890 Fig. 1a. Specimen from the Burlington and Keokuk transition bed; dorsal aspect. 1b. Side view of the calyx; from same bed. HRETMOCRINUS REMIBRACHIATUS (Hall)... ..... .. . 388 2a. Lateral view of a specimen from the Upper Burlington Limestone. 2b. Another example from the same bed. ERETMOCRINUS MAGNIFICUS Lyon and Cass ....... . 886 3. A large specimen, with rows of angular nodes following the rays and their subdivisions. HRETMOCRINUS RAMULOSUS (Hall) .....-..... . . of 4a. Posterior side of a large calyx from Tennessee. 4b. Dorsal aspect of a highly ornamented specimen from Iowa. 5a. Arm fragment, probably belonging to this species (from Tennessee). 5b. Cross-section of it. 5c. Upper portion of another arm fragment from the same locality. 5d. The cross-section. imams weNmomA Cael) 2 os 5 5 5 56 6 56 6 5 0 oe 6 BYE 6a. Specimen with arms; the anal tube bent outward. 6b. Specimen showing the natural curving of the anal tube. 6c. A large calyx. Hii Comosnnos Csi) 5 5 56 6 5 5 6 5 5 oo 3 AMG Ta. Dorsal aspect of the calyx. 7b. Anterior side of same. 7c. Ventral aspect of another specimen. WiACACCmEES CAs (sell) 5 5 5 6 6 6 556 4 0 9 6 oo SS 8. Anterior side of the calyx. emcees Cum Cael), 2 s 2s 5 5 5 + 5 6 9 5 0 5 2 SEB 9a. Anterior side of the calyx. 9b. Ventral aspect of a more lobate specimen. (All specimens in the collection of Wachsmuth and Springer.) VII. x TE XX) Pr CRINOIDEA CAMERATA. Lb La A iil mm wr Helio’ type Printing Co, Boston. Chas. Keyes del. Fig. 1a. 1d. 2a. 20. Yo, 2d. 2e. 3a. 30. Cs 4a. 4h. de. 5a. 5D. 5e. 6a. 6D. 6c. Tu. 7b. 1@ Td. Te. 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. Postero-lateral side of same. AGARICOCRINUS PYRAMIDATUS (Hall) . Specimen with arms. Dorsal aspect of the calyx. Ventral aspect of the calyx. Posterior side of a young specimen. 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 . 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. (All figures from specimens in the collection of Wachsmuth and Springer.) PAGE 508 511 512 512 503 508 PLATE XXXVIIL. CRINOIDEA CAMERATA. suaeee Ae " usie rt 7 AGS ‘i ce } Heliotype Printing Co. Boston. A.M.Westergren del. ea aes 7 £53 ia oa p fugr ee yew PLATE XXXIX. PAGE AeNecOCmES Comvar (Il, emg ©) o s 5 0 5 6 56 0 6 6 6 Gi Fig. 1a. Basal view of the type specimen. (Lyon collection.) 1b. Side view of the same. ACUMTIOOOMENUS CHAOS WWEWNIEMDy, o 5 5 5 o a o 5 6 5 » 4h) 2a. Side view of a large specimen. (Coll. L. A. Cox.) 2b. Dorsal aspect of the same specimen. ACARMOOOBONUS mx yAmes Jal . 5 5 5 5 2 5 oo 3 oe 0 Ail 3. Side view of a specimen with greatly protruding anus. (Coll. W. and Sp.) 4, Dorsal aspect of another specimen. (Same collection.) 5. Dorsal aspect of another. (Same collection.) AGARICOCRINUS NODULOSUS, var. MacapAmsi Worthen .. . . 498 6. Side view of a large specimen. (Same collection.) ANEINRICOCIENGS COMMS Wo aml Sd. 2 2 2 5 6 5 6 oe gl MOL 7. A fine specimen with Myzostoma (?) cysts on two arms. 8. Posterior view of the calyx. (Both specimens in the coll. W. and Sp.) MEMuCocmerws, Worm Je 5 5 4 5 oe 5g oo ne AGL) 9. Dorsal aspect of a specimen in which the second costals are produced into large nodes. (Coll. L. A. Cox.) GRINOIDEA CAMERATA. ANT ss Ovne Daae La fa Lb AM Westergren del. Heliotype Printing Oo. Boston PLATE XL. PAGE AGARICOCRINUS SPLENDENS 8. A. Miller... ..... =. . 495 Fig. 1a. A large specimen with arms and stem. 1. Dorsal aspect of another specimen. 1c. Ventral aspect of the calyx. (?) AGARICOCRINUS NoDULOSUs Worthen. . . ...... . 497 2. Dorsal aspect of a very smooth specimen with portions of the arms, from Canton, Ind. AGARICOCRINUS ELEGANS Wetherby: .......... . 500 3a. Dorsal aspect of a specimen from Hamilton, Ill. 36. Ventral aspect of the same. AGNUICOCINUS CRASSUS Welnemby 2-2 s 5 5 5 5 5 5 5 5 4O9 4. Tegmen of a small specimen from Tennessee; the food grooves of the pos- terior rays covered by large alternate plates. ACMuCOCaMOS Women Ie, 5 5 5 5 5 6 o 5 5 5 ow 4G) 5a. Posterior side of a large specimen. 5b. Anterior side of the same. dc. 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.) GRINOIDEA CAMERATA. PLATE XI AM Westergren del Heliotype Printing Co, Boston. Fig. 1a. 10. le. 1d. 2a. 20. Le, 2d. 3a. . Posterior side of calyx. 5. PLATE XLI. AGARICOCRINUS INFLATUS Hall . 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 GRACILIS M. and W. A large specimen with arms. . Dorsal aspect of same. AGARICOCRINUS BELLATREMA Hall . . A specimen with portions of the arms. . Posterior side of the calyx with one arm attached. . Posterior side of a smaller specimen. d. Side view of a large specimen. AGARICOORINUS BELLATREMA, var. MAgoR W. and Sp. Ventral aspect of a very nodose specimen. (All specimens in the collection of Wachsmuth and Springer.) A large specimen with arms (the arms slightly restored.) Pace 502 . 493 513 506 507 iWwATEy Salve CRINOIDEA CAMERATA. 4a oe La 2a SS y NN diy Lb a —<——— gece seers : : ren Heliotype Printing Co. Boston. del. hh Keyes Chas PLATE XLV. AOROCRINUS RADIATUS W. and Sp. Fig. 1. A specimen with arms; anterior side. AOROCRINUS HELICE (Hall). 2. Posterior view of the type specimen. (After Hall.) AOROCRINUS PARVIBASIS W. and Sp. . 8a. Specimen with arms from the anterior side. 3b. Posterior view of the calyx. AoRocRINUS IMMATURUS W. and Sp. . 4a, Lateral view of specimen with part of the arms, and portions of stem and cirri preserved. i 4b. Posterior view of another specimen. AOROCRINUS HELICE (?).. 5. Anterior view; from a gutta-percha cast made in the natural mould. AOROCRINUS CANALICULATUS M. and W. . 