828 PROCEEDINGS OF THE ACADEMY OF [Dec., 



This species closely resembles C. hyper optyx in color and sculpture, 

 but is somewhat more obese, with more acute apex, and it is quite 

 different in internal structure and in the shape of the clausilium. It 

 is not closely related to any other species now known. 



The clausilium resembles that of C. munus in shape, except that in 

 munus it is flat, not rolled back on the two sides. 



Section ZAPTYX Pilsbry, s.str. 

 Proc. A. N. S. Phila., 1900, p. 672. 



To the definition of this group may be added : Inferior lamella but 

 slightly curved and obliquely ascending within the last whorl ; superior 

 and spiral lamellae sometimes continuous; end of the clausilium 

 rounded. 



The following species belong to this group : 



C. hirasei Pils. Kagoshima and Sakura Island, Satsuma. 



C. kikaiensis Pils. Kikaiga-shima, of the Oshima group. 



C. sarissa Pils. Okinoerabu-shima, of the Oshima group. 



C. hyperoptyx Pils. Ryukyu. 



C. hyperoptyx yoronjimana Pils. Yoronjima. 



C. yaeyamensis Pils. Yaeyama. 



It is likely that C. strictaluna Bttg., of Kyushu, a species I have not 

 seen, will prove to belong to Zaptyx; but the clausilium is still unknown. 



Clausilia hirasei Pils. PI. LVI, figs. 64, 65, 66, 67. 

 Acad. Nat. Sci. Phila., 1900, pp. 446, 673. 



The original figure was in outline, and new ones are now given for 

 comparison with the other species herein described. 



The clausilium (figs. 66, 67) is more dilated on the palatal side of 

 the filament than in C. hyperoptyx, C. sarissa, or other related species. 



The types were from Kagoshima, Satsuma. The specimens now 

 illustrated are from Sakura Island, in Kagoshima Bay. It is not 

 known from any other localities. 



Clausilia kikaiensis n. sp. PI. LVI, figs. 68, 69, 70, 71. 



C. hirasei, a more slender form, etc., from Kikai, Pilsbry, Proc. A. N. S. Phila., 

 1901, p. 465. 



C. hirasei var. kikaiensis Pils., Proc. A. N. S. Phila., 1901, p. 651 (no descrip- 

 tion). 



Shell small, slender, fusiform, tapering from the penultimate whorl 

 to the small but obtuse apex, near which it is slightly attenuated. 

 Chestnut-brown of varying shades, the last whorl often darker. Sur- 

 face glossy, faintly striate, nearly smooth, the back of the last whorl 

 striate, the striae usually widely spaced. Whorls about 8. Aperture 



