1902.] NATURAL SCIENCES OF PHILADELPHIA. 525 



Clausilia subacnlus n. sp. PI. XXVIII, 38, 39, 40. 



Clausilia aculus Benson, Boettger, Jahrbiicher d. deutschen malak 



Ges., V, 1878, p. 49, PI. 3, fig. 8a, b. Kobelt, Fauna moll. 



extramar. Jap., p. 71, PL 8, fig. 19. Not C. aculus Benson, cf 



Boettger, Jahrbiiclier, VI, 1879, p. 108. 

 Clausilia proba A. Ad., Boettger, Jahrbiicher, VI, 1879, p. 108. 



Not V. proba A. Ad., Ann. Mag. N. H. (4), I, 1868, p. 471. 



Shell long-fusiform, the penultimate whorl widest, those above 

 regularly tapering, the spire slender above, lateral outlines straight, 

 apex rather acute; color varying from yellowish-brown to pale 

 olive-brown. Surface glossy, distinctly and somewhat coarsely 

 striate, the last whorl more strongly so. Whorls about 10, rather 

 convex, the last shortly free in front. Aperture wide-piriform, the 

 upper margin a little sinuate. Peristome white, somewhat thick- 

 ened, expanded and narrowly reflexed. Superior lamella merely a 

 low cord terminating in a small thickening of the peristome, con- 

 tinuous within with the spiral lamella, which penetrates nearly to 

 the middle of the ventral side. Inferior lamella receding, be- 

 coming high within, only moderately approaching the superior 

 lamella, and decidedly shorter inside than the spiral lamella. 

 Subcolumellar lamella barely emerging. Principal plica chiefly 

 dorsal, being visible in the throat and extending to but hardly 

 past the middle of the right side. Upper palatal plica moderately 

 long, oblique, connected near its lower end with an arcuate lunella, 

 which is very low or almost interrupted in the middle, becomes 

 distinct again below, where it is recurved in a short lower palatal 

 plica. 



Length 16, diam. 3.5 mm. 



Length 13, diam. 3 mm. 



Clausilium (PI. XXVIII, figs. 41, 42) strongly curved, wide 

 below, rounded and somewhat thickened at the apex, the margins 

 converging somewhat upward, rather deeply excised on the colu- 

 mellar side of the filament. 



Nagasaki, in western Kyushu. Types No. 60,372, A. N. S. P., 

 received from Mr. B. Schmacker. 



Prof. Dr. Boettger has already pointed out the differences 

 between this species and C. tau. The superior lamella in the 

 former is lower, a mere cord; the striation is stronger, and the 

 upper palatal plica smaller. The palatal structures do not shine 

 white through the shell so conspicuously as in C. tau. Inside, the 



