321 



T. with five pellucid, fmooth, glolTy, reddifii-brown 

 volutions, rounded, and divided by a fine feparating line : 

 apex pointed: aperture fi.ib-orbictilar, a little reflefted 

 on the pillar. Length one eighth of an inch, or more ; 

 breadth nearly one third its length. 



We found this fpecies at Whitfand bay in Cornzoall, 

 and with it a (hell in every refpeft like, but in colour, 

 which is perfeftly white, and fo tranfparent that the 

 whole of the Columella may be feen through the fliell. 



31. 

 T. with a thin, pellucid, white, fmooth, fub-cylindric Vitreus, 

 fhell, with four very rounded volutions, feparated by a Tab. 12. f. 3, 

 deep deprefled line : apex rather obtufe : aperture fub- 

 oval, contrafted at the upper end ; outer lip thin ; inner 

 lip a little thickened. Length one eighth of an inch; 

 breadth one third its length. 



This fpecies muft not be confounded for the white va- 

 riety of the laft defcribed ; it is more flender, the volu- 

 tions are ftronger, and run fingularly more oblique; 

 and is at once diftinguifhed by its fub-cylindric fliape, in 

 which it refembles more the T.Jlriatus ; but differs from 

 that (liell in being perfeftly fmooth, and in not having a 

 marginated aperture. 



The Columella of this fpecies is vifible through the 

 fhell. 



T t We 



