1904.] NATURAL SCIENCES OF PHILADELPHIA. 811 



The clausilium (PI. LIV, figs. 27, 28) is long and narrow, attenuated 

 distally, and not excised near the filament. 



Nagashima, Satsuma. Types No. 87,607, A. N. S. P., from No. 

 1,243 of Mr. Hirase's collection. 



The type specimen is colored like C. hiraseana; the superior is con- 

 tinuous with the spiral lamella, and the subcolumellar lamella emerges, 

 though it does not reach the lip-edge. 



Another specimen, evidently from a more moist locality, is eroded, 

 dull whitish, partially overgrown with green algse. The subcolumellar 

 lamella is immersed, and the superior lamella is separated from the 

 spiral. The clausilium is like that of C. hiraseana. Without a larger 

 series of specimens it is impossible to tell whether this represents 

 another race or not. 



Section HEMIPH^DUSA Bttg. 

 Clausilia ventriluna n. sp. PI. LV, figs. 68, 59, 60. 



Shell slender, fusiform, attenuated toward the apex; rather solid 

 and strong; brown, somewhat glossy; very closely and finely striate, 

 the striae a little closer on the back of the last whorl. Wliorls 9^ or 

 10, the first one globose, sometimes self-amputated. The attenuated 

 early whorls are very convex, the later ones less so, and the last whorl 

 is somewhat flattened laterally, with a noticeable impression marking 

 the position of the principal plica. The aperture is trapezoidal-ovate, 

 somewhat oblique, the peristome reflexed, slightly thickened, con- 

 tinuous and well raised across the parietal wall. The superior lamella 

 is small, marginal and oblique, continuous with the spiral lamella, 

 which is very high within and penetrates across the ventral side. The 

 inferior lamella recedes deeply, and within the back ascends obliquely, 

 and is nearly straight. It is far smaller and lower than the spiral 

 lamella, but penetrates as deeply. The subcolumellar lamella emerges 

 to the lip-edge. The principal plica is very long, reaching nearly to 

 the peristome, and penetrating inward to a point above the sinulus. 

 The lunella with the upper and lower palatal plicae is shaped like the 

 letter I, and is nearly ventral in position. 



Length 15.7, diam. 3 mm. 



Length 15.3, diam. 3.4 mm. 



The clausilium (PI. LV, figs. 58, 59) is long and narrow, parallel-sided, 

 obliquely rounded distally, and very deeply excised on the columellar 

 side of the filament. 



Yasuda-mura. Tosa. Types No. 87,576, A. N. S. P., from No, 1,011 

 of Mr. Hirase's collection. 



