65 



that these transverse elevations are not wholly 

 obliterated by the removal of the epidermis. 

 Draparnaud supposes that they are the vestiges of 

 former peritremata or margins of the aperture. 



50. HELIX brevipes. Shell flattish, oblong, ex- 

 tremely thin, transparent and glossy, brownish- 

 white when fresh : aperture vast, oval, and some- 

 what oblique : umbilicus deep. 



Helix brevipes. Drap. p. 119. t. S.f. 3033. 



Shell hardly the tenth of an inch in diameter, and 

 may easily be mistaken for the young of Vitrina> 

 but is distinguished by the following marks: 

 1. the animal is not so comparatively large, but is 

 wholly contained in the shell: 2. the shell is per- 

 fectly formed, and furnished with a regular central 

 umbilicus, is of a thicker consistence and of a 

 whitish colour when dead. Draparnaud properly 

 observes, that this and another similar species 

 which he denominates Helix rufa, and which we 

 have not yet discovered, form the natural boundary 

 between the Helix and the Vitrina. 



In woods and among leaves. 



