1903.1 NATURAL SCIENCES OF PHILADELPHIA. 315 



ADDITIONS TO THE JAPANESE LAND SNAIL FAUNA-No. VIII. 

 BY HENRY A. PILSBRY. 



Several new forms of Clausilia have been detected by Mr. Hirase 

 since the pubhcation of No. VII of this series.^ They are chiefly from 

 Shikoku Island, and all belong to groups already well represented in 

 the same regions. A single species herein described from Sado is the 

 first Clausilia to be made known from that island. 



Section HEMIPHiEDUSA Bttg. 

 {Group of C. awajiensis.) 

 Clausilia sadoensis n. sp. Pi. XIV, figs. 6, 7, 8, 9, 10. 



Shell slender, attenuate above, brown. Surface somewhat glossy, 

 finely striate, paler and smoother above, hardly more coarsely striate 

 on the last whorl. Whorls 10^ to 11, convex, the last compressed 

 laterally, and having a rounded ridge or varix behind the basal and 

 outer lips. Aperture small; peristome white, reflexed, continuous, 

 the parietal margin erect and free. Superior lamella compressed, 

 marginal, continuous with the spiral lamella or interrupted. Spiral 

 lamella short, not quite reaching the middle of the ventral side. In- 

 ferior lamella deeply receding, straightened within, as long as the spiral 

 lamella. Subcolumella lamellar emerging but w^eak. Principal phca 

 short, latero-dorsal. Upper palatal plica short, in the middle joined 

 to the long, nearly straight lunella, which curves inward slightly 

 toward the lower end. 



Length 15.5 to 16, diam. 3.5 mm. 



Length 14, diam. 3.5 mm. 



Clausilium long, parallel-sided, rounded apically, deeply excised on 

 the columellar side of the filament (figs. 8, 9). 



Misakimura, Sado. Types No. 84,394, A. N. S. P., from No. 993 of 

 Mr. Hirase's collection. 



Closely related to C. ischna, especially to the variation of that species 

 which I called var. neptis, but C. sadoensis differs in the stronger ridge 

 behind the hp (barely indicated or not perceptible in C. ischna), and 

 in having the spiral and inferior lamellae of equal length inside, while in 



1 These Proceedings for 1902, pp. 517-533. 



