206 



PANAMIC DEEP SEA ECHINI. 



This species belongs to the group of Sehizaster of which S. PhUipjm is a 

 well known representative, though its anterior odd ambulacrum is far less 

 sunken (PL 102, fig. *). 



In a specimen 17 mm. in length (PI. 102, figs. 2, 3), Fig. 297, there are 

 as yet no genital pores. The apical system is very similar to that of S. 



17 uuii. 



Fig. 297. 8. i.atifroxs. 



Fig. 297 a . Sohizastek Fhii.ippii. 



After Loven. 



Townsendi (PI. 101, fig. 5) and of S. Philippii,Y\g. 297% though the ocular 

 plates are rectangular or pentagonal in S. latifrons and triangular in 

 S. Townsendi, Fig. 301. In a young specimen of S. Townsendi of not more 



40 mm. 



Fig. 297b. S. latifrons. 



Fig. 298. Schizaster Piiimppii. 



After Loven. 



than 10 mm. in length (PI. 101, figs. 7, S) there are three genital openings 

 as in larger specimens (PI. 101, figs. .', 8), but with only a few madreporite 

 pores. 



There is great similarity in the structure of the apical system of Schizaster 

 Townsendi, Fig. 301, S. latifrons, Fig. 297 b , S. PkiMppu, Fig. 298, S. fragUis, 



