814 PROCEEDINGS OF THE ACADEMY OF [DeC, 



species of the group of C. sublunellata, but the sculpture is stronger 

 and the palatal armature better developed. The smaller C. decussata 

 Marts., from Tsukuba-san, Hitachi, may be related, but I have not 

 seen that species. The spiral striae are not sufficiently indicated in 

 fig. 41. 



Clausilia hosayaka n. sp. PI. LV, figs. 61, 62, 63. 



Shell slender, regularly tapering from the penultimate whorl, the 

 upper third attenuate, apex obtuse ; thin but moderately strong, light 

 brown. Surface glossy, very finely striate. Whorls about 13^, mod- 

 erately convex, the last somewhat flattened on the back. Aperture 

 small, oblique, squarish-piriform, the peristome reflexed, somewhat 

 thickened within, continuous, the parietal margin shortly raised, and 

 emarginate above the superior lamella. Superior lamella compressed, 

 only slightly oblique, continuous with the spiral lamella, which pene- 

 trates to the middle of the ventral side. Inferior lamella receding, visi- 

 ble in the aperture as a small fold, straightly ascending within the back, 

 penetrating a little further inward than the spiral lamella. Subcolumellar 

 lamella either emerging to the lip-edge or immersed. Principal plica 

 short, chiefly dorsal. Upper palatal plica short, oblique, not connected 

 with the very weak lateral lunella, which is obsolete below, and curves 

 inward above or connects with a short, weak second palatal plica. 

 There is no lower palatal plica. 



Length 22.5, diam. 4.5 mm. 



Length 21.5, diam. 4.3 mm. 



Kamomura, Shima. Types No. 86,521, A. N. S. P., from No. 1,176 

 of Mr. Hirase's collection. 



By its palatal armature this species belongs to the Hemiphsedusan 

 group of C. sublunellata. It is readily distinguished from other known 

 species of that group by the greater number of whorls and more slender 

 spire. The lunella is very feebly developed, and probably will be 

 found to be sometimes obsolete, as in some other species of the group. 



Clausilia koshikijimana n. sp. PI. LV, figs. 53, 54, 55, 56, 57. 



Shell fusiform, much attenuated above, very solid and strong; pale 

 yellow, somewhat glossy, closely and finely striate. Whorls 9, the first 

 quite small, the rest convex, the last whorl somewdiat flattened. The 

 aperture is ovate and projects shortly free; peristome white, reflexed 

 and thickened within. The superior lamella is marginal, low and 

 ol)lique, continuous with the spiral lamella, which penetrates to a 

 point above the sinulus. The inferior lamella recedes deeply, is straight 

 and oblique within, and thickened at the lower end. It does not pene- 