6a. Anterior view of the type specimen. (After Meek and Worthen.) 6b. Posterior view of the same. (After Meek and Worthen.) AOROCRINUS SUBACULEATUS (Hall) . Ta. Anterior view of the calyx. > 7). Posterior side of the same. (After Hall.) Dorycrinus UNrIcoRNIS (O. and Sh.) . 8a. Anterior view of a specimen with arms. 8d. 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 PARVUS (Shumard) '. lia. Specimen with arms and stem. 11. Posterior side of calyx of a large specimen. PAGE 472 481 473 471 481 476 468 DorycRINUS UNISPINA (Hall). . .... . eS eee es ’ - Fig. 12. Specimen with an unusually large spine and portions of the arms. DoRYCRINUS MISSOURIENSIS (Shumard) 13a. Anterior view of the calyx with spines intact. 13d. Ventral aspect of the same specimen. : 18e; Posterior view of another specimen. 14, An abnormal specimen; posterior side. -Dorycrrnus Ramurt M.andW.. ... . poche eee 464: 15a. Anterior view of the calyx. 150. Posterior view of another specimen. aie: (All specimens, except 6 and 70, in the collection of Wachsmuth and Springer. ) a opus Maa PLATE XLVI. PAGE (Q) Wiinicroomanas Wreomr Cell) . , 2. 5 5 6 6 6 es 530 Fig. 1. A very large specimen from the Upper Burlington limestone. (Coll. W, and Sp.) z. A smaller specimen from the same bed. (Same collection.) 3. Side view of the calyx. (Same horizon, and same collection.) (?) PERIECHOCRINUS TENUIDIScUs (Hall) . ........ 581 4, Lateral view of the dorsal cup. (Same collection.) AGARICOCRINUS Sampsonz S. A. Miller. . . ... =... . 505 5. The type specimen. (Coll. F. A. Sampson.) Losocrinus #QUIBRACHIATUS McChesney . ....... . 440 6a. Specimen with only eighteen arms. (Coll. W. and Sp.) 6b. Ventral aspect of the same specimen. BATOCRINUS ROTADENTATUS Rowley and Hare. ...... . 374 7. The type specimen, showing the dorsal cup. (Coll. R. R. Rowley.) SAMOS Chaivaam Wyowleyy 4 . 5 2 6 1 0 6 6 6 56 0 5 BB 8a. Side view of the type specimen. (Coll. R. R. Rowley.) 8b. Another view of the calyx, showing the anal interradius to the left. DizYGOCRINUS EUCONUS, var. ABSCIssuS (Rowley and Hare) . . . 481 9. Side view of the calyx. (Coll. W. and Sp.) DizyGocrRINus MONTGOMERYENSIS Worthen. . ..... . . 428 10. Type of the synonym “ Batocrinus Gurleyi” R. and H. (Coll. R. R. Rowley.) BAYCTTENT(O CO FGINTU SI ( (7p) CEO) COFTEEY AUUUGETNUSIUSI Seg V 10111) Su 7) iia. Posterior view of the type specimen. (Coll. F. A. Sampson.) 116. Ventral aspect of the same specimen. PLATE XLVI Heliotype Printing Oo. Boston. TPT re Mipapprin' di fy Li Peer HE ons A ool gant R20, by P< COUT ergs oe - & CRINOIDEA CAMERATA. A.M Westergren. del. 8a. 8d. PLATE XLVI. PAGE Winensinocimaras Tiyan Oban Smo 6 5 6 56 5 uy 5 6 6 5 5 EBB . 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. . 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. NCCES OES WW eal So 5 6 5 0 5 5 5 6 ol oo Se 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.) irveme cl EVADE a CGRINOIDEA CAMBRATA. Co. Boston. 5 Heliotype Printin; AM Westergren del Rida Wk A r i Pay Te PLATE XLVIII. PAGE WibKHISAtOXoH oso) Savoie Ion . 5 2. 2 5» « 6 56 » « o o Coyle Fig. 1a. Posterior view of the type specimen; from Louisville. (Lyon collection.) 1b. Dorsal aspect of the same specimen. 1c. Ventral aspect of same. 2. A specimen from Columbus, O.; the form described by S. A. Miller as IM. pileatus. (Coll. W. and Sp.) Wieinocmerns mAmos Idle, + 6 5 6 +o >» 6 o 0 a 6 6 ol BBB 3a. Ventral aspect of calyx. (Coll. A. 8. Tiffany.) 30. Dorsal view of same. (The orientation of both figures incorrect.) Nena IMuESOmm Witte. o 5 o 6 6 5 6 o ol 5 RD 4a. Dorsal view of the calyx. (Coll. W. and Sp.) 4b. Side view of another specimen. (Same collection.) NOergmCIIENOS GoONOAiOS We gal So co 2 5 o 5 6 5 5 oo BAS 5a. Dorsal view of the calyx. (Coll. W. and Sp.) 5b. Lateral view of the type specimen. (Davenport Acad. Sci.) 5c. Ventral aspect of the same specimen. MEciIsTocRINUS RUGOSUS Lyonand Cass.. ........ . 542 6a. Dorsal aspect of the calyx. (Coll. W. and Sp.) 6b. Ventral aspect of the type specimen. (Lyon collection.) 6c. Anterior view of a smaller specimen, showing portion of the anal tube. (Same collection.) XLVI PLATE CGRINOIDEA CAMERATA, ‘Sc fes* Ss Heliotype Printing Co. Boston. Ghas.R.Keyes del. PLATE XLIX. PAGE NitencniociTeyOs Toms ION, 5 2 4 so 5 5 5 o 5 9 5 0 BAB Fig. 1a. Dorsal aspect of the calyx. (Coll. W. and Sp.) 1d. Lateral view of the same specimen. 1c. Ventral aspect of another specimen. (Same collection.) NiegnOGMTOS mms Ills 6 5 . 5 6 o 6 oo eo 5 tah 2. A specimen from New York. (Coll. A. 8. 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.) 4b. 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.) NiGsenSOCTONOS NOMOSUS IEE 6 2 6 5 6 0 0 9 0 9 5 3 ol Bf 5a. Lateral view of the type specimen. (Mus. Davenport Acad. Nat. Sci.) 5b. Ventral aspect of another specimen. (Same collection.) MEGISTOCRINUS MULTIDECORATUS Barris. ..... ... . . 542 6. Lateral aspect of the type specimen. (Same collection.) amie LID Pi Heliotype Printing Co. Boston, CGRINOIDEA CAMERATA. 3 n a = oO is fe g fas) PLATE L. PAGE PERIECHOCRINUS NECIS (Winch. and Marcy) ....... . 524 Fig. 1a. Posterior side of an internal cast. (Coll. W. C. Egan.) 1d. Ventral aspect of another cast. (Same collection.) Perrechocrinus irenix W.andM........... . 525 2a. An interior cast in a side view. (Same collection.) 2b. Ventral aspect of an internal cast. (Same collection.) 2c. Lateral view of a specimen figured by S. A. Miller as Saccocrinus Hgani. (Same collection.) 