BYTHINELLA. 49 
at the beaks very obtuse; sutures impressed ; 
whorls four, convex; aperture small, nearly 
round.” 
Alt. 2°5, diam. 1:7 mill. 
Western New York, Ohio to Ilinois, Michi- 
gan. 
This species is readily distinguished from its 
congeners by its pupzform truncate apex. 
-Illinois specimens in the Philadelphia collec- 
tion are rather larger than the above average 
dimensions. 
C. West Coast Species. 
7. BYTHINELLA INTERMEDIA, Tryon. 
Plate 16, fig. 7. 
Shell elongately turbinated, consisting of 
over four very convex whorls; spire elevated, 
suture profound, apex obtuse; body whorl 
well rounded ; aperture small, nearly round ; 
umbilicus narrow. Color dark green. 
Alt. 5, diam. 3°3 mill. 
Owyhee River, 8S. E. Oregon. 
(30) 4 
