AMATHINA. 133 



Section THYCA, H. and A. Adams, 1854. 

 C. ASTERICOLA, Ads. and Reeve. PL 40, fig. 88. 



High-conical, sculptured with fine close-set radiating riblets ; 

 white ; margin crenulated. Alt. 6 mill. 



Sooloo Sea, on the tubercle of a star-fish. 



Unfigured and doubtful species of Capulus. 



C. (THYCA) ELEGANS, Tapp. Canefri (unfigured). Papuan Inlands. 

 C. CYTHER^EA, Lesson (unfigured). Tahiti. 



C. PALEACEA, Menke (unfigured). Hob. unknown. 



C. JAPONICUS, A. Adams (unfigured). Japan. 



C. GARNOTII, Payr. = Gadinia. 



C. SHREEVEI, Conrad. = Hinge process of Pholas costata, Linn. 



Genus AMATHINA, Gray, 1842. 



A. TRICOSTATA, Gmel. PL 40, figs. 89, 90. 



White, apex posterior but not marginal, recurved, with distant 

 radiating low striae posteriorly and three strong anterior ridges, 

 diverging and causing a projection of the margin. 



Length,! inch. East Indies, Japan. 



Patella tricarinata, Linn., to which this is referred by H. and 

 A. Adams, is an entirely different shell. 



A. NOBILTS, A. Ad. PL 40, fig. 91. 



S'hell shaped like Capulus, solid, white ; apex median, acute, 

 involute, turned to the right; strongly bicarinated, posterior 

 margin dilated. Length, 25 mill. 



Saghalien Island, Japan. 



A. ANGUSTATA, Souverbie. PI. 40, fig. 92. 



Elongated, narrow, a little twisted, apex recurved, spiral ; with 

 three or four anteriorly directed strong carinations, the rest of 

 the surface with slighter radiating carinae. Length, 12 mill. 



N. Caledonia. 



A. TRTGONA, Sowb. (imfignred). Friendly Islands. 



A. BICARINATA, Pease (unfigured). Sandwich Islands. 



Judging from the descriptions, these two species are closely 

 allied, perhaps identical. 