2d. Ventral aspect of another cast, figured as S. Lyani. (Same collection.) PERIECHOCRINUS ORNATUS Halland Whitf.. ....... . 527 3a. Gutta-percha cast from a mould in the rock, showing surface markings; posterior side. (After Hall and Whitfield.) ; 3b, Anterior view of an internal cast. (After Hall and Whitfield.) PERIECHOCRINUS) TENNESSEENSIS (Hall) 2-5 3 5. 392) =) 528 4, Posterior view of Roemer’s type specimen. (After Roemer.) PERIECHOCRINUS URNIFORMIS (8S. A. Miller) . ...... =. 526 5a. Posterior view of an internal cast. (Coll. W. C. Egan.) 5b. Ventral aspect of another cast. (Same collection.) lOO SecOsos CSeN)) . 5 5 6 6 0 0 5 56 o 3 ol 6a. The type specimen. (After Hall.) 6). Part of an arm enlarged. (After Hall.) PERIECHOCRINUS MARCOUANUS (Winch. and Marcy). ... . . 523 Ta. Side view of an internal cast; anal side to the left. (Coll. W. C. Egan.) 7b. Anterior view of the dorsal cup. (Same collection.) CRINOIDEA CAMERATA. : PonAiEel ta : Lb Po ina raya: Ke Ay Ghas.R. Keyes del. Heliotype Printing Co, Boston. PLATE LI. PAGE ep) Wisin CEN). 2 5 5 5 5 5 5 we 5 EY Fig.1. A very large and unique specimen with arms. Za. Side view of the dorsal cup. (After Hall.) 2b. The plates of one ray, showing ornamentation. (After Hall.) 3. Posterior view of a large elongate specimen. 4. Ventral aspect of another specimen. PERIECHOCRINUS MARCOUANUS (Winch. and Marcy). .... . 523 Side view of the dorsal cup. PERIECHOCRINUS TENUIDISCUS (Hall). 2 99205). 5) 4.) Sol 6. Antero-lateral view of the dorsal cup. Amacom Ormimos (sla) 5 5 5 5 5 5 5 a 5 5 0 ol BOF 7. Side view of the calyx; from St. Paul, Ind. MDETnROCRIUIOS sO We, aml So. 5 s 5 o 5 0 5 0 5 5 BOT 8. A young specimen. (Type of Megistocrinus parvus.) lpm oO muos \WWissauo Cell) 5 5 2 5 56 2 5 o 5 0 oe SRD) 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 8, in the collection of Wachsmuth and Springer.) LATE LI 55) ag iotype Printing Co, Boston. 4 He CAMERATA. CRINGID Chas. R Keyes del. ee — aeEeEeEeEeEOEOee—eEeEeEeEE——=— ———— —— — Fig. la. 2a. 2c. 4a. 4b. PLATE LIT. AGOGO won Jel 2. 4. 5 5 5 5 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. AOTINOCRINUS 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 GRIFFITHI 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 555 568 573 PLATE LII “fe i ast CSUs a wea Cisse rat ae Sn eed) aan aupatts: bs Aiea CRINOIDEA CAMERATA. Heliotype Printing Co, Boston. AM.Westergren del. TONTID) ToH00e, \ XN ACTINOCRINUS MULTIRAMosus W.and Sp. . .. . F7 aes iL magnificent specimen with arms and anal tube. ; ACTINOCRINUS MAGNIFICUS W.andSp. ......... 2. . so 1 0 os 0 6 oo oe BOR 5a. Specimen with arms. (Mus. Comp. Zodl.) 5b. Calyx, showing the left posterior ray and the anal interradius. (Coll. W. and Sp.) CACC NOS MipMEACsoUAMOS CERI) 5 , 5 0 6 6 5 0 0 6 GY 6. Antero-lateral view of the calyx. (Coll. W. and Sp.) 7. Posterior view of another specimen. (Same collection.) Cunomioxersincinn) sot, Cell) 6 6 6 5 6 eo 6 6 6 0 oo oe 5 COB Anterior view of a specimen with arms. (Mus. Comp. Zoél.) 9. Posterior side of the calyx; from near Louisiana, Mo., described by Rowley and Hare as Actinocrinus puteatus. (Coll. R. R. Rowley.) Cacrocrinus Ectypus (Meek and Worthen). . ...... . 611 10. Side view of a large specimen. (Coll. W. and Sp.) bo ACMROCWUETUS GiGi Wo aol So, so 2. co o 5 6 5 0 0 oe ol 11. A specimen with arms (4!). (Mus. Comp. Zodl.) PLATE LVI GRINOIDEA CAMERATA. ae # heli gaat RECON “(jaune iusalitaiti dei TTT ae \ idHLAUiAN AARAAAUU UG dag id ada Ai Heliotype Printing Co, Boston. RR non thene iii eee choawannseaetea: rio illus diay: SNe UTE Hb LAY i sig . a une 4 arn dese, +3 SSS ae Gi, i. l tae haan Re desta Nobel tT ‘ay ls i AM Westergren del. Fig. disk. PLATE LVI. PAGE CACTOCRINUS NODOBRACHIATUS W.andSp.. ....... . 622 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. COUNcinfoyersaxnok) (Ouneinisisraiiars) WAG Gul phe 2 5 5 2 5 0 o 6 o (yal 3. Posterior view of the type specimen. : OACTO CRIN TS) AURN OLD Le AV\eneyTI CLES (yet e nein nest trent n-ne mE 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. CACTOCRIN US) DEN TOUR AUS VV aN CIS |0 smn inne incite nerOUC 5a. The type specimen, showing the right posterior ray. 5b. Portion of an arm from near the upper end (enlarged). QNCMOMIITUS MNS Wo Gal SO, . o 5 s 6 o oc a 9 5 59 GG Lateral view of the calyx. 7. Specimen with arms, anal tube, and column. Cactocrinus Loneus (Meek and Worthen). . ...... . 609 8. Anterior view of an unusually fine and large calyx. CACrOGRINUS 5 og eo 5 OM 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 — oe LVI ay PLAT CRINOIDEA CAMERATA. anintietistass nits santas 5 ul AMeAH MAN ECEHEAECLETC GiGi igual = =s ETE aac diedd SRQANCARERN AAWUANAAR EAA (TLE TTT?) 4 P PRICE TEL ff : et Ce OTT WE CUTTS TMA TCC roret| HEESRES ONE mre me HM \ iN auaonensdsisii sauna Zip aap yy ys) \ tiled eatceages ps N SMUT biti gen Baad dehotype Printing Go, Boston. AM Westergren del. PLATE LVIII. : CAcnocrnss cui Cell), 2. 5 6 5 oo 5 6 6 6 5 oo GY Fig. 1. Showing the arm structure, and the arrangement of the hooks along the pinnules. ONgrocnngos canoes (sell) 5 5s 5 5 a 5 0 6 4 6 oo HOE 2a. Anterior view of the calyx. 2b. Posterior view of the calyx. CACiocmoES RROTSCDATS (eel) . . 5 5 5 5 s 5 6 o o OM 3. £9) 1 8a. 8b. @), 10. PLATE LXIV. PAGE PHYSETOCRINUS VENTRICOSUS (Hall) ..... . 