1904.] NATURAL SCIENCES OP PHILADELPHIA. 833 



Length 10.3, diam. 2.3 mm. ; whorls 9. 



Length 9, diam. 2 mm. ; whorls 8. 



Miyakojima. Types No. 87,638, A. N. S. P., from No. 1,301 of 

 Mr. Hu'ase's collection. 



As the differences between these specimens and those from Tarama- 

 jima, though slight, are constant, I have thought it best to signalize 

 them by a name. 



Claasilia dsemonorum Pila. PI. LVII. figs. 98, 99. 

 Proc. A. N. S. Phila., 1902, p. 381. 



Having onlyj fossil specimens without the clausilium, I described 

 this species originally as a Stereophcedusa. Recent discoveries by Mr. 

 Hirase have now made it clear that there exists a group of species 

 closely related to Zaptyx, in which the inferior lamella is spiral within. 

 The types of C. dcemonorum show, now that they are more per- 

 fectly cleaned, two sutural plicce, which I did not see when originally 

 describing the species. 



C. dcemonorum differs from C. kikaiensis in the more swollen, sack- 

 like base, larger superior lamella and the less immersed, spirally ascend- 

 ing inferior lamella. 



The species is apparently extinct in the type locality, Kikaiga-shima, 

 a small, low island which has been pretty thoroughly examined for 

 land shells; but a closely related living form has been sent from 

 Tokunoshima. 



The figures are drawn to a smaller scale than the others on the same 

 plate. 



C. dsemonorum viva n. subsp. PI. LVII, figs. 89, 90, 91, 92. 



Shell cylindric below, tapering from the penultimate whorl to the 

 apex, pale yellow or brownish-yellow, more or less transparent; thin. 

 Surface glossy, with low wrinkles of growth, and behind the lip some 

 stronger striae. Whorls 8^, those of the spire quite convex, the last 

 two somewhat flattened; last whorl compressed laterally, very convex 

 mid sack-like below. Aperture trapezoidal-ovate, the sinulus a little 

 retracted; lip thin, expanded and narrowly reflexed, white. Superior 

 lamella marginal, small, vertical and compressed, continuous with the 

 spiral lamella which is low and delicate. Inferior lamella receding, 

 forming a high compressed fold and approaching the superior lamella 

 in the throat; within the back of the last whorl it is dilated and ascends 

 in a broadly spiral curve. It is short within, and does not run parallel 

 to the spiral lamella. The subcolumellar lamella emerges. The ful- 

 crum and parallel lamella are very small. The principal plica is about 



