7-i BULLETIN OF THE 



than in that species immediately surrounding the anal opening, as in A. tonsum, 

 but much smaller. 



The primary spines are also proportionally longer and more slender, more as in 

 A. tonsum, but with the proportionally bare intertubercular spaces characteristic of 

 A. microtuberculatum. When alive this species is of a light violet or grayish 

 pink, with spines of the same tint. 



)2'W. 



Aspidodiadema Jacobyi A. Ac. n. sp. 



This is the largest species of the genus ; it is intermediate between A. tonsum 

 and A. microtuberculatum, having comparatively stout spines, slightly curved as 

 in the latter species, but having the more numerous coronal plates of the former 

 species and its larger primary ambulacral tubercles with more closely packed 

 primaries. 



The anal system is protected near the anal opening with six plates (five large, 

 one small), as in ^. tonsum ; they cover but a small part of the centre of the anal 

 system. The color of this species is either a greenish chocolate, with same color 

 extending along base of shaft of the white spines, or of a lighter dirty yellowish 

 green. The largest specimen collected measured over an inch in diameter. 



Asthenosoma hystrix A. Ag. 



This species is globular in outline when alive, but slightly depressed on the 

 actinal side, varying from a dark claret to a grayish pink color. 



Station 132. 115 fathoms. Off Santa Cruz. 



" 273. 103 " " Barbados. 



" 294. 137 



" 297. 123 



" 299. 140 