0 o a 888 Specimen with arms, stem, and root. Lateral view of the calyx. Anterior view of the calyx. Posterior view of a small elongate specimen. Dorsal aspect of a depressed specimen of Hall’s variety “ Actinocrinus” reti- culatus. Anterior view of the calyx. Anterior view of a specimen of the type of McChesney’s “ Actinocrinus ” subventricosus. Specimen from the Lower Burlington limestone. Ventral aspect of the same specimen. IPEOMOOI MATOS Dia ARNMOS IW, mmcl WY 5 0 6 5 6 0 0 4 0 ol MS The type specimen. (After Meek and Worthen.) Dorsal aspect of another specimen. (All specimens, except Fig. 9, in the collection of Wachsmuth and Springer.) XIV. PLATE lL CRINOIDEA CAMBRATA. Se a ie ase me nate ‘ (Soe aly Oe «TY iste series ae any HttTs Hdl aan a N Walt Wl fi ili Heliotype Printing Co, Boston. Chas. Keyes del. Fig. 1a. 1d. le. 1d. Op 20. PLATE LXV. PAGE Smaonocmmnos wise (ale) 6 6 6 56 2 6 9 6 6 eo oo ol OBE 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 cup broken away, exposing the subtegminal galleries at the inner floor of the tegmen, and the grooves passing out from the centre and diverging to the arms. Specimen showing the outer face of the tegmen. SmRCnOCs Cura Cel) . 5 5 6 5 6 6 6 9 oe oo oe GMO Dorsal aspect of a medium sized specimen. Tegmen of another specimen. (All specimens in the collection of Wachsmuth and Springer.) GRINOIDEA CAMERATA, PLATE LXV. Ghas. RKeyes del. Heliowpe Printing Go, Boston. PLATE LXVI. 4 PAGE JAH Niwaeioshok) isomrosameCoOS) INE ehal Wo 5 56 6 6 6 6 5 oo 5 OR Fig. 1a. Specimen showing arms and stem. 1b. Dorsal aspect of another specimen with arms spreading, and a Platyceras infundibulum covering anal opening. : 1c. Lateral view of the calyx; also a Platyceras infundibulum attached. id. Ventral aspect of another specimen. lai umrgorrannof) oansracnonnosjos) ISBNS 575 5 4 4 56 o « 5 0 oF (oy! 2a. Lateral view of the dorsal cup; a very large specimen. 2b. Base of the same specimen. THT yamnMaCOSTS Wim) 5 o 6 6 6 5 6 56 0 0 5 og AOS 3a. Lateral view of the dorsal cup. 36. Dorsal aspect of the same. IPAS iInnAmoy el 5 5 6 6 6 oo 5 6 of 6 6 og HIG 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. 5b. Side view of a somewhat depressed specimen. lcm Wann Oem, 5 5 5 s 6 6 6 5 po o MOB 6a. Dorsal aspect of a specimen with arms. 6b. Posterior view of calyx. 6c. Ventral aspect of the same specimen. lBwMGhmasnOs) CimesnA WYO AINLISO c 5 5s 5 o 5 5 5 5 oo 5 OR 7. The type specimen with arms. PLATYCRINUS ORNIGRANULUS McChesney ......... TOL 8. A specimen with arms. ISD MCiinos MoMsaooOses Jel, 2 56 6 5 oo o 6 6 o o 0 Hh 9a. Dorsal aspect of a perfect specimen with arms. (Mus. Comp. Zodl.) 9. Ventral aspect of the calyx. Ainomares misCOmns Oa SI . 5 6 6 5 o 6 5 6 Ho IB 10a. Dorsal aspect of a specimen with arms, the outer parts of the latter slightly restored in two rays. 10, Ventral aspect of the calyx. 10c. Posterior side of the same specimen. (All specimens, except Fig. 9a, in the collection of Wachsmuth and Springer.) PLATE LXVI. CRINOIDEA CAMERATA ae oa Heliotype Printing Co, Boston, Chas.R. Keyes del. A ocd PLATE LXVII. PAGE Piao SAaOwor IRI, 5 ¢ 6 6 4 6 5 0 5 9 op 6 0 GMM Hig. 1. A fine specimen with arms and column, from Indian Creek, Ind. (Coll. W. and Sp.) 2. Side view of the calyx. (Same collection.) 3. Dorsal cup of a specimen from Burlington. (Same collection.) Irn Amores Ciara WE gaol Woo 6 o 6 5 0 5 56 o oo ol GOB 4, Specimen with arms and column. (Coll. W. and Sp.) 5. Dorsal cup of a large, elongate specimen. (Same collection.) IAT ASE VC RTINTULS LEN] © O MUTE Sa VVPLOTIt 2 aro (5 6. A young specimen with arms, showing the numerous bifureations of the rays, and a faint rugose ornamentation. PLATYCRINUS SPINIFER, var. ELONGATUS W.andSp.. ... . . 709 7. Lateral view of the calyx, showing portions of the arms. (Same collection.) enMoramaios CAyaus IL ¢ 5 6 9 6 0 0 0 ob 0 oo oe oo GS 8a and 6. Dorsal cup of two specimens. (Same collection.) Irn orcrares Women Jal 5 . 6 ¢ 5 6 5 6 6» 6 5 o 0 HOP 9. The type specimen. (Illinois State collection.) IEW AGdonnionus) Camino) Wo GELS}; 5 5 4 6 0 6 6 0 o o GO 10. The type specimen. (Mus. Comp. Zoél.) LHARKORUTOS, WHAM IL 6 5 5 6 o «0 6 5 oo a ol ORG lia. Side view of the calyx, showing the bases of the arms (enlarged). 110. Side view of another specimen. l PUATE To CRINOIDEA CAMERATA peti nts \ OM) SMe Mi \ RgseeoB ee irs, = v, er ye wh “oearance ie t= : Ee are: ss eee Yaa Oy Heliotype Printing Co, Boston. AM.Westergren del. Raed Kaan ore tom PLATE LXVIUI CRINOIDEA CAMERATA. Sy Hai hha w ent TTT) 8; ELE 1 Se NSS ta eect ti jadinie scetidiay 0, Boston, 8) Heliotype Printing Fig. la. 10. ile. 1d. 2a. 20. 3a. 30. oe. 4a. 4b. or 60. Ta. 7D. PLATE LXVIII. IPTATYCRINUS VERRUCOSUS Whites. ... .. .~. « The type specimen. (Mus. Comp. Zool.) 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 . 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.) PLATYCRINUS YANDELLI O. and Sh. 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 . Lateral view of a specimen with arms. (Mus. Comp. Zodl.) Dorsal aspect of the same specimen (the stem removed). PLATYCRINUS scuLPTUS Hall . Specimen from New Mexico, lateral view of the calyx. (Coll. W. and Sp.) PLATYCRINUS PARVINODUS Hall . . Side view of the type, the specimen somewhat flattened. (Mus. Comp. Zool.) Anterior view of another specimen less distorted. (Coll. W. and Sp.) PLATYCRINUS PECULIARIS W. and Sp. . 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.) 708 691 696 700 697 PLATYCRINUS ASPER M.and W.. . .. . . Fig. 9a. The type specimen. (Mus. Comp. Zodl.) 9b. Basal view of another specimen. (Mus. Comp. Zodl.) 10a. 106. 10. 11a. 110. 12a. 120. 