228 



HELICID^. 



lower part reacMng to the centre of the base ; umbilicus 

 small ; base rather flattened, indented in the centre. 

 Greatest diameter less than three-fourths of an inch. 



Geographical Distribution. Inhabits the North- 

 ern, North-eastern, and Western States, and is doubtless 

 widely dispersed. 



Remarks. This shell bears some resemblance to the 

 two preceding, with which it has been confounded ; it is, 

 however, oftener taken to be Helix glaphyra of Say, by 

 the naturahsts of the West, where the latter, being an 

 introduced species, common only near the sea-shore in 

 cellars and gardens, is not found. Though resembling 

 Helix fuliginosa in general appearance, it may be dis- 

 tinguished by the number of whorls, which are five, 

 but which in that species, in specimens twice as large, 

 but httle exceed four. Its aperture is much less circular, 

 the transverse diameter being considerably the greatest ; 

 the umbilicus is smaller, being nearly closed, and more 

 profound ; the volume of the last whorl is less, in propor- 

 tion to the size of the shell ; the base is flatter, the color 

 lighter, without the smoky tinge of the former species. 



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