PHYSA. 147 
Length 25, diam. 17:5 mill. 
Lake Pipin, Ohio, original loc.; Michigan 
to Missouri. 
T agree with Mr. W. G. Binney that this is 
distinct from P. ancillaria, 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 thé 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) u 
