I20 OTHER SINISTRAL SHELLS. 



shell, which somewhat resembles a ven- small grain 

 of wheat. From Santa Barbara, California. 



Quite resembling the Physas, but with a longer 

 spire, comes Btilimis hypnorum^ Linn., Bii'-li-nus 

 hyp-no'-rum. Fig. io8. The minute apex is 

 rounded, the sutures distinct and oblique, the 

 whorls six or seven in number, and the aper- 

 ture of moderate size. The color is light 

 brown, and the surface is very smooth and 

 glossy. The length is three-fourths of an 

 Fig. io8. inch. The specimen illustrated came from 

 Box Elder county, Utah. 



Physella Cohi7nbiana^ Hemphill, Fi-sel'-la Co-lum- 

 bi-an'-a, is the last in this instructive group. It has 

 a pretty little sinistral shell, consisting of a short 

 spire and a very round and full body whorl, with an 

 ample aperture. It is of a brown color, but the 

 curved columella is often white. Its length is half 

 an inch, and it lives, as its name indicates, in the 

 Columbia river. 



