CHARACTERISTIC DEEP-SEA TYPES. 



STARFISHES. 



103 



novelties described by Perrier, the species of Goniopecten reveal 



many points of similarity in the structure of Pentagonaster ( Fig. 



377), Archaster (Fig-. 378), and Astropecten, which were all 



supposed to be radically distinct. The 



genus Anthenoides (Fig- 379) is interme- "* 



diate between Anthenea, with large pedi- • 



cellariae, and Pentagonaster, with smaller i^'' f^^~'~? 



ones and granules. Ctenaster (Fig. 380), 



on the other hand, recalls a gigantic Cte- 



nodiscus without ventral scales ; its mar- / jr ^ \ s 



ginal plates ally it to the Goniasteridse, and 



the structure of its dorsal skeleton to such 



genera as Solaster and Acanthaster. Ra- 



diaster (Fig. 381), a large five -armed starfish, with bunches 



of spines like jSolaste7' endeca, of which it possesses the inar- 



Fi 



f. 378. — Archaster pul- 

 cher. 1. (Perrier.) 



Fig. 879. — Anthenoides Peircei. 



(Perrier.) 



