820 PROCEEDINGS OF THE ACADEMY OF [DeC. ; 



Section OOPH^EDUSA nov. 



The clausilium is well curved, spatulate, with a thick rib near the 

 columellar side of the distal half, continued and projecting finger-like at 

 the apex; proximally it tapers into the filament, and is not emarginate. 



The shell is short, oblong, of few whorls (6-6J in the species known), 

 the summit very obtuse, entire. Superior continuous with the spiral 

 lamella. Inferior lamella strongly spiral within, bifid below. Upper 

 and lower palatal plicae long, the latter united with an oblique lunella. 



The only species now known has a crenulate lip, like Luchuphcedusa, 

 and the palatal armature and clausilium are similar in the two groups ; 

 but in Luchuphcedusa the shell is shaped like ordinary Clausilias, while 

 hi Oophcedusa the thick-set shell is not in the least attenuate above, 

 being shaped like a snake's egg, and there are but few whorls. 



Clausilia ophidoon n. sp. PI. LII, figs. 1, 2, 3. 



Shell oblong, fusiform with blunt ends, the penultimate whorl widest; 

 moderately strong; brown; finely striate throughout except the first 

 whorl, which is whitish and smooth; somewhat shining. Whorls 6, 

 the first rather large, not projecting, forming a large, very obtuse apex; 

 last whorl tapering. Aperture slightly oblique, piriform, the peristome 

 white, re flexed, thickened within, the columellar and parietal margins 

 closely and strongly folded, the edge crenulate. Superior lamella thin 

 and high, marginal, continuous with the spiral lamella, which pene- 

 trates past the aperture to the left side. Inferior lamella emerging to 

 the lip-edge, spirally ascending within, and penetrating about as far 

 as the superior lamella; below it branches off in a columellar lamella 

 which also emerges to the lip-edge. Subcolumellar lamella emerging. 

 Principal plica extending from the middle of the dorsal side to a point 

 above the sinulus, visible through from the outside. Upper palatal 

 plica latero- ventral, long, converging inward toward the principal 

 plica. Lower palatal plica very long and very oblique, united with a 

 very oblique lunella, nearly parallel with the plica. 



Length 14.4, diam. 5 mm. 



Length 13, diam. 4.5 mm. 



Clausilium (PL LIII, figs. 15, 16) strongly curved, spatulate, the 

 palatal margin strongly arcuate. A callous rib arises about midway 

 of the columellar margin, and projects in a finger-like process at the 

 apex. 



Shimo-Koshikijima, Satsuma. Types No. 87,602, A. N. S. P., from 

 No. 1,235 of Mr. Hirase's collection. 



This remarkable species has no near allies among known Clausilise. 



