1908.] NATURAL SCIENCES OF PHILADELPHIA. 575 



Length 18.5, di am. 3.7 mm. 

 17.0, " 3.8 " 



The clausiliiim (figs, la, c) is narrow and tapers rather strongly 

 toward the rounded apex, the palatal margin being decidedly convex. 

 It is excised on the columellar side of the filament, and is rather 

 strongly curved throughout. 



Oetakayama, Iwami. Types No. 95705 A. N. S. P., from No. 1600 

 of Mr. Hirase's collection. 



Only six specimens of this handsome Hemiphccdnsa were taken. 

 In coloration it resembles C. holotrema. No other Japanese Hemi- 

 phcedusa is similarly colored. The separation of the upper palatal plica 

 from the lunella and the shape of the clausilium are further distinguish- 

 ing features. 



Section HBMIZAPTYX Pilsbry. 

 Clausilia ptychocyma Pils. 



In specimens from Kuroshima the subcolumellar lamella emerges 

 on the lip but is rather weak, and the spiral and inferior lamellae are 

 longer than in the types, running inward to a point above the termi- 

 nation of the outer lip. They measure 11.2 to 12.5 mm. 

 Clausilia agna spicata n. subsp. PI. XXXI, figs. 12, 13. 



The shell resembles C. agna in its smooth surface and translucent 

 texture, and in having the subcolumellar lamella weakly emerging, or 

 at least visible in an oblique view in the mouth; but it differs by being 

 longer and more slender, similar in shape to C. purissima. It may be 

 either clear greenish-corneous (like C. purissima), chestnut brown, 

 or very pale brown. C. agna spicata differs from C. purissima by its 

 emerging subcolumellar lamella. The shell is also stronger when adult. 



Length 12.0, diam. 2.3 mm.; whorls 9^ ^ 

 12.2, " 2.7 " '' 9i I 



u jQ y (( 2 2 " " 8- Akuseki. 



9.7^ " 2.0 " " 8iJ 



11.0, " 2.3 " " 9 



q o u 2 3 " " 71 \ K^ichinoerabu. 



Akusekijima, Osumi. Types No. 95709 A. N. S. P., from No. 663e 

 of Mr. Hirase's collection. Also taken at Kuchinoerabushima, Osumi. 

 No. 90023 A. N. S. P., from No. 663rf of Mr. Hirase's collection. 



This race stands between C. agna, described from Yaku-shima, and 

 C. purissima, from Miyake-jima, Izu, and shows that these two species, 

 widely separated geographically, are in reality very closely related. 

 The Miyake-jima form has a very deeply immersed subcolumellar 



