1908 



NATURAL SCIENCES OF PHILADELPHIA. 



581 



Fig. 11. 



-a, b, C. tokarana; c, C. t. saccati- 

 basis, short form. 



of the last whorl finely and 

 rather sharply striate. Whorls 

 7^ to 9, slightly convex, the 

 last flattened at the sides, very 

 convex and somewhat sack- 

 like at the base. The aperture 

 is rhombic, peristome thin, 

 very narrowly reflexed, con- 

 tinuous. Superior lamella 

 is small, thin and vertical, 

 continuous with the spiral 

 lamella, which is low and 

 thread-like throughout, and 

 continues inward to a point 

 above the columella. The 

 inferior lamella recedes deeply, 

 and is visible as a prominent 

 fold in an oblique view in the 

 mouth. Inside it is broad 

 and ascends in a spiral curve; 



it is continued low and thread-like parallel to the spiral lamella, and 

 penetrates more deeply than that. The subcolumellar lamella emerges 

 weakly. The principal plica is short, dorso-lateral. The very short 

 or subobsolete upper palatal plica joins the very oblique, slightly 

 curved lunella. Sutural plicae, fulcrum and parallel plica are well 

 developed (fig. 11, a). 



Length 11, diam. 2.8 mm.; whorls 8|. 

 9, " 2.25 " " 1\. 



The clausilium (fig. 11,6) is broad, parallel-sided, rounded at the 

 apex, strongly curved in the middle, dilated on the palatal side of the 

 filament. 



Suwanose-jima, Osumi. Types No. 95678 A. N. S. P., from No. 

 1592a of Mr. Hirase's collection. Also Tokara-jima, No. 1592 of 

 Mr. Hirase's collection, and Akuseki-jima, No. 1548 of Mr. Hirase's 

 collection. 



This species is related to C. t. saccatihasis, but the apical whorls are 

 smaller, the penultimate whorl is much less swollen, in. a dorsal view; 

 the shell is less distinctly striate, and is paler. The principal plica is 

 shorter in C. tokarana. 



In the specimens from Tokara-jima the superior and spiral lamellae 

 are separated, and the inward continuation of the inferior lamella 