13a. 130. NGO, 14a. 140. 15. PLATYCRINUS ORNIGRANULUS McCh. A fine specimen with arms, representing the typical form. Zool.) Dorsal aspect of a very short calyx; showing the ornamentation. W. and Sp.) A costal and two pairs of distichals. A specimen with coarser ornamentation. (Same collection.) (Same collection.) A specimen with a somewhat different ornamentation. A young specimen. (Coll. W. and Sp.) A still smaller specimen (?). (Same collection.) PLATYCRINUS EMINULUS Hall. Anterior view of calyx. (Mus. Comp. Zodl.) Posterior view of another specimen. (Same collection.) Ventral aspect of the calyx. (Coll. W. and Sp.) PLATYcRINUS scopiInA M. and W. . The type specimen. (Mus. Comp. Zoél.) Dorsal aspect of the calyx. (Coll. W. and Sp.) PLatycrinus Gorsyi 8. A. Miller . Dorsal aspect of the calyx. (Mus. Comp. Zodl.) PAGE 690 TOL 712 695 Fig. 1a. PLATE LXIX. PAGE PEATYCRINUS) SYMMHTRICUS \VWWivald as) 5) ee ees nen mODD Specimen with arms and column. 1b. Ventral aspect of the calyx; a large specimen. 1c. Ventral aspect of a young specimen; the orals almost symmetrical. PLATYcRINUS PLANUS O. and Sh. 668 2a. A large specimen with arms. 2b. Lateral view of the dorsal cup. 2c. A portion of the arms enlarged. 2d. A young specimen, apparently of this species. PLATYORINUS BURLINGTONENSIS O. and Sh. . 653 3a. A medium sized specimen with arms. (After Meek and Worthen.) 8). Lateral view of a large calyx. 8c. Ventral aspect of another large specimen, showing the anal tube. 3d. Posterior view of a smaller specimen. 3e. Ventral aspect of another small specimen. 3f. Dorsal cup of a young specimen. (Inadvertently drawn with left antero- lateral interradius at the top.) 3g. A very young specimen with zigzag arms, composed of single joints. 8h. Portion of an arm showing the lateral processes (enlarged). 387i. Portion of an arm in a dorsal aspect (enlarged). Pratyorinus AGAssizi W. and Sp. 669 4, A very large specimen with arms. PLATYCRINUS PILEIFORMIS Hall . 656 5. A specimen with arms (slightly restored). PLATYCRINUS BON@NsIs White . 683 6. A specimen having six arms to the ray. Mo MBMemonOS SM TEM 5 5 9 » 6 o 6 8 6 0 8 6 677 7. The type specimen. (After Hall.) Somewhat flattened. (All specimens in the collection of Wachsmuth and Springer, except that of 82, which is in the Museum of Comparative Zodlogy, and Fig. 7, which is in the Illinois State Museum.) PHATE XIX; CRINOIDEA CAMERATA. ISS Weel nee er IE ADU AP DY. Mdedie Mab Tite t |VALZ pvaUCOROReneasane ea ee Heliotype Printing Co, Boston. Ghas.R Keyes del. PEATE axe PAGE in unnomomos Sum lell S55 6 5 0 6 6 6 6 5 °0 5 6 6 a ONT Fig. 1. Specimen with faintly ornamented plates. PLATYCRINUS NODO-STRIATUS Wa and Spy. 9. 5 4. 4) ee 698 3. Specimen with six to the ray, the most frequent number. y 4a, Lateral view of the calyx; an older specimen. 4). Anal side of the same specimen. 4c. Ventral aspect of same. LiMcius TunoOmoes Ill, 5 . 2 5 5s oo oe ee 5 BRE 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. 'PLATvcrINUS TENUIBRACHIATUS Meck and Worth. . . . . 5 0 (OSM 7. A specimen with arms. 8. Another specimen, slightly differing in ornamentation. PLATYCRINUS) SUBSPINUDOSUSEEtally 4a) sen eae GS 9. A highly ornamented calyx. PEATYCRINUS) SAMPSONT Se Ale Mil ers shee eileen EGI IO 10. Lateral view of the calyx. lem omoros Jenin WYO 5 5 5 5 6 o o 4 5 s 6 el GM 11. A specimen with arms. "12. The basal disk. IPD NiMOIEOS winston IL. 5 5 5 5 a ek oo 5 lo «BRR 13a, Lateral view of the calyx. < 13). Posterior side of the calyx. PLAY ORIEN US, DAS yilic Tes Vien ct CE) aan 14, Lateral view of the type specimen. (All the specimens in the collection of Wachsmuth and Springer.) PLATE LXX. CRINOIDEA CAMERATA. Coa ae oars pte a, Zs Heliotype Printing Go, Boston J.L Ridgway del PLATE LXXI CRINOIDEA CAMERATTA. cA ~ Heliotype Printing Co, Boston Chas. K.Keyes J.L.Ridgway del . PLATE LXXI. PAGE HAVIOR INUSMUNC OMETUSm\\AMtCne me eee 5 2 4 2 664), Fig. 1. A very large specimen, showing the numerous ramifications of the arms. (Coll. W. and Sp.) 2, A small specimen, showing the same. (Same collection.) 3. The type specimen. (Mus. Comp. Zodl.) Piarrormus anyon Jae 5 5 6 5 4 56 a 6 6 gS cum are! 4a. A very large specimen with arms. (Same collection.) 4b. Portion of an arm (enlarged). 5. The calyx, showing the radial facets and the small first costal. (Coll. W. and Sp.) . EP AvORiNnis HODENSIssallvand=Wihttiy 292 2 6. ©. — « 666 6. The type specimen. (After Hall and Whitfield.) PLATO CiaAmenGas lslell gael Wim 5 5 6 6 6 6 o 8 9 OM 7. The type specimen. (After Hall and Whitfield.) UAMORENUSROONTRITUSMmEalleancdaWiith es 4 5 4 4 6. | = GOT 8. The type specimen. (After Hall and Whitfield.) PLATYCRINUS NIoTENSIS Meek and Worthen . ...... . 682 9. Specimen with arms (from Indiana). PLaAnivormnas long A While, 5 5 6 6 6 5 6 6 6 0 5 aes) 10. The type specimen. (Coll. F. A. Sampson, Sedalia). PLATYCRINUS CORBULIFORMIS Rowley and Hare . ..... . 657 1ia. Dorsal cup in a side view. 11d. Dorsal aspect of the same specimen. (Coll. R. R. Rowley.) PLATVORETUS ZQUIMDIRUS SbA While 5 6 6 s o 0 6 o 6 6 (O59 12. The type specimen. (Coll. F. A. Sampson.) PLaTyCRINUS Pisum Rowley and Hare ......... . 660 13a. The type specimen; posterior view. (Coll. R. R. Rowley.) 13d. Dorsal aspect of same. rat as eed PLATYCRINUS QUINQUENODUS White .......- Fig. 14a. The type specimen ; lateral view of calyx. (Mus. Comp. Zoil.) 14d. Ventralaspect of same. a 14c. Dorsal aspect of same. i PLATYCRINUS INSOLENS Rowley and Hare .. . 