PLATE III. 



The Plates surrounding and closing the Peristome. 



Page 

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

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



and Sp.) 95, 114 



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

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

 fig. la. (Same collection.) 05 



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



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

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



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



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

 (Same collection.) 96, 114 



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



resorbed. (Same collection.) 96, 114 



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



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

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



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



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



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



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



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



anal side up. Same collection.) 96, 114 



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



orals surrounded by perisome. (After Carpenter.) 88 



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



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



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



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

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



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

 12a. Posterior side of the oral pyramid. 



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



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



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



14. CoccocRiNus eosaceus p. Eoemer. The orals symmetrical; separated from 



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



