4O 



CONCHOLOGIA CESTRICA. 



Z. suppressus, SAY. 



Helix suppressa, Say, New Harm. 

 Diss., II., 1829. 



Shell small, yellowish-brown, thin, 

 polished; whorls 6, slowly increasing, 

 fine striate above, smooth beneath ; lip 

 thin, callous within the base ; within the outer lip are 

 one, or two, elongated, lamelliform teeth ; umbilicus 

 very small, or absent. H. 4, W. 6, mill. 



Station, in fields, and woods, under stones, timber, etc. 

 Chester County ; abundant. 



Z. interims, SAY. 



Helix interna, Say, Jour. Acad. Phil. F. S., II., 1822. 



Shell convex-orbicular, reddish brown, 

 above ribbed, beneath smooth; whorls 8, 

 narrow, suture deep ; periphery sub-angular ; 

 aperture transverse, narrow, thickened within, 

 at the base, with two short lamellae, near the 

 basal margin ; lip reaching to the axis ; um- 

 bilicus nearly, or sometimes quite, closed. 

 H. 4, W. 6, mill. 

 Station, similar to the preceding. Western Pennsyl- 



C pi & 54 J 



vana. 



Sub-genus HYALINA (FERR.), GRAY, 1840. 



Animal of Hyalina cellaria. [B. & B.] 



Fig, 55, 



Shell mostly small, umbilicate, or closed, and indented ; 

 depressed, vitreous, shining ; whorls 5-6, increasing 

 regularly ; peristome thin, acute ; aperture round-lunate, 

 not angled or depressed. 



