98 HELICID^E. 



from it in the following particulars : It is much more 

 globose, of a coarser and more solid texture, and the 

 striae of increase are much more raised and prominent, 

 so much so, indeed, as to leave distinct grooves between 

 them. The revolving striee, so distinct on that shell, 

 are either wanting or very indistinct. The aperture is 

 smaller in proportion to the size of the shell, less flat- 

 tened towards the plane of the base, and more rounded. 

 The pillar lip and umbilicus are in many instances cov- 

 ered with a smooth and shining, semi-transparent, testa- 

 ceous callus. The margin of the lip is thickened, the 

 lip itself is narrower, less abruptly reflected, and not so 

 much flattened, and there is often a tooth-like process on 

 the inner and upper side of the margin near the umbil- 

 icus. The color of the epidermis is generally much 

 darker. The only considerable variation in the charac- 

 ters of the shell is caused by the depression of the spire 

 in some individuals, and indeed in all specimens from 

 certain localities. In its most perfect condition it is 

 often sub-conical. It is subject to some irregularities in 

 the form of the mouth, and there is sometimes an indi- 

 cation of pale bands in the epidermis of the body whorl. 



In those parts of the Eastern and Middle States where 

 Helix allolabris abounds, it is in general but about half 

 the size of this species, and is altogether a more delicate 

 and beautiful shell. That this is not the same species, 

 increased in size by the influence of a warmer climate, 

 would seem to be proved by the fact that other species 

 are not larger in Florida than in situations further north, 



