574 



PROCEEDINGS OF THE ACADEMY OF 



[Dec, 



Iziihara. 



Tsutsu. 



A. N. S. P., from No. 

 1550 of Mr. Hirase's collection. Also Tsutsu and Kashitake, Tsushima. 



The specimens vary remarkably in contour. Three examples from 

 Tsutsu are figured. 

 Clausilia hemileuca n. sp. PI. XXX, fig, 6; PI. XXXI, fig. ii. 



The shell is long and rather slender, the upper half tapering and 

 attenuate; glossy; finely and distinctly striate, the earliest whorls 

 worn; lower half of each whorl dark reddish-brown, upper half white, 

 the base of the last whorl and a streak over the lunella also white. 

 Whorls about 10^, moderately convex, the second, third and fourth 

 of about equal diameter, last whorl flattened laterally. Aperture 



Fig. 7, Clausilia hemileuca. 



ovate, the sinulus shghtly retracted. Peristome expanded and reflexed, 

 thick, white, notched over the superior lamella, which is compressed, 

 vertical and marginal, continuous with the spiral lamella, which is 

 rather high and penetrates inward to a point above the outer lip. 

 The inferior lamella recedes deeply, but in oblique view is visible as 

 a fold within the throat ; in the back it ascends obliquely, being slightly 

 sigmoid, and it is thickened below. It penetrates less deeply than the 

 superior lamella. The subcolumellar lamella is deeply immersed, 

 not visible in the mouth. The principal plica is about a half whorl 

 long, approaching the aperture. Upper palatal plica short and curved, 

 not connected with the oblique, curved lunella (fig. 76). 



