THE CONCHOLOGICAL MAGAZINE 



41 



from any part of the Japanese Empire, though the subgenus Boysidia 

 is of common occurrence in China. 



Fig. 2. Hypselostoma insiilarum. 



Hypselostoma insularum n. sp. Fig. 2. 



The shell is very small, conic, with wide, nearly flat base ; thin, 

 pale brown, dull and lusterless, faintly striate, and encircled with 

 minute spiral striae. Whorls 4^, convex. The penultimate whorl 

 becomes flat in its last half. The last whorl has a strong but not 

 acute peripheral keel, which does not reach to the aperture. Above 

 the keel the whorl is flattened and concave ; below it is slightly 

 convex. Near the aperture the whorl is straightened, loses the keel 

 and becomes convex above and below, somewhat tubular. It 

 ascends slowly. The base is weakly convex with a minute central 

 perforation and a long, curved, umbilical suture. The aperture 

 stands free of the preceding whorl, and looks upward somewhat. 

 It is irregularly rounded. The peristome is continuous, free, thin 



