CONCHOLOGIA CESTRICA. 27 



OBS. Our largest Helix. In some localities it has a 



tOOth On the pillar lip. Lin f /ual Dentition o fM. 



albolabris. [Morse.] 

 Fig. 17, 



M. Sayii, BINN. 



Helix diodonta, Say, Long's Ex- 

 ped., II., 1824. Sayii, Binn., Bost. 

 Jour. Nat. Hist., III., 1840. 



M , Snyii. [B. & B.] 



Fig, 18, 



Shell depressed-orbicular; whorls 

 5-6, obliquely striate ; aperture sub- 

 orbicular; lip narrowly reflected, 

 white, and with a tubercular tooth 

 at base ; pillar lip toothed ; umbili- 

 cus narrow, deep ; pale horn color. 

 H. 15, W. 22, millimeters. 



Station, in forests, Western Penn- 

 sylvania. 



M. Pennsylvanica, GREEN. 

 Helix Pennsylvanica, Green, Cont. 

 Maclur. Lye., No. I, 1827. 



M. Pennsylvanica. [B. & B.] 



Fig. 19, 



Shell turbinate, sub-globose, ob- 

 liquely striate, with elevated ridges ; 

 whorls 6, convex ; aperture sub-tri- 



