4334 PROCEEDINGS OF THE ACADEMY OF [Dec. , 



known from so far north or northeast. It is more attenuated 

 above, and the peristome is notched on the left side of the termi- 

 nation or the superior lamella. 



Group of C. tanegashimce. 



Solid and strong TyrannophceduscB with the clausilium oblique 

 and thickened distally, the superior lamella separated from the 

 spiral lamella, which penetrates past the ventral side, accompanied 

 by the inferior lamella; lunella sub ventral; subcolumellar lamella 

 strongly emerging. There is a strong ridge or crest behind the 

 outer lip, parallel with it. 



Similar to the group of C. bilabrata in internal structure, but 

 differing in the crest behind the lip. Species are known from the 

 northeastern group of Kiukiu Islands, and from southern Kiushiu. 

 Species two: C. oxycyma, with a distinct upper palatal plica devel- 

 oped, length 14 mm., and C. tanegashimce, which has Ihe upper 

 palatal plica represented only by an inward bend of the upper end 

 of the lunella, length 16-1 8J- mrr. 



Clausilia oxycyma n. sp. PI. XXXVII, figs. 35, 36, 37, 38. 



Shell rimate, fusiform, rather slender, attenuated above, glossy, 

 rather dark red-brown when unworn ; finely striate, a little more 

 coarsely so on the last whorl. Whorls 9f to nearly 11, moderately 

 convex, the last three whorls of almost equal diameter, last whorl 

 compressed laterally, tapering, rising into a strong, rather acute 

 ridge or crest a short distance behind the lip and parallel with it. 

 Aperture piriform, slightly oblique, brown within; peristome nar- 

 rowly reflexed, continuous, white, scarcely emarginate at the posi- 

 tion of the superior lamella. Superior lamella small, marginal, 

 slightly oblique, not continuous ivith the spiral lamella. Spiral 

 lamella very high within, of equal length with the inferior lamella, 

 both continuing .past a ventral position. Inferior lamella very 

 deeply receding, twisted within. Subcolumellar lamella emerging 

 to the lip-edge, bounded by grooves. Principal plica strong, 

 Breaching from the dorsal to the ventral side. Luuella latero-ven- 

 tral, oblique, joining the middle of strong, rather' long, oblique, 

 upper and lower palatal plicse. 



Length 14, diam. 3 to 3J mm. 



Clausilium (PI. XXXVII, figs. 41, 42) moderately curved, the 



