212 PROCEEDINGS OF THE AMERICAN ACADEMY 



Schizaster japonicus, A. Ag., nov. sp. 



Differs from S. ventricosus in having the posterior ambulacra pro- 

 portionally longer, and forming a more acute angle with the longitudi- 

 nal axis. It has a very distinct lateral and subanal fasciole ; keel of 

 median posterior interambulacral space forming a high crest at that 

 extremity of the test, while S. ventricosus is remarkable for its com- 

 paratively flattened and rounded posterior extremity ; ambulacra also 

 more deeply sunken, much as in S. canaliferus and S. Philippii. 

 These characters are early developed, and can serve, even in quite small 

 specimens, readily to distinguish the two species. — Off Yokohama, 

 8-50 fathoms. 



