PLATE III. 



The Plates surrounding and closing the Peristome. 



Pagb 



Fig. la. Cyathocrinus Gilesi W. and Sp. The interradial plates abutting upon the 

 radials preserved, but those covering the peristome removed. (Coll. W. 



and Sp.) 95, .114 



15. Another specimen of the same species, with the interradial plates partly 

 covered by small marginal pieces ; — otherwise in the same condition as 

 fig. la. (Same collection.) 95 



2. Cyathoceinus beevisacculus "W. and Sp. (Ms.). Showing the disk ambulacra 



and the madreporite ; the large interradial plates exposed to view. (The 

 figure is drawn with the anal side up. Same collection.) .... 96, 114 



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



more asymmetrical, and the interradial plates covered by marginal pieces. 

 (Same collection.) 9C, 114 



4. Cyathoceinus . multibeachiatus Hall. Like fig. 3; but with the orals 



resorbed. (Same collection.) 96, 114 



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



closing large covering pieces which close the peristome. (Drawn with 

 anal side up. Zool. Biks Mus., Stockholm.) 96 



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



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



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



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



8. Cyathoceinus ljevis Angel. The orals partly resorbed. (Drawn with 



anal side up. Same collection.) 96, 114 



9. Thaumatocbinus eenovatus P. H. Carpenter. Having large symmetrical 



orals surrounded by perisome. (After Carpenter.) 88 



10. The ventral disk of Hyocrinus bethelliamis W. Thorn. The orals surrounded 



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



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



plates ; the orals consisting of four small plates and a larger one, sepa- 

 rated by the ambulacra ; the mouth opened out. (Coll. W. and Sp.) 88, 89, 101 



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

 12a. Posterior side of the oral pyramid. 



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



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



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



14. Coccocrinus rosaceus P. Roemer. The orals symmetrical ; separated from 



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



