1901.] NATURAL SCIENCES OF PHILADELPHIA. 



ing respects: The surface is more coarsely striate; the last whorl 

 does not have a convex belt above the position of the principal 

 plica, and has more of a swelling on its latter portion; the spire 

 has one more whorl. It remains to be seen whether intergrades 

 exist between this species from Shikoku and subaurantiaca from 

 the Province of Nagato in western Nippon. They are certainly 

 closely related. 



Group of C. Pinto. 



Small, solid Hemiphcedusce with the clausilium unusually straight 

 and flat, rounded or a little tapering at the apex, abruptly bent 

 near the filament and emarginale or excised on the columellar side 

 thereof. Superior lamella contiguous to or separated from the 

 spiral lamella, which is short, barely reaching the ventral side. 

 Inferior lamella deeply receding, straightened and strong inside. 



This group has some affinity to Zaptyx in both shell and claus- 

 ilium, but it has not the accessory lamellae and plicae of that sec- 

 tion. It is not closely related to other Hemiphsedusan groups. 



Two species, from the islands Tane-ga-shima and Yaku-shima, 

 are known : C. Pinto, in which the last whorl is normal, and C. 

 ptychocyma, which has a wave or crest and several strong wrinkles 

 behind the outer lip. 

 Clausilia Pinto Pilsbry. PI. XXXV, figs. 12, 13, 14. 



Pilsbry, these Proceeding?, Vol. LIII, p. 501 (October 2, 1901). 



Shell very small, fusiform, solid and strong, flesh-colored, 

 weakly marked with slight growth-wrinkles, eroded in irregular 

 spots. Spire regularly tapering to a rather small apex. Whorls 

 about 8, the last without crest or other conspicuous sculpture 

 behind the lip. Aperture small, squarish-ovate, the lip somewhat 

 reflexed, very thick, white, hardly free above. Superior lamella 

 marginal, contiguous to the spiral lamella, which penetrates barely 

 to the ventral side. Inferior lamella very deeply receding, high 

 and stout within the last whorl, subvertically ascending, a trifle 

 sinuous, extending inward as far as the spiral lamella. Subcolu- 

 mellar lamella emerging. Principal plica less than a half whorl 

 long, extending shortly beyond the lunella. Lunella lateral, 

 straight and joining a short upper palatal plica above, curving well 

 inward and ending in a slight nodule below. 



Length 9.5, diam. 2.6 mm. 



Length 8.5, diam. 2.3 mm. 



