1901.] NATURAL SCIENCES OF PHILADELPHIA. 481 



view only, straightened inside, thickened below. Subcolumellar 

 lamella immersed, the end visible in an oblique view, but usually a 

 weak continuation reaches to the edge of the peristome. Princi- 

 pal plica a half-whorl long, the lower end visible within the aper- 

 ture ; extending inward beyond the lunella. Upper palatal plica 

 short, joined in the middle to the narrow, well -developed lunella, 

 which descends obliquely, and curves backward below; the re- 

 curved lower end representing a lower palatal fold. Clausilium 

 (PI. XXVII, figs. 19, 20, 21) narrow, parallel -sided, abruptly 

 curved where it passes into the wide filament, straightened toward 

 the rounded, hardly angular apex; columellar side emarginate at 

 the origin of the filament. 



Length 11,5, diam. 2.8 mm. 



Kashima, Harima (Mr. Y. Hirase). Types No. 79,133 Coll. 

 A. N. S. P. 



Allied to 0. awajiensis Pils., but that species is far more obese, 

 with tapering, compressed last whorl. 

 Clausilia perignobilis n. sp. PI. XXVI, figs. 13, 14, 15. 



Shell rimate, fusiform, attenuated above, moderately swollen 

 below, pale brown, densely and finely striate. Whorls about 10, 

 moderately convex, the early ones corneous, forming a slender 

 apical portion, the last whorl somewhat compressed laterally. Aper- 

 ture trapezoidal-piriform, slightly oblique, the sinulus somewhat 

 retracted; peristome whitish, more or less emarginate above, very 

 narrowly reflexed. Superior lamella small, vertical, reaching the 

 margin, continuous with the spiral lamella. Inferior lamella very 

 deeply receding, hardly visible from the mouth except in an 

 oblique view. Subcolumellar lamella emerging, usually distinct to 

 the lip-edge. Principal plica fully a half-whorl long, visible in 

 the aperture, and extending inward beyond the upper palatal 

 plica. Lunella lateral, oblique, shaped like the letter J, the lower 

 end curving inward, the upper end joining the middle of a rather 

 short upper palatal plica, which converges inwardly toward the 

 principal plica. 



Length 14.5, diam. 3 mm. ; longest axis of aperture 3.2 mm. 



Length 12.3, diam. 2.7 mm. 



Length 12.3, diam. 3 mm. 



Okinoshima. Tosa, Shikoku Island (types No. 80.843 Coll. 

 A. N. S. P. ; from No. 584 of Mr. Hirase's collection). 

 31 



