446 PROCEEDINGS OF THE ACADEMY OF [1900. 



Clausilia Hirasei n. sp. PL XIV, figs. 8, 9, 10, 11. 



Shell small, solid, slenderly fusiform, regularly tapering above 

 to an obtuse apex; glossy, irregularly striate, chestnut brown. 

 Whorls 8-8 J, rather weakly convex, the last two long, last whorl 

 somewhat narrower, compressed. Aperture small, rather rhombic; 

 peristome narrowly expanded, a little thickened. Superior lamella 

 low, separated widely from the spiral lamella. Inferior lamella 

 immersed, becoming strong and vertical within. Subcolumellar 

 lamella weak but emerging. Principal plica less than a half -whorl 

 long, extending well inward beyond the lateral lunella. Upper 

 palatal plica oblique, not united with the lunella, which is nearly 

 straight above, curved below. Three short sutural plicae are 

 developed above the upper end of the lunella, the second one 

 shortest, upper one low ; within the upper end of the spiral lamella 

 there is sometimes an inserted lamella (lamella inserta), or perhaps 

 this is a recrudescence of the inferior lamella; and outside of it 

 there is a short fulcrum (lamella fulcrans, fig. 10, l.f. ) and a 

 longer parallel lamella (lamella parallela, fig. 10, l.p. ). 



Length 9.3, diam. 2.2, length of aperture 2.2 mm. 



Length 7.3, diam. 2.2 mm. 



Kagashima, Satsuma (Y. ilirase). 



This is, so far as I know, the smallest Japanese Clausilia known. 

 Internally it has the straightly vertical inferior lamella of Hemi- 

 phcedusa, but in several fresh specimens opened I found no clau- 

 silium. In the development of the sutural plicae it resembles 0. 

 hyperoptyx. The superior lamella is widely separated from the 

 spiral lamella, and there is a lamella inserta developed in some 

 examples. The internal complication is greater than in any other 

 Japanese species known to me. Fig. 10 of Plate XIV, is diagram- 

 matic. 



It is named in honor of Mr. Y. Hirase, of Kyoto, who has 

 brought to our knowledge a .large number of interesting Japanese 

 land snails. 

 Clausilia hyperoptyx n. sp. PI. XIV, figs. 12, 13, 14. 



Shell small, slender, moderately attenuated above, glossy, of 

 a dark, rich reddish-chestnut color, finely and rather irregularly, 

 not deeply, striate, the last whorl densely and more deeply so. 

 Whorls 8J-, convex, the last more flattened, a trifle narrower than 

 the preceding. Aperture ovate, the peristome thick, expanded, 



