1901.] NATURAL SCIENCES OF PHILADELPHIA. 417 



Clausilia mima n. sp. PI. XXIII, figs. 37, 38, 39. 



Shell small, fusiform, rather obese, but rapidly tapering and 

 conspicuously attenuated above ; thin and not very strong, pale 

 brown, densely and finely rib-striate. Whorls 8^ to 9, convex, 

 the apex rather large, next three or four whorls widening but 

 little; last half of the last whorl much contracted, flattened. 

 Aperture somewhat oblique, small, piriform, with moderately well- 

 defined sinulus. Peristome reflexed, slightly thickened, the outer 

 margin excavated above, the upper and right margins more or less 

 crenulate, the creuulation varying from strong to subobsolete in 

 difterent specimens. Superior lamella vertical, emerging a little 

 beyond the general level of the peristome, slightly wider or bifid 

 at the margin; continuous with the spiral lamella. Inferior 

 lamella forming a rather strong subhorizontal fold within, not 

 emerging to the peristome. Subcolumellar lamella emerging, 

 marginal. Principal plica about a half whorl long, extending 

 from the dorsal to the middle of the ventral side. Upper palatal 

 plica lateral, arcuate, converging inward toward the principal 

 plica, the outer end contiguous to the lunella, the upper end of 

 which curves toward and is almost united with it. Lunella lateral 

 in position, oblique, weak above, strong below, where it unites 

 with the middle of a long, very strong and angularly bent lower 

 palatal plica. The subcolumellar lamella is abruptly and strongly 

 dilated in the region of the lower palatal plica, and is bent over 

 toward it; beyond this dilation it curves abruptly and ascends the 

 internal column in the usual manner, expands again and turns 

 toward the right, parallel to the other lamellre upon the roof of 

 the penultimate whorl. The inferior lamella within the last 

 whorl is stout, liigh, very strongly spiral, and with the spiral 

 lamella continues inward past the ventral side, upon which the 

 three lamellte run parallel. 



Length 13^, diam. 3^ mm. 



Length 11^, diam. 3 mm. 



Clausilium (PI. XXII, figs. 17, 18) broad, strongly curved, 

 broadly rounded along the outer margin, truncate at the apex, and 

 produced on the columellar side into a long finger-like process. 



Oshima (Mr. Y. Hirase, No. 654). 



Much smaller than other species of the section, and strongly 

 attenuated above, like C. hrevior v. Mart. The process of the 

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