102 



HELICIDiE. 



the shell has attained its full size that the reflected lip is 

 added, and the umbilicus is covered. It resembles He- 

 lix tliyroidus, Helix exoleta, and Helix major, but is dis- 

 tinguished from the former by its greater size, covered 

 umbilicus, and want of the tooth-like process on the pillar 

 lip, and from H. exoleta by the absence of the tooth, and 

 its less ventricose form. The differences between it and 

 H. major are pointed out in the remarks on that species. 



Lister's figure, (tab. 47, f. 45,) referred to by F^russac 

 and others as representing this shell, is very unhke it. 

 The spire is too much produced, and the last whorl too 

 voluminous. It would not have been conjectured to be 

 this species, were it not that the locahty is indicated by 

 the word virginiana engraved upon the plate. 



