1879.] NATURAL SCIENCES OF PHILADELPHIA. 23 



times slightly flattened near the peristome; aperture oblique, 

 oblong, in adults about a third the length of the shell ; parietal 

 region with a thin, prominent lamina, which runs nearly parallel 

 wilh the suture; peristome straight, acute, with the margins re- 

 mote; columella tortuous, the lower margin armed with a thin, 

 acute, slightly oblique fold ; the palate frequently with one or two 

 spiral rows of small compressed denticles. 



Length 3, major diameter 1^ mill. 



A thin transparent species, with a more tapering spire than 

 oblonga, with the twisted columella of conica, but readily distin- 

 guished from either by the acute plication in the columella, which 

 can only be distinctly seen when looking obliquely into the aper- 

 ture. Owing to the transparency of the shell, the sutural line 

 appears to be narrow!}^ margined. The palatal denticles, though 

 sometimes wanting, were overlooked by Mr. Pease. 



It is worthy of remark that the above author in his list of Pau- 

 motus shells received from me, and published in the French 

 Journal of Conchology lor 1 811, refers the S. E. Polynesia spe- 

 cies to his nitida. 



Tornatellina affinis, ?p. nov. 



Shell small, imperforate, ovate-conic, thin, smooth, shining, 

 transparent, light brownish-horn color; spire oblong-conic, with 

 planulate outlines ; apex obtusely rounded ; suture narrowly mar- 

 gined ; whorls six, plano-convex, slowly and regularly increasing, 

 the last not deflected in front, rather large; aperture oblique, 

 irregularl}' abbreviate ovate, a little more than a third the length 

 of the shell; parietal wall with a strongly compressed prominent 

 lamina; peristome acute, straight, regularly curved, margins re- 

 mote; columella tortuous, not plicate or dentate. 



Length 2|, major diameter 1^ mill. 



This species, which we have ventured to record as new, is shaped 

 very much like Philippi, but the whorls of the spire are flattened, 

 and the bod}" is not so turgid as in that species. The columella 

 has the peculiar twist of conica, but our shell is smoother, more 

 shining, the spire more tapering, and the whorls much more 

 depressed. 

 Tornatellina micans, sp. nov. 



Shell small, imperforate, ovate-conic, transparent, thin, polished, 

 faintly striate under the lens, pale brownish-horn color; spire sub- 



