450 UNIVALVE SHELLS 



Type and Class. 

 MOLLUSCA GASTEROPODA. 



Genus Helix. 

 f Umbilicus none ; labrum reflected. 



i. H. *7nultilineata. Shell thin, convex, imper- 

 forated ; of a brown colour, with numerous dark-red 

 revolving lines, which are minutely and irregularly 

 undulated ; whorls six, with elevated, subequidistant 

 lines, forming grooves between them ; aperture luna- 

 ted, not angulated at the base of the column, but 

 obtusely curved ; labrum contracting the mouth 

 slightly, reflected, white, more or less distinctly 

 stained by the termination of the spiral red lines, and 

 adpressed to the body whorl near the base ; umbili- 

 cus covered with a white callus. 



Inhabits Illinois and Missouri. 



Length of the columella about three-fifths ; great- 

 est width rather more than one inch. 



Animal granulated ; granules large, whitish, in- 

 terstices blackish ; foot beneath black. 



An exceedingly numerous species in the moist fo- 

 rests on the margin of the Mississippi near the Ohio, 

 and the Missouri as far as Council Bluff. The red 

 revolving lines are numerous, varying from four or 

 five to twenty-five or thirty and perhaps still more $ 

 they are sometimes confluent into bands; when 

 viewed within the mouth, they appear sanguineous. 



