636 PROCEEDINGS OF THE ACADEMY OF [Dec. , 



subcolumellar lamella and sharper, higher crest behind the outer 

 lip. C. oxycyma scarcely differs from tanegashimce externally 

 except in its smaller size, but it has a well developed upper palatal 

 plica, which is represented in tanegashimce by only a short inward 

 bend of the lunella. The palatal margin of the clausilium is 

 straight in C. tanegashimce. 



Specimens from Yaku-shima agree with those of Tane-ga-shima 

 in solidity and size. The lunella is low above and its inward bend 

 above, though low, is rather pliciform. I did not receive these 

 specimens until recently, or I would have named the species 

 differently, since it proves to extend beyond Tane-ga-shima. 



Group of C. mikado. 



This group is well developed in the provinces about the upper 

 (eastern) end of the Inland Sea. Probably C. plicilabris A. 

 Ad. , described from Tanabe, Kii, will prove to belong here, near 

 C. aurantiaca and the following species. I formerly thought it 

 might be identical with C. lilabrata Smith. 



Clausilia orthatracta n. sp. PL XXXVII, figs. 44, 45, 46. 



Shell rimate, slenderly and straightly fusiform, rather solid, of 

 a pale brown tint. Surface lusterless, finely striate, the striae per- 

 ceptibly coarser, though still fine and close, on the latter part of 

 the last whorl. The upper whorls are almost smooth from wear in 

 the specimens seen. Spire nearly straight-sided, attenuated and 

 nearly cylindric above, the apex rather large. Whorls 12, the 

 earlier convex, the later ones flattened, last whorl compressed later- 

 ally, noticeably constricted behind the lip, especially near and at 

 the base; and there is generally a stronger riblet where the expan- 

 sion of the lip begins (fig. 45). Aperture oblique, retracted at 

 the base and sinulus, piriform and small. The peristome is con- 

 tinuous and stands forward free from the preceding whorl; is white, 

 thickened, expanded and reflexed, weakly emarginate at the posi- 

 tion of the superior lamella or not noticeably so. Superior lamella 

 marginal, oblique, continuous with the spiral lamella, which is low 

 at first, but rises high in the region of the closing apparatus, and 

 penetrates inward past the aperture to a lateral position on the 

 left side. The inferior lamella recedes deeply, though the lower 

 end continues to the lip-edge. It is straightened within, and pene- 



