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 subcjlindrical, 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 difiers also in its 

 short spire. 



(86) 



