63 



deeply divided volutions, which very gradually 

 decrease from the tumid and rounded base, the 

 tip obtuse and usually of a whitish colour : aper- 

 ture narrow crescent-shaped, wider than long, the 

 margin thin and reflected over the umbilicus which 

 is small and deep. 



Like that of the H. spinulosa, the epidermis of this 

 species rises into thin laminar foliations, which in 

 various positions of light reflect a velvety or 

 satin-like lustre ; but the foliations are infinitely 

 more numerous and compact, not shooting into 

 spinous processes in the middle : the shape of the 

 spire is also very different, not decreasing in a 

 conical manner, but regularly pyramidal ; and the 

 aperture, instead of projecting forward in a semi- 

 elliptic form, is narrow crescent- shaped, without 

 the internal rib round the margin. 



For this extremely beautiful and interesting acquisi- 

 tion, we are indebted to the diligence of Mr. 

 Bean of Scarborough, who first discovered it in 

 the woods near that place. 



49. Helix, pule he Ha. Shell opake-white or brown- 

 ish, depressed, equally convex both .sides : aper- 

 ture nearly circular with the margin flat and 

 reflected. 