15. The type specimen, (Coll. R. R. Rowley.) PLATYCRINUS PECULIARIS W andSp. ... . 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 . . . . 18a. Dorsal aspect of the calyx. (Coll. W. and Sp.) 18d. Side view of the dorsal cup. PLATE LXXII. — PAGE EET AUD: RGN US EES GANTT. Ss 1c) ee a) Fig. 1. Specimen with arms, stem, and root. he 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.) HuCLADOCRINUS TUBEROSUS (Hall). == 25 2.9) 3 728 3. Specimen, showing the small branching arms given off from the tubular appendages. (Coll. W. and Sp.) 4a. Posterior side of the calyx. (Same collection.) 4b. Dorsal aspect of the same specimen. 4c. Ventral aspect of same. EUCLADOCRINUS MONTANENSIS Meek... ...2.2.~.~.~. 7293 5. The type specimen. (National Museum at Washington.) ley Nason IsUunie Sinwmmepel 5 5 5 5 0 5 oo 5 kl ks AY 6a. Specimen with arms and stem. (Coll. W. and Sp.) 66. Portion of an arm, enlarged. 7a. Posterior side of the calyx. (Same collection.) 7b. Ventral aspect of the same specimen. PLATYCRINUS BoonvitEBNSIs S.A. Miller. . . . . ites Scumess LOSI: 8a. The type specimen, showing the dorsal cup. (After Miller.) 8d. Dorsal aspect of the base. (Coll. W. and Sp.) 9. Another specimen. (Coll. F. A. Sampson.) lea Mundey poston) Ciawadeamwucnonnos) WECM 4 5 2 5 «0 2 0 > o o o Ml 10. Basal disk, showing the ornamentation. MARsUPIOCRINUS PREMATURUS (Hall and Whitf.). . ... . . 734 11a. Side view of the type specimen. 11d. Dorsal aspect of the same. (After Hall and Whitfield.) wep AemSpnr Tp sedoyu'seug “wojsog:“09 Sunug edouarr = i ij 7 , d Mii Uf} yj df Hilf! Le he SY or. a ey | f | a ait anil — nee Ua ACIONTa) WO Viv ad IXXT Sivig PLATE LXXIII. PacE EUCLADOCRINUS MILLEBRACHIATUS W.andSp. ...... . 720 Fig. 1. A large specimen; the tubular appendages hanging over the calyx. KUCLADOCRINUS MILLEBRACHIATUS, var. IMMATURUS W.and Sp.. . 722 i) Dorsal view of a small specimen; the tubular appendages directed horizontally. 8. Ventral aspect of a larger specimen, showing the bases of the arms. EUCLADOCRINUS PLEUROVIMINEUS (White) . ....... . 724 4. A large specimen, showing the dorsal side of the calyx. EUCLADOCRINUS PRANUNTIUS Wand Sp) 2 22. 2. se Ze 5. One of the type specimens, showing calyx and portions of the arms. PLATYCRINUS HUNTSVILL@& (Troost) W.andSp. . .... . . 678 6. 6 6 56 5 6 6 5 boo) lee 10. A mature specimen with arms; the latter biserial from above the last bifur- cation. (Coll. W. and Sp.) 11. A young specimen; the arms uniserial and zigzag, the joints elongate, and the pinnules far apart. (Same collection.) 12. Dorsal aspect of the calyx. (Same collection.) 13a. Side view of the calyx of a large specimen. (Same collection.) : 136. Anal side of the same specimen. 13¢c. Ventral aspect of the same. 14. Natural cast, probably of Cunicocrinus . .. . 735 From the Niagara group of Iowa. (Same collection.) e , , 7 | ae ee ia ; “> (@occocrinus Paco H, Roster op. ye eats eet oe See eer es) ‘4 ; ‘ Fig. 15a. Dorsal aspect of the calyx (drawn with the anal interradius at the lower left side). aa . 15. Right anterior side of the same specimen. 15c. Posterior side of same. (Same collection.) MARSUPIOCRINUS TENNESSEENSIS (F. Roemer) . . .... . . T8l 16a. Dorsal view of the calyx. (Coll. W. and Sp.) 16d. Ventral aspect of the same specimen, = : iy ; \ MARSUPIOORINUS STEIATUS Woandisp) cre oe elit eeu : 17. Dorsal view of a rather small specimen. (Same collection.) ¥ 18. Ventral aspect of another specimen. se Sonya 2 MARSUPIOCRINUS TENTACULATUS (Hall) . ...... Re TS 19a. The type specimen. (After Hall.) 19d. Enlargement of one of its rays. (After Hall.) . . . ' ° . . . CorpyLocrinus pLumosus (Hall) . .. . . UGE ace, . Fe ee 20. The type specimen. (After Hall.) PLATE LXXVL CRINOIDEA CAMERATA. tpt men oe Ys ees ily iS 7 NANOE x NS AN Helictype Printing Co, Boston, AM Westergren del Fig. 1a. 10. ie, 2a. 20. 10. PLATE LXXVI. ~ ARTHRACANTHA ITHACENSIS Williams . Lateral view of a specimen with arms. (Museum Cornell University.) Basal disk. The movable spines upon the tegmen. ARTHRACANTHA PUNCTOBRACHIATA Williams Specimen showing spine bases. (Coll. W. and Sp.) Another specimen with some spines attached. (Coll. Prof. 8. Calvin.) ARTHRACANTHA DEPRESSA W. and Sp. . . Dorsal aspect of the type specimen. (Coll. W. and Sp.) . Ventral aspect of the same specimen. DicHocRINUS LINEATUS Meek and Worthen . . The type specimen; posterior view of the calyx. (Mus. Comp. Zoél.) . Anterior view of the same specimen. . Dorsal aspect of same. DicHocrinus pisum Meek and Worthen . Specimen with arms. (Mus. Comp. Zodl.) DICHOCRINUS CRASSITESTUS White . . The type specimen; the anterior side exposed. (Same collection.) . Another specimen with part of the column attached. (Coll. W. and Sp.) . Posterior view of the calyx and anal tube. (Same collection.) DicHocRInus ovatus Owen and Shumard A fine specimen with arms. (Mus. Comp. Zodl.) DicHocrinus Liratus Hall Specimen with arms and part of column. (Same collection.) DicHocrinus coxanus Worthen . The type specimen. (Coll. L. A. Cox.) DicHocRINUS HAMILTONENSIS Worthen The type specimen. (Same collection.) PAGE 749 750 761 769 760 763 Demonia Acmgmus Wi 6 6 6 5 6 50 5 6 50 5 co o ol TOS Fig. 11. Posterior view of a specimen with arms. (Coll. W. and Sp.) DicinOCMEOS Hommage Wo eingl Sj o o © 6 0 6 6 6 o 5 0 WG 12. Side view of the type specimen. (Same collection.) CHAnmenOcrmas Ciamminmm WY gal So 6 6 o o 6 56 6 2 0 on oo WS 13a. The type specimen, showing the curved cirrus-bearing stem; from the Kaskaskia group of Kentucky. (Coll. W. and Sp.) 13d. Another specimen from the Kaskaskia group. (Same collection.) 