MUSEUM OF COMPARATIVE ZOOLOGY. 71 



Station 319. 2G2 fathoms. Lat. 32° 25' 0" N., Long. 77° 42' 30" W. 



320. 2.j7 " " 32° 33' 15" N., " 77° 30' 10" W. 



xxii. (Bartlett)* 250 " " 19° is' 47" X., " 77° 23' 0" W. 



Porocidaris Sharreri A. Ac. n. sp. 



Tliis is a larger species than eitlier of the recent ones thus far known. The 

 only two large individuals collected are males. A small female measuring slightly 

 over an incli in diameter, shows that, as in P. elegans, the genital openings are 

 placed within the genital plates. The abactinal system, which is but sparsely 

 covered by papillae, is remarkable for the comparatively larger size of the anal 

 system than in the other species of the genus, and for the elongate genital and 

 ocular plates. 



The primary radioles are smooth, and uniformly tapering in one of the speci- 

 mens, wliicli is of a light greenish pink color when alive ; the spines are white, 

 with a delicate brownish pink base. In the other large specimen they vary 

 greatly in shape, from the peculiar serrated short, flattened spines surrounding the 

 actinostome characteristic of this genus to long slender cylindrical spines, straight, 

 or sometimes slightly curved, equalling in length twice the diameter of the test, 

 and finely fluted for the whole length, or the shorter radioles gradually becoming 

 thicker towards the tip, with coarser fluting, and we find some spines with 

 slightly cupuliform tips, as in Goniocidaris. The largest specimen measures fully 

 three inches in diameter. 



Station 151. 35G fathoms. Off Nevis. 



152. 122 " " St. Kitts. 



297. 123 « " Barbados. 



Salenia varispina A. Ao. 



A large number of specimens of this species, in all stages of growth, were 

 collected by the "Blake" during the season 1878-79. 



* A few stations marked (Bartlett) were occupied hy Commander Bartlett 

 during the winter of 1879-80, while surveying in the " Blake " the western part of 

 the Caribbean. 



