506 PROCEEDINGS OF THE ACADEMY OF [DeC, 



Clausilia longiplicata ri. sp. Pl. XXXIII, figs. 25-29. 



Shell cylindric-fusiform, strong, light yellowish brown, sul)trans- 

 parent except when old, when it becomes opaque. Surjace very 

 smooth and glossy, as if varnished, marked with faint growth-lines only. 

 Whorls 8^, moderately convex, the last a little compressed laterally, 

 pinched into a short low and rounded basal crest. Aperture rhombic- 

 ovate, the white peristome a little expanded and narrowly reflexCd, 

 thickened in old shells. Superior lamella high and compressed, continu- 

 ous with the spiral lamella which is also exceptionally high, and con- 

 tinues inward to a point above the sinulus. Inferior lamella receding, 

 low but strong and callous within, at first vertically ascending, then 

 abruptly bent to the left, after which it ascends vertically again, 

 abruptly becoming low on the ventral side, and much shorter there 

 than the spiral lamella. Subcolumellar lamella very slender, emerging 

 to the lip-edge, bounded by grooves. Principal plica dorsal and 

 lateral, extending nearly to the lip. Upper palatal plica ver-y long, 

 parallel to the principal plica on the side, but diverging from it on the 

 back, where it approaches the lip, and is seen conspicuously in the 

 mouth. Lunella lateral, very oblique, slightly arcuate, tapering 

 towards the ends, not reaching the upper palatal plica, or but weakly 

 joining it. There is no lower palatal plica. Sutural plica^ and fulcrum 

 are absent. 



Length 11, diam. 2.9 mm. 

 '' 10, " 2.3 " 

 '' 10, " 2.6 '' 



The clausilium (PI. XXXIII, figs. 25, 26) is very short, spatulate, 

 being broad and rounded distally. It is excised near the filament as 

 usual in Zaptychoid clausilice; near the distal end it bulges inward, and 

 has a corresponding concavity on the outer face. It is somewhat 

 calloused along the palatal margin. 



Keraraa-jima, Ryukyu. Types No. 89,892, A. N. S. P., from No. 

 1,361 of Mr. Hirase's collection. 



This peculiar snail resembles C. agna in its general form and brilliant 

 gloss, but differs widely in internal structure. The long upper palatal 

 plica reminds one of C. dolichoptyx, but that species is in everything 

 else a true Zaptyx. The long upper palatal plica and short lunella 

 suggest Dicerotoptyx, which, however, differs by the shape of the 

 inferior lamella, the different clausilium, etc. C. uraniscoptyx of For- 

 mosa differs from longiplicata by its ascending last whorl {longipli- 

 catus, long-folded, in allusion to the long upper palatal plica). 



