1007.] NATURAL SCIEXCES OF PIIILA DELPHI A. 509 



Clausilia exulaiis n ^i'. IM. X.\\l\'. Tiks. ^o. 11, 42. 



Shell fusifonn, the spire attenuated above, rather thin, glossy, 

 yellowish or brownish corneous, somewhat ti-ansparent except when 

 old. Whorls 9 to 9^, the earlier, atteiuiated ones quite convex, the 

 lai-iier later ones less so, the last whorl tapering, laterally flattened, 

 shortly free in front. Surface weakly striatulate, the last whorl 

 becoming strongly evenly striate on the back, rounded below. Aper- 

 ture small, piriform-ovate, the peristome expanded and reflexed, rather 

 thin. Superior lamella small, short and thin, broadly separated from 

 the small, low and short spiral lamella. Inferior lamella deeply 

 receding, appearing as a doubly nodular fold in an oblique view in the 

 mouth. Inside it is strongly spiral, low, thin, with a callous nodule 

 below ; above it becomes strong and high ; not continued parallel to the 

 spiral lamella, and therefore not nearly so deeply penetrating. The 

 subcolumcllar lamella emerges. There is a nodule-like fulcrum. 

 Principal plica about a half whorl long, extending from the middle of 

 the dorsal to the middle of the ventral side. Upper palatal plica 

 small and short. Lunella very strong and high, subvcntral, slightly 

 arcuate. There is a small sutural plica. 



Length 11. 7, diam. 2.25, length of aperture 2.25 mm. 



10, " 2 mm. 



11, " 2.3 " 



Clausilium (PI. XXXIV, figs. 40, 41) strongly arcuate, deeply and 

 abruptly excised on the columellar side of the filament; wide above, 

 strongly tapering to the apex, which though narrow is rounded. The 

 palatal side is dilated near the filament. The filament is deeply 

 inserted in the middle of the penultimate whorl. 



Nase, Oshima, Osumi. Types No. 89,888, A. N. S. P., from No. 

 1,335 of Mr. Hirase's collection. 



This form is closely related to C. entospira of Tanega-shima. It is 

 a more lengthened, slenderer shell than that, with more whorls; it is 

 much thinner, and there is a weak upper palatal plica, not present in 

 the other; finally, the aperture projects farther forward. 



Section OLIGOZAPTYX Pilshry. 

 Clausilia hedleyi hyperodonta n. subsp. 



Similar to C. hcdlcyi, but it differs in having a superior lamella 

 distinctly developed. Varying in size from 

 Length 9.5, diam. 2 mm., to 



" 7.5, " 1.7 " 

 Koniya, Oshima. Types No. 90,019, A. N. S. P., from No. 1,202a 

 of Mr. Hirase's collection. 



