HELIX. 209 



rufous bands, of which there are usually two on the body- 

 whorl ; whorls six, striated and rounded, the last whorl 

 making a considerable part of the volume of the shell ; 

 suture distinctly impressed ; aperture ample, nearly cir- 

 cular, space between the two extremities of the lip small, 

 with a thin callus ; within bluish white, showing the bands ; 

 umbilicus large and deep, exhibiting all the volutions ; 

 base destitute of bands. 



Greatest transverse diameter more than one inch and 

 a quarter. 



GEOGRAPHICAL DISTRIBUTION. 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 coarse texture, 

 deep and ample umbilicus, and the dark rufous bands on 

 its whorls ; but it is sometimes destitute of bands, and 

 nearly white. The spire varies considerably in the 

 degree of its elevation, but the apex is always obtuse. 

 The same specific name was applied by Poirct to a 

 French species, but, Draparnaud's name for the same 

 shell (//. conoidea) having universally obtained, the 

 present name can be retained for our species. 



VOL. ii. 27 



