372 PROCEEDINGS OF THE ACADEMY OF [May, 



spiral lamella. Subcolumellar lamella weakly eiuergiug. Principal 

 plica short, visible withiu the mouth, exteudiug inward past the 

 lunella. Upper palatal plica very short, connected with a rather 

 low, nearly straight, slightly dorso-lalei*al luuella, the lower end of 

 which curves abruptly inward. 



Length 10.2, diam. 2.5 mm.; whorls 7f. 



Length 8.6, diam, 2.3 mm. ; whorls 6f. 



Clausilium (PI. XIX, figs. 39, 40) parallel -sided, nearly straight, 

 rounded apically, deeply excised on the columellar side of the 

 filament. 



Yakushima, Osumi. Types Xo. 82,959, A. N. S. P., from Xo. 

 663c of Mr. Hirase's collection. 



This species resembles Zaptyx in texture and general structure, as 

 well as in the form of the clausilium, but it differs in wanting the 

 sutural plicse and the accessory lamellae of that group. It is 

 remarkable for the varnish-like gloss of the surface. 



Clausilia caloptyx n. sp. PI. XIX, figs. 45, 46, 47, 48. 



Very small, fusiform, pale corneous-brown, solid and strong, 

 rather rapidly tapering above to a rather obtuse apex. Surface 

 regularly sculptured icith strong, straight ribs, very coarse for so 

 small a shell. AVhorls 7J, convex, the last somewhat compressed, 

 with the ribs a little more separated. Aperture squarish-ovate. 

 Pei-istome white, continuous, reflexed, thickened within, very 

 shortly free above, notched at the position of the superior lamella. 

 Superior lamella marginal, compressed, subvertical, continuous with 

 the spiral lamella, which penetrates scarcely to the ventral side. 

 Inferior lamella receding, invisible in a front view, but appearing 

 as a strong, deeply placed fold in an oblique viev; in the aperture ; 

 straightly ascending withiu, not penetrating quite so deeply as the 

 spiral lamella. Subcolumellar lamella emerging. Principal plica 

 short, extending from near the lip to a lateral position. Upper 

 palatal plica very short, connected with the rather weak luuella, 

 which curves inward at its lower end, and is dorso-lateral in posi- 

 tion. Length 6.8, diam. 1.9 mm. ; whorls 7^. 



Length 7, diam. 2 mm. ; whorls 7^. 



Length 8, diam. 2.4 mm.; whorls 8 (larger form; see below). 



Clausilium (PI. XIX, figs. 45, 46) parallel-sided, the distal 

 third straightened, the rest strongly curved ; distal end slightly 



