1901.] NATURAL SCIENCES OF PHILADELPHIA. 415 



ginate or notched, a somewhat thickened, finger-like and more 

 curved process extending downward on the coluraellar side; 

 proximal end passing gradually into the rather broad filament. 



Length 34, diam. 7.8, longest axis of aperture 9.4 mm. 



Length 30.5, diam. 7.5, longest axis of aperture 9 mm. 



Oshima (Mr. Y. Hirase, No. 652). 



Readily known by its large size and the peculiar shape of the 

 aperture. 

 Clausilia oshimae n. sp. PI. XXII, figs. 5, 6. 



Shell fusiform, the upper third slender and somewhat attenuated, 

 the lower half rather swollen; penultimate whorl widest. Very 

 solid and strong. Pale brownish, more or less eroded. Closely 

 and rather strongly striate. Apex small, the first whorl rapidly 

 increasing, next three or four whorls very slowly widening; whorls 

 about 11J, the last whorl tapering, laterally compressed, flattened, 

 having a shallow pit behind the middle of the outer lip, rounded 

 at the base. Aperture ear-shaped, oblique, produced in a deep 

 retracted sinulus above. Peristome reflexed, thickened, a slight 

 ridge running behind the outer lip parallel with it; outer lip 

 obtusely toothed at the termination of the principal plica, thin 

 above, rather broad below the tooth. Inner lip projecting in the 

 middle, cut into six or eight rounded, unequal interlamellar folds, 

 and similarly or more weakly crenate to or below the subcolumellar 

 lamella. Superior lamella vertical, emerging beyond the general 

 level of the peristome, continuous with the spiral lamella. Infe- 

 rior lamella very prominently projecting into the aperture, subhori- 

 zontal and somewhat thickened below. Subcolumellar lamella 

 wholly immersed, but replaced on the lip by rugae occupying its 

 place. Principal plica very long, reaching to the lip and running 

 inward over a whorl; very strong. Upper palatal plica short, 

 weak and lateral; lower palatal plica very strong and long, its 

 lower end visible within the aperture, in an oblique view. Lunella 

 apparently wanting. Within, the inferior lamella is a very high, 

 strongly but somewhat irregularly spiral plate; the spiral lamella 

 is also very high, almost touching the principal plica; and both 

 lamellae penetrate far past the ventral side. The subcolumellar la- 

 mella is short as usual, but strong near its deeply immersed lower end. 



Length 22.5, diam. 4.5, longest axis of aperture 5.6 mm. 



Length 21, diam. 4.5, longest axis of aperture 5 mm. 



