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- 
cellarie, 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 Goniasteride, and 
the structure of its dorsal skeleton to such 
genera as Solaster and Acanthaster. Ra- 
Fig. 378. — Archaste» pul- 
cher. 4. (Perrier) 
diaster (Fig. 381), a large five-armed starfish, with bunches 
of spines like Solaster endeca, of which it possesses the mar- 
Fig. 379. — Anthenoides Peircei. 3. (Perrier) 
