1901.] NATURAL SCIENCES OF PHILADELPHIA. 645 



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



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



Shell rather obesely fusiform, 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 spots. Whorls 

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

 the peristoine 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 1 ate ro- ventral. Inferior lamella receding, in oblique 

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

 strongly spiral within, 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, excessively thick and strong in the middle. No 

 palatal plicae 



Length scarcely 10, diam. 2.4 ram. 



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 Northeastern Group of the 

 Riukiu Islands. Types No. 82,558 Coll. A. N. S. P., from No. 

 663a of Mr. Hirase's collection. 



A few examples were with the specimens of C. 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 combination of features unlike any Oriental 

 species known to me. The squarish lower end of the inferior lamella 

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

 mens it recedes, 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 



