132 PHTSA. 



Viewed from the right side, the form of shell 

 and columella forcibly remind one of Limnea 

 emo.rginata, Say. 



7. PHYSA PROPINQUA, Tryo7i. 



Plate 6, fig. 13. 



Shell large, fragile, inflated ; spire short, 

 apex acute ; body whorl almost shouldered, 

 very large, covered with distinctly elevated 

 lines of growth on the adult specimens ; the 

 surface frequently exhibits several planes, in- 

 stead of being uniformly rounded ; aperture 

 large, oval, outer lip regularly rounded ; colu- 

 mella a little twisted. 



Length 19, diam. 13 mill. 



Jordan Creek, S. W. Idaho. 



This species has a shorter spire, its sutures 

 are not well impressed, it has fewer whorls, is 

 more ventricose, more solid, and is a smaller 

 shell than Ph. ampullacea, Gould. Pit. Lordi, 

 Baird, is still more ventricosely inflated, and 

 the columella is not twisted, 



■:48) 



