170 BULINUS. 
Length 18, diam. 6 mill. 
Grand Rapids, Mich. 
This shell differs from B. hypnorum by its 
larger size, less attenuated spire, more twisted 
columella and its uniform pink aperture. 
3. BULINUS HORDACEUS, Lea. 
Plate 7, fig. 19. 
Shell subcylindrical, somewhat transparent, 
polished, pale reddish; spire somewhat raised, 
rather pointed ; sutures somewhat impressed ; 
whorls five, the last large and constricted ; 
outer lip acute, with a reddish line on the 
margin ; aperture ovate, with an acute angle 
above; columella somewhat impressed and 
slightly thickened. 
Length 6°5, diam. 3°2 mill. 
Oregon. 
This is a much smaller species than any 
others in the genus, and differs also in its 
short spire. 
(86) 