18c. A specimen from the St. Louis group of Huntsville, Ala. (Same collection.) CRINOIDEA CAMERATA. Heliotype Printing Oo, Boston. 5 i 7 way de ag dg shas.R. Keyes J.L.Ri e 1@2. 10. 2a. 2b. PA, 3a. 30. 4a. 4b. 4c. 5a. 5d. PLATE LXXVII. DicHocRInus PoLyDAcTYLUS Cass, and Lyon A large specimen with arms. Posterior view of calyx, showing the elevated dome and disk ambulacra. DicHocrInus LAcHRYMosus Hall Specimen with arms and stem. Posterior view of calyx. Ventral aspect of same. Dicwocrinus tirAtus Hall Specimen showing the arms and stem. Posterior view of the dorsal cup. Dicnocrinus cryotus Miller and Gurley . Posterior view of specimen with arms. Ventral aspect of the calyx. Distal face of first distichal (¢). DicHocRinus pLicatus Hall . A small specimen with arms and stem. Another specimen, giving a side view of the dorsal cup. DicHocrinus orNATUS W. and Sp. . . Specimen with arms and stem, from near Mt. Pleasant, Iowa. DicHocRINus tavis Hall . Specimen with arms. (Coll. Mr. Fultz of Burlington.) . Another specimen. (Same collection.) . Portion of an arm with pinnules (enlarged). DicHocRInus ovatus O. and Sh.. . A specimen with arms. 8d. Posterior view of the dorsal cup. Dicnocrinus opLoneus W. and Sp. 9. Posterior view of the type specimen. Tot xX a &S 759 DicHocrinus Pisum M. and W. . Fig. 10. Posterior side of the dorsal cup. (After Meek and Worthen.) DicHocrinus stRIATUS O. and Sh. . 11a. Posterior side of the dorsal cup. 11d. Side view of another specimen. DicHocrinus InorNAtTUS W. and Sp. 12a. Posterior view of a specimen with arms. 12d. Another specimen. DicHocrInus DELICATUS W. and Sp. 13. The type specimen. (All the specimens, except 7a, 6 and 10, are in the collection of and Springer.) Pace 766 Wachsmuth PLATE LX XVII CRINOIDEA CAMERATA. La ae j faa oa Se eee ey Ohi dd LZ sam Heliotype Printing Co, Boston. Chas.R. Keyes del. PLATE LXXVIII. PAGE TALAROCRINUS SEXLOBATUS (Shumard) ........ ... 4 Fig. la. Posterior view of a specimen from Flagpont, Va. (47). (Coll. W. and Sp.) 1b. Ventral aspect of the same specimen (+). ie. Dorsal view of the calyx. (Coll. W. and Sp.) TTATAROCRINUS OAwas WORN, 5 > 5 6 5 6 6 ote o oe ite 2a. Posterior view of the type specimen (7°). (Ilinois St. Coll.) 2b. Ventral aspect of the same specimen (7). TLALAROCRIRTWS ImIAcORNIS Wo gal Sos Go 6 6 6 o » o 6 6 6 6 fee 3a. Posterior view of the type specimen (4°). (Coll. W. and Sp.) 3b. Ventral aspect of the same (1?). 3c. Specimen with arms (47). (Same collection.) TALAROCRINUS SYMMETRICUS (Cass.and Lyon). . .... . . 786 4a. Posterior view of the calyx (3°). (Coll. W. and Sp.) 4}. Ventral aspect of the same specimen (4). 5. Posterior view of type @). (Coll. 8. 8. Lyon.) TALAROCRINUS CORNIGERUS (Shumard) ....... =... %83 9a. 90. 10. . Posterior view of a specimen from Pulaski Co., Ky. (Coll. W. and Sp.) ». Ventral aspect of the same specimen (4°). . Anterior view of the type specimen, from Alabama (5). (Mus. Washington University, St. Louis.) . Ventral aspect of the same (%?). TALAROCRINUS SIMPLEX (Simard) s . ¢ 6 e@ » 6 o » o ao (i . Anterior view of the dorsal cup (2). (Coll. W. and Sp.) . Dorsal aspect of a larger specimen. (Same collection.) TALAROCRINUS sp. (?) Posterior view of a specimen from Pulaski Co., Ky. (8). Perhaps an ab- normal specimen of 7. sexlobatus. (Coll. W. and Sp.) Oral plates of the same (4). EMAC RINUSSOCOIDENDATIS) WiaUdiSpeen 2. 2 . . . . . W4o Anterior view of the type specimen. (Mus. Davenport Acad. Nat. Sci.) DicHocRINUS PENTALOBUS (Cass. and yon). . ... .... 15 Vig. 11a. Lateral view of the type specimen; somewhat crushed. (Coll. 8. S. Lyon.) 110. The fixed brachials, enlarged (¢). 1ic. An imperfect specimen, showing parts of the pendant arms. (Coll. S.S. Lyon.) Ishop-eNormasnan) Ila (lym) 6 0 5 o 5 o 5 6 6 0 ogo tl lo TG 12a. Anterior view of type; the lower brachials and a few joints of the stem restored from another specimen. (Coll. 8. 8. Lyon.) 12. Basal cup of same specimen. Dereon Kemmis IEW 5 5 5 5 5 fc ow og ol lo oo ABI 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.) IDNoEKOCrMaMMES TAINED Wo GML So 6 6 so « 5 0 0 6 0 5 TE 15. Specimen with pendent arms from the Upper Burlington limestone. (Coll. W. and Sp.). DIGHOCRINUS FHC USM Cas Sere. Clas leny; OT ete ee a 77 16a. Posterior view of the calyx. (Coll. W. and Sp.) 16). Side view of another specimen. (Same collection.) oe XX ap dl, PLATE CRINOIDEA CAMERATA. Heliotype Printing Co, Boston. A.M. Westergren. del. Fig. 1a. 1d. 2a. 2b. 2c 2d. 2e. 3a. 30. oe. 3d. 3e. PLATE LXXIX. PAGE TALAROCRINUS SUBGLOBosUS W.and Sp. ......... 789 Posterior view of the calyx. (Coll. W. and Sp.) Ventral aspect of the same specimen. PTEROTOCRINUS DEPRESSUS Luyon and Cass... ...... . %96 Lateral view of the type specimen. (Coll. S. 8. Lyon.) Lateral view of the calyx, showing two of the wings. (Coll. W. and Sp.) Dorsal aspect of the calyx. (Same collection.) Another type specimen, showing the wings in position. (Coll. 8. S. Lyon.) A wing, showing the face of attachment. PRROROCRINUS ACTNUS VWWelIeWy « 5 5 So 5 5 5 6 6 oa) ey) Posterior view of the calyx. (Coll. W. and Sp.) Anterior view of the same specimen. Ventral aspect of a specimen with two of the wings preserved, and the anus covered by a Gasteropod. (Same collection.) Another specimen, showing the wings in a side view. (Same collection.) Dorsal aspect of a fine specimen with arms and wings. (Same collection.) 3fand g. 2 wings of a different species. (Same collection.) 