WEST INDIAN AND PANAMIC LITTORAL SPECIES. 



237 



found on the Panama side, the sixth, Spatagocystis, being an East Indian 

 Archipelago and Western Pacific genus. 



On the Panainic side we have three genera, Dialithocidaris, Echinocrepis, 

 and Pilematechinus, which are not represented in the West Indian fauna. 

 Dialithocidaris may be said to represent the continental West Indian 

 Podocidan's; Echinocrepis and Pilematechinus being Southern Ocean genera; 

 Dermatodiadema and Phormosoma are Panamic abyssal, they are also West 



Indian continental genera. 



LITTORAL SPECIES.' 



West Indian. 

 Cidaris tribuloides Bl. 

 Dorocidaris papillata A. Ag. 21-842 fathoms. 



Arbacia Gray. 



A. punctulata Gray. 

 Diadenia Schyuv. 



D. setosum Gray. 



Echinometra Roud. 



E. subangularis Destnl. — 250. 



E. viridis A. Ag. —250. 

 Strongylocentrotus Br. 



S. Drobachiensis A. Ag. — 78. 

 Echinus Rond. 



E. elegaus Diib. & Kor. 80-1350. 



E. gracilis A. Ag. 92-200. 

 Toxopneustes Agass. 



T. variegatus A, Ag. — 300. 



Ilipponoe Gray. 



H. esculenta A. Ag. — 451. 

 Echinocyamus Gray. 



E. pusillus Gray. — 805. 

 Clypeaster Lamk. 



C. latissimus A. Ag. 



C. Ravenellii A. Ag. 



C. subdepressus Agass. — 120. 

 Echinanthus Breyu. 



E. rosaceus Gray. — 118. 

 Mellita Kl. 



M. sexporis A. Ag. — 270. 



M. testudinata Kl. —7. 



Panamic. 



Cidaris Thoiiarsii Val. 



Dorocidaris panamensis A. Ag. 66-112 fathoms 



A. stellata Gray. 



D. mexicanum A. Ag. 

 Astropyga Gray. 



A. pulvinata A. Ag. 



E. Vau Brunti A. Ag. 



S. mexicanus A, Ag. 



T. semituberculatus A. Ag. 

 T. pileolus Agass. — 10. 



H. depressa A. Ag. 



(E. sp. East India Islands.) 



C. rotundus A. Ag. 



E. testudiuarius Gray. — 120. 



M. pacifica Verr. 

 M. longifissa. 3Iich. 

 M. Stokesii A. Ag. 



^ The figures indicate the depths in fathoms; 21-842 gives the bathymetrical range; — 50 shows 

 that the range is littoral to 50 fathoms. 



