156 PHYSA. 



35. PHYSA ANATINA/Zm. 



Plate 9, fig. 3. 



Shell subfusiforin, somewhat inllated, trans- 

 parent, thin, whitish ; spire exsertecl, pointed ; 

 sutures verj much impressed ; whorls six, 

 somewhat convex, the last one large ; aperture 

 rather small and somewhat constricted ; outer 

 lij) a little expanded, thickened and saffron- 

 color under the margin ; columella impressed 

 in the middle and twisted. 



Length 12, diam. 6 mill. 



Northern Tributary of the Arkansas River, 

 Kansas. 



A pretty species, Ijut having no very 

 marked characters to distinguish it from 

 several of its allies. 



36. PHYSA HALEI, Lea. 



Plate 8, fig. 14. 



Shell broadly oval, inflated, semi-transpa- 

 rent, thin, whitish ; spire obtuse ; sutures im- 



(72) 