4a. . Dorsal aspect of the same specimen. 5a. oD. 6a. 60. Ta. 7b. PTEROTOCRINUS PYRAMIDALIS Lyonand Cass... ..... . 798 The type specimen; lateral view of the calyx. (Coll. S. 8. Lyon.) PYEROTOCRINUS CHESTERENSIS Meek and Worthen ..... . 802 One of the type specimens; lateral aspect. (After Meek and Worthen.) Another type specimen, showing the posterior side of the calyx. (After Meek and Worthen.) ARHROMOCRIENU SHC MELPATISMIVONEE Ene 2 =... 9. « = . . 194 Postero-lateral view of the type specimen. (Coll. 8. 8. Lyon.) Ventral aspect of the same. a J) ot PTEROTOCRINUS CORONARIUS Lyon Ventral aspect of the type specimen. (Same collection.) Side view of the same; the dorsal cup not preserved. PrERorocRinvs ‘CRASSUS Meek nl ‘Worth Hig. 8. Posterior view of the type specimen. (After Meek and PrERorocrrnvs ACUTUS, var. BIFURCATUS Wetherby . er — Dai, eral aspect of the type specimen. (After Wetherby, y 9b. Ventral aspect of the same. aa : 10. Diagram, showing the , arrangement of the lower brachials i in 2 Peerotocrins. B PLATE LXXX. PAGE ACO SMES Secomuyueon Maal, co o 5 6 2 5 6 5 o 5 5 OE 1. Lateral view of the type specimen. (Dr. Yandell’s collection.) 2. Fragmentary specimen from Huntsville, Ala. (Coll. W. and Sp.) 3. The lower part of the dorsal cup; from Pulaski Co., Ky. (Coll. W. and Sp.) ACHOMMUMO ANA Wo GMCS, o co 6 co os 6 5 o v o o 0 S08 4. A large specimen with portions of the arms and stem. 5. A smaller specimen, enlarged (?). 6. The calyx somewhat flattened and enlarged (?). 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 (2). 8. Ventral aspect of a large specimen (2). 9. A specimen showing the calyx, the pendent arms, the turned up pinnules, and the stem. (All in the collection of W. and Sp.) ING ano) \iKOuwwsaspe \AVevelysponyie 4 56 5 «6 6 94 5 o 0 o « SOM 10a. Diagram made from the type specimen in the Illinois State Museum. 106. Showing the outlines of the specimen. a PLATE LXXX. CRINOIDEA CAMERATA. Heliotype Printing Co, Boston. AM Westergren del. PLATE LXXXI. PAGE WwuCMmamyconus Owissws Isle, 1.95 6 5 5 5 5 6 co 5 ew REO 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. Kucatyprocrinus Enropr 8. A. Miller . ...... =. ~. ~. 339 7a. A perfect specimen with arms, from Waldron, Ind. (Mus. Comp, Zodl.) 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 Sp.) 12. The plates constituting the ventral disk. Those forming the two lower rings showing the inner floor, those of the two upper the outer surface. (After Hall.) 13. Inner floor of basals and radials. (After Hall.) LAX] PLATE CRINOIDEA CAMERATA. aU SHAHARAARAULUL ern ut Pa il Bee Heliotype Printing Co, Boston. J. L.Ridgway del - ad Bae ie i@, ital, 12. 13. 14. PLATE LXXXII. PAGE DwCurvaenororsonos Ovens hl G 5 6 o 6 » 9 6 6 2 0 9 o GH 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.) DG CAuwADOoDerte aco WOU 5 6 o o co o 6 59 o oc p OHS . Dorsal aspect of the calyx. (After Worthen, the basals corrected.) . Side view of Miller’s type of H. Gorbyi. (After Miller.) DCNet) Iposmoyusone WV wl Sys, 5 2 5 6 co co 6 o o Gilt . A fine specimen with arms. (Illinois State Collection.) WuC Mewes Ominous Ie 6 6 6 1 5 6 5» 0 6 o 5 3 BHO Internal cast of the dorsal cup. (Coll. W. and Sp.) IHU CATER TO CRLNGU S| ECAC IOS s)e Neem VICI Tee nS ne oo eT 02 Internal cast of the calyx. (Coll. W. and Sp.) The anal tube. (Coll. W. C. Egan.) Evucanyprocrinus TuRBINATUS S.A. Miller. . . ..... . 361 Internal cast of calyx. (Coll. W. and Sp.) EUCALYPTOCRINUS PROBOSCIDALIS Miller. . ....... « 802 Internal cast; the type specimen. (After Miller.) EvucALYPTOCRINUS DECORUS Phillips. . A specimen from Dudley, England. (Coll. W. and Sp.) Figured for comparison with #. decorus Hall. PLATE LXXXIL. CRINOIDEA CAMERATA. cccdecdddcddad AANLR EH GEE! J.L.Ridgway A.N Heliotype Printing Co, Boston. Westergren del. vr a e e ‘ PLATE LXXXIII. PAGE EucALYPTOCRINUS INCONSPECTUS Ringueberg . . ... =. . . 846 Fig. 1. The type specimen. (Coll. Dr. Ringueberg.) 2. A specimen with arms. (Same collection.) HUCALVPTOCRINUS) DEPRESSUS) jo) Ate Mallets.) nnnOLO) 8. 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.) DoOAM MOCO: Cams Jel 5 6 5 5 5 9 6 6 6 6 9 ce BD 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.) HUCALYPTOCRINUS TUBLRGUDATUS S. Ay Mullen ee Ow 8. One of the type specimens. (Mus. Comp. Zoél.) 9, Another type specimen. (Same collection.) 10. Type of #. muralis Ringueberg (from his collection). HUCALYPTOCRINUS VENTRICOSUS W.and Sp. ..... .. . o4i 11. Specimen with arms. (Mus. Comp. Zodl.) 12. Dorsal aspect of the calyx. (Coll. W. and Sp.) DUCA MAMCCOUS Oooo Jel, 2 s 5s 2 6 @ 6 es 6 6 0 Be 13. Natural cast of the dorsal cup. (Coll. Thomas A. Greene.) OWinaiornsias) IpovNCieocisa WW BimGl So 6 2 5 5 o 5 3 > 5 « 5 GH 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. CArmGmonces comma Bll, 5 5 o + 2 6 2 0 0 0 0 oe 6 ODM 15. Natural cast of the calyx. (Coll. Thomas A. Greene.) 16. Impression from a natural mould. (Same collection.) 17. Probably an undescribed variety of C. cornutus. (Same collection.) CALLICRINUS ACANTHINUS Ringueherg . ..... +... . 056 18. Inner aspect of the dorsal cup; the type specimen. (Coll. Dr. Ringueberg.) IPRATE, LX CRINOIDEA CAMERATA. Hehotype Pnnting Co, Boston. A.M Westergren del. PUBLIC. M COMPAR fon : B=: USE hav 5 been pub eines and ‘XXVUL ‘ols LON: Oar) the publ of 16e A pr TG) Virecto ‘the ridge, Mass. lication to app on Loi y Cam logy, ; 0. 2 0 6 2h PS Biers SMITHSONIAN INSTITUTION LIBRARIES ini 088 00051 0404 ——- ye Zee