826 PROCEEDINGS OF THE ACADEMY OF [Dec., 



a 1 . Shell brown, 13 to 15 mm. long; about 9 to 10 whorls. Distal 

 half of the clausilium flat. Oshima, . . . . C. munus. 



Clausilia purissima n. sp. PI. LV, figs. 47, 48, 49. 



Shell slenderly fusiform, rather thin, transparent, with a greenish 

 tint, the surface polished, with a brilliant gloss, faintly marked with 

 slight growth-wrinkles. Spire regularly tapering to the obtuse apex, 

 the lateral outlines nearly straight. Whorls 10, convex, parted by a 

 well-marked suture, the last whorl a little compressed laterally. Aper- 

 ture oval, the peristome slightly expanded, a little thickened, continu- 

 ous, the parietal margin barely free, short and straightened. Superior 

 lamella marginal, rather high and thin, oblique, continuous with the 

 spiral lamella, which penetrates about to the middle of the ventral 

 side. Inferior lamella hardly visible in a front view, receding, 

 straightly ascending, shorter within than the superior lamella. Sub- 

 columellar lamella very deeply immersed, penetrating inward about 

 as far as the inferior lamella. Principal plica short, dorso-lateral, 

 visible in the throat, penetrating slightly past a lateral position. 

 Upper palatal plica short, dorsb-lateral. Lunella oblique, straight, 

 strongly curving inward at the lower end, not quite reaching the upper 

 palatal plica. 



Length 12.3 to 12.8, diam. 2.3 mm. 



Clausilium (fig. 47) parallel-sided, the apex rounded; abruptly and 

 deeply excised on the columellar side of the filament. 



Miyakejima, Izu. Types No. 85,731, A. N. S. P., from No. 1,089 

 of Mr. Hirase's collection. 



In this exquisite species the shell is so pellucid that the plicae, lamellae 

 and axis may be seen through. It is not closely related to any known 

 species, but seems to belong to a group characteristic of the islands 

 south of Kyushu. It is with some doubt, however, that I place C. 

 purissima in the group Hemizaptyx. It may belong to Hemiphcedusa. 

 Clausilia asperata n. sp. PI. LV, figs. 42, 43, 44. 



Shell fusiform, the spire noticeably attenuated above, moderately 

 strong, grayish-brown; glossy; very finely striate, the back of the last 

 whorl sculptured with narrow, widely spaced riblets. Whorls 8J to 9, 

 convex, the last tapering. Aperture ovate, the peristome thin, ex- 

 panded and reflexed, shortly free and projecting above. Superior 

 lamella small, marginal, continuous with the spiral lamella, which is 

 rather high within, and penetrates nearly to the middle of the ventral 

 side. Inferior lamella deeply receding, not visible from in front; 

 inside it is nearly straight, thickened and quite high; penetrating a 

 little less deeply than the spiral lamella. The subcolumellar lamella 



