inhabiting the United States. 427 
Synonyms AND Rerenencrs 
Helix ngiti Say. Journ. A. N. S. Philad., 
II. 157. 
DESCRIPTION. 
Animal. Dirty white, with a rufous tinge; ru- 
fous spots on the head and neck, lighter ones along 
the margin. 'l'entacule dark; foot short, potter 
extremity rounded. 
Shell. Very convex, thick, apex obtuse; epider- 
mis dark corneous, with brown, or rufous 
bands, of which there are usually two on the body- 
whorl ; whorls six, striated and rounded, the last 
whorl aio a considerable part of the. volume of 
the shell ; suture distinetly impressed ; aperture am- 
ple, HT space between the two extremities of 
the lip small, with a thin callus, within bluish white, 
showing the bands; umbilicus large and deep, ex- 
hibiting all the séldtións ; base destitute of bands. 
Greatest transverse diameter more than one inch 
and a quarter. 
iw. 
-GgocRaPHICAL DisrnriBUTION. Inhabits the West- . 
ern States north of the Ohio river. It was noticed 
by Mr. Say in lower Missouri. 
Remarks. This is a thick and coarse shell when 
fully grown: It is distinguished by its deep and 
ample umbilicus, and the dark rufous bands on its 
whorls. ‘The spire varies considerably in the degree 
of its elevation, but the apex is always obtuse. The 
same specific name was applied by Poiret* to a 
* cs Prodrome 4 cr “11 a t] ua + +, emt » &c 
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