1902.] NATURAL SCIENCES OF PHILADELPHIA. 367 



tapering at the apex, deeply excised on the columellar side of the 

 filament. 



Jo, Kii. Types No. 82,476, A. N. S. P., from No. 770c of 

 Mr. Hirase's collection. Also Yamaguchi, Tajima. 



This form differs from C. caryostoma chiefly in being smaller, less 

 coarsely stria! e and more slender, with a larger aperture. Named 

 for Dr. John C. Jay, author of one of the earliest papers on 

 Japanese shells. 



Clausilia gracise Pilsbry. PI. XVII, figs. 7, 8, 9, 10, 11. 



Shell very small, slenderly fusiform, pale brown, finely striate, a 

 little more coarsely so on the back of the last whorl. Upper half 

 strongly attenuated, penultimate whorl somewhat swollen, latter 

 half of the last whorl compressed and tapering, the position of the 

 principal plica marked by a shallow but distinct sulcus. Whorls 9, 

 the first rather globose, the rest moderately convex. Aperture 

 slightly oblique, ovate-piriform, the peristome continuous, shortly 

 free above, reflexed, and strongly thickened within. Superior 

 lamella small and vertical, continuous with the spiral lamella, which 

 ascends past the middle of the ventral margin. Inferior lamella 

 receding, inconspicuous in a front view, but seen to form a distinct 

 fold when viewed obliquely in the aperture; straightly and 

 obliquely ascending within, penetrating as far as the spiral lamella. 

 Subcolumellar lamella deeply immersed. Principal plica long and 

 strong, extending from a latero-ventral position nearly to the lip. 

 There are two long, strong and oblique lateral palatal plicce, with a 

 strong, short lunella between them, not connected with either. 



Length 9.3, diam. 2.2 mm. 



Length 7.7, diam. 2 mm. 



The clausilium is narrow and parallel -sided, tapering at the 

 distal end, and abruptly, deeply excised on the columellar side of 

 the filament (figs. 7, 8). 



Nachi, Kii. Types No. 82,458, A. N. S. P., from No. 794 of 

 Mr. Hirase's collection. 



This species shares with C. hirasei and C. eulwlostoma the dis- 

 tinction of being one of the smallest known from Japan. It is not 

 closely related to any of the described forms, standing nearer (7. 

 aulacophora, C. pigra and C. tosana than to other species now 

 known. It is much smaller than C. caryostoma or the variety jayi. 



