PHYSA. • 147 



Length 25, diam. 17'5 mill. 



Lake Pipin, Ohio, original loc. ; Michigan 

 to Missouri. 



I agree with Mr. W. G. Binney that this is 

 distinct from P. cmcillaria, with which it has 

 been confounded by Haldeman. It is more 

 regularly oval, without shoulder, smoother, 

 and more polished and translucent. Tappan's 

 description and figure seem to have been ne- 

 glected by all recent students, and the species, 

 although so perfectly distinct and of such nu- 

 merous occurrence in the north-western States, 

 has been confounded with ancillaria. To Dr. 

 Lea belongs the honor of re-discovery, but his 

 specific name must yield to the prior one given 

 by Tappan. 



25. PHYSA VINOSA, Gould. 



Plate 8, fig. 3. 



Shell thin, ovate-globose, red, spire very 

 short, obtuse ; whorls four, the last very much 

 inflated ; aperture broadly ovate-lunate, three- 



(63) 11 



