PHYSA. 1387 
outer lip sharp and very much expanded ; 
columella slightly thickened and twisted. 
Length 10, diam. 6°65 mill. 
Lewis’ River, Oregon. 
This species differs from all other American 
Physe in having a regularly arched outer lip. 
It approaches Say’s ancillaria, but it has not 
the shoulder, and is rather more oblique. It 
seems to be quite a different species from con- 
color, Hald., also brought by Prof. Nuttall 
from Oregon. 
13. PHYSA CONCOLOR, Haldeman. 
Monog. p. 30, t. 2, fig. 10. 
This species is doubtless identical with some 
of the other western species, but the single 
type is entirely too small for identification. 
(53) 
