346 A PROPOSED CLASSIFICATION OF THE GENUS HELIX. 
cus small, nearly concealed; length ~, inch. Lower Canada. In 
shape somewhat resembles a Bulimus for which it might be mistaken. 
H. uypropuita (Ingalls) —Whorls about 5, rounded, striated 
across with very fine lines; shell thin, horn color or whitish and 
translucent, polished; umbilicus rather large, profound; breadth, 4 
inch.. Upper Canada. ‘This species and Sériatella and Alternata are 
very common. 
DIVISION II. 
SHELLS TOOTHED. 
Section A.—Umbilicus closed or wanting. 
Sus-Src. A.—Shells large, over $ inch in diameter. 
1. Lip reflected. 
H. avsoxasris (Say).—Occasionally found with a small tooth. 
See Division I., Sec. A., Sub-Sec. A. 
H. pauuiata (Say).—Whorls 5; shell depressed with elevated 
lines, forming grooves between them ; epidermis fuscous, rugose, with 
numerous tuberculous prominences ; labrum widely reflected, white, a 
prominent tooth on the inner side above tke middle, and a projecting 
angle near the middle of the lip; labrum (inner or pillar lip) witha 
large prominent white tooth; greatest breadth inch. It much re- 
sembles ¢ridentata, but is larger and has no umbilicus. Some varie- 
ties have an acute carina, and are destitute of the minute prominences; — 
breadth nearly | inch. Douglas Village, Garafraxa, Co. Wellington. 
2. Lip simple. 
Sus-Sec. B.—Shells small, less than + inch in diameter. 
1. Lip reflected. 
H. wrtecta (Say).—Lower Missouri. 
2. Lip simple. 
H. guiaris (Say).—Ohio and Pennsylvania. 
Section B.—Shells umbilicated. 
Sus-Sec. A.—Shells large, umbilicus exhibiting all the whorls. 
1. Lip reflected. 
H. proponta (Say).—New York. 
2. Lip simple. 
Sus-Sec. B.—Shells small, umbilicus exhibiting all the whorls. 
le Lip reflected. 
Fi. FAuLAx (Say). 
