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 Panamic 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 

 Podocidaris; Echinocrepis and Pilematechinus being Southern Ocean genera; 

 Dermatodiadema and Phormosoma are Panamic abyssal, they are also West 



Indian continental genera. 



LITTORAL SPECIES. 1 



West Indian. Panamic. 



Cidaris tribuloides HI. Cidaris Thouarsii Val. 



I (oroeidaris papillata A. Ag. 21-812 fathoms. I torocidaris panamensis A. Ag. 66-1 12 fathoms 

 Arbaeia Gray. 



A. punctulata Gray. 

 Diadema Schynv. 

 D. setosum Gray. 



Echinometra Rond. 



E. subaugularis Desml. — 250. 



E. viridis A. Ag. —250. 

 Strongylocentrotus Br. 



S. Drobachiensis A. Ag. — 78. 

 Echinus Komi. 



E. elegans Dub. & Ivor. 80-1350. 



E. gracilis A. Ag. 92-200. 

 Toxopneustes Agass. 



T. variegatus A. Ag. — 300. 



Hipponoe 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 Breyn. 



E. rosaceus Gray. — 118. 



Mellita Kl. 



M. sexporis A. Ag. — 270. 

 M. testudinata Kl.  — 7. 



A. stellata ( rray. 



D. mexicannm A. Ag. 

 Astropyga ( rray. 



A. pulvinata A. Ag. 



E. Van Hriinti A. Ag. 



S. mexicanus A. Ag. 



T. semituberculatus A. Ag. 

 T. pileolus Agass. — 10. 



II. depressa A. Ag. 



(E. sp. East India Islands, i 



C. rotundus A. Ag. 



E. testudinarius Gray. — 120. 



M. pacifica Verr. 

 M. longifissa. Mich. 

 M. Stokesii A. Ag. 



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

 that the range is littoral to 50 fathoms. 



