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- 

 cellarise, and Pentagonaster, with smaller 

 ones and granules. Ctenaster (Fig. 380), 

 on the other hand, recalls a gigantic Cte- 

 nodiscus without ventral scales ; its mar- 

 ginal plates ally it to the Goniasteridae, 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 tiolaster endeca, of which it possesses the inar- 



Fig. 378. Archaster pul- 

 cher. ^. (Perrier.) 



Fig. 379. Anthenoides Peircei. %. (Perrier. 



