420 PKOCEEDINGS OF THE ACADEMY OF [July, 



like, from having the lateral edges of the tapering portion abruptly 

 bent toward the convex side of the clausilium. The palatal 

 margin is especially widely reflexed and flattened. 



Clausilia ptychochila Boettger. PI. XXIII, figs. 40, 41, 42. 



Clausilienstudien, p. 66 (1877); Jahrb. d. D. Malak. Ges., V, p. 57, PL 

 3, fig. 8 (1878). 



The habitat of this species is unknown. It was described from 

 a single specimen, supposed to be from China, but without record 

 of locality. From its characters I think it will be found on 

 Okinawa or some neighboring island. 



The type measures, length 24J, diam. 6J, length of aperture 6^., 

 width 4J mm. ,It is swollen-fusiform, densely costulate and 

 whitish-corneous, the spire concavely attenuated. Whorls 11. 

 The aperture is rhombic -piriform, peristome much thickened, sin- 

 uate and appressed above. There is a groove separating the 

 superior lamella from the numerous folds which corrugate the 

 interlamellar space. The inferior lamella is callous below. " The 

 small upper and the longer lower palatal plicae are united with 

 the short, straight lunella, which at its base gives off a distinct 

 branch backward." The clausilium has not been described. 



Boettger' s description and figures show this to be a species closely 

 related to C. crenilabium and C. Bernardii. It differs from the 

 former in being more inflated, with the lunella apparently straight, 

 not curving inward above, and nothing is said to indicate that 

 the lower palatal plica has the great height at its junction with the 

 lunella and the strong development seen in C. crenilabium. It is 

 apparently more finely sculptured than C. Bernardii. Further 

 collections are needed to determine whether these three species are 

 constantly distinct or united by intermediate examples. Num- 

 bers of specimens of C. Bernardii and C. crenilabium show no 

 tendency toward intergradation, and with present knowledge I 

 would not feel justified in uniting the three species. 



Dr. von Mollendorff has placed ptychochila in the synonomy of 

 excellens (Jahrb. D. Mai. Ges., X, p. 269). This union is inadmis- 

 sible. 

 Clausilia crenilabium n. sp. PI. XXIII, figs. 23, 24, 25, 33. 



Shell thick and strong, brownish buff, rimate, turreted, attenu- 

 ated above, moderately swollen below, the last whorl contracted, 

 penultimate whorl widest. Whorls about 11J, slightly convex, 



