1904.] NATURAL SCIENCES OF PHILADELPHIA. 825 



arc from Tancga-shima and Yaku-shima, but the group extends south 

 to Tokuno-shima. Type C. pinto. 



The following species belong here : 



C. pinto Pils. Tancga-shima, Osumi. 



C. ptychocyma Pils. Tancga-shima, Osumi. 



C. ptychocyma yakushimce Pils. Yakushima, Osumi. 



C. asperata Pils. Shimo-Koshikijima, Satsuma. 



C. caloptyx Pils. Yakushima, Osumi. 



C. agna Pils. Yakushima, Osumi. 



C. purissima Pils. Miyakejima, Izu. 



C. hyperaptyx Pils. Tokunoshima, Osumi. 



C. munus Pils. Oshima, Osumi. 



Key to Species of Hemizaptyx. 



I. Clausilium rounded at the distal end. 



a. Upper palatal plica extremely short or apparently absent, 



merely an enlargement of the upper end of the lunclla. 

 b. Solid and strong, nearly smooth; lip very thick, hardly 

 free above; superior lamella contiguous to the spiral; 

 subcolumellar lamella emerging. Tanegashima, 



C. pinto. 



b 1 . Extremely solid and strong; almost smooth, the last whorl 

 coarsely wrinkled behind the lip ; superior lamella sep- 

 rated from spiral ; subcolumellar lamella emerging 

 or immersed. Tanegashima and Yakushima, 



C. ptychocyma. 



b 2 . Moderately strong; very finely striate, the last whorl with 

 spaced riblets behind ; superior lamella continuous with 

 the spiral; subcolumellar lamella immersed. Shimo- 

 Koshikijima, Satsuma, C. asperata. 



a 1 . Upper palatal plica short but distinctly developed. 



6. Solid and strong; surface sculptured with strong straight 

 ribs; length 7 to 8 mm. Yakushima, . C. caloptyx. 

 b 1 . Surface smooth, brilliantly glossy; more or less transpar- 

 ent. 



c. Whorls 6f to 8 ; shell stoutly fusiform, the diameter 

 contained 3 to 4 times in the length ; subcolumellar ' 

 lamella weakly emerging. Yakujima, . C. agna. 

 c 1 . Whorls 10; shell slenderly fusiform, the diameter con- 

 tained 5 times in the length ; subcolumellar lamella 

 immersed. Miyakejima, Izu, . . C. purissima. 

 II. Clausilium angular or acuminate at the distal end; superior 

 lamella continuous with the spiral; upper palatal plica rather 

 short, scarcely connected with the slightly curved lunella. 

 a. Shell dark, glossy and rather thin, 10 to 11 mm. long; about 

 1\ whorls; sides of the clausilium strongly reflexed. 



Tokunoshima, C. hyperaptyx. 



53 



