1901.] >^\TURAL SCIENCES OF PIIILADELPiriA. 645 



Clausilia entospira Pilsbry. ri. XXXIX, figs. 72-75. 



Pilsbry, tlieso Proceedings, Vol. LIII, p. 501 (October 2, 1901). 



Shell rathei" obosely fusiforin, attenuated, with somewhat concave 

 outlines above, extremely thick and strong, nearly .smooth, glossy, 

 the latter half of the last whorl becoming coarsely striate; flesh- 

 colored with buff patches and streaks, eroded in spols. Whorls 

 about 8^, convex, the last tapering below. Aperture long-ovate, 

 the peristome slightly reflexed, very much thickened within, shortly 

 free above. Superior lamella small but rather stout, marginal, 

 very widely separated from the spiral lamella, which is quite small, 

 short and latero-ventral. Inferior lamella receding, in oblique 

 view (fig. 72) appearing very prominent and squarish; very 

 dronrjhj spiral xvltlun, heavily thickened at the lower end, ascend- 

 ing merely to a lateral position. Subcolumellar lamella immersed, 

 interrupted within. Principal plica slender, short and low, lateral. 

 Lunella latero-ventral, oblique, curved, running inward below, 

 tapering at the ends, exces-nvehj thick and strong in the middle. No 

 palatal plicise 



Length scarcely 10, diam. 2.4 mm. 



Clausilium (PI. XXXIX, figs. 76, 77) moderately long, but 

 being strongly curved near the middle, nearly at a right angle, it 

 appears short; distal half rapidly tapering, straight along the 

 palatal, convex at the columellar side, thickened at the apex. 

 Proximal half rather wide and parallel-sided; deeply excised on 

 the columellar side of the filament. 



Tane-ga-shima, Osumi, one of the Xortlieasteru Group of the 

 Riukiu Islands. Types Xo. 82,558 Coll. A. X. S. P., from Xo. 

 663a of Mr. Hirase's collection. 



A few examples were with the specimens of ('. Pinto. Mr. 

 Hirase remarks that it is very rare. It is an excessively peculiar 

 species, and I was formerly at a loss as to its affinities. The broadly 

 spiral trend of the inferior lamella, which is moreover very short 

 within, the weak, short spiral lamella and principal plica and the 

 peculiar lunella are a cirabination of features unlike any Oriental 

 species known to me. The squarish lower end of the infei'ior lamella 

 is sometimes visible in a front view (fig. 74), but in other speci- 

 mens it recede-9, and is seen, only in oblique view (figs. 72, 73). 

 The clausilium is quite unlike that of any other known Japanese 

 species. The lunella might almost as well be considered a greatly 



