CONCHOLOGIA CESTRICA. 



39 



[B. & B.j 

 Fig, 50, 



Fig, 51. 



Z. ligerus, SAY. 



Helix ligera, Say, Jour. Acad. Phila., F. S., II., 

 1821. 



Shell sub-globose, obtuse, brownish-yellow above, 

 paler beneath ; whorls 6-7, oblique-striate ; z u ff( >rus. 

 aperture lunate; lip acute, with a strong 

 deposit within the margin, near its base; 

 umbilicus very small, or none. H. 6-8, W. 

 11-15, mill. 



Station, in woods. Chester County ; not 

 common. 



Z. demissus, BINN. 



Helix demissa, Binn., Bost. Jour. Nat. Hist, IV., 



1843. 



Shell depressed, yellowish, thickly striate ; 

 base somewhat flattened, smooth; aperture 

 sub-transverse, compressed-lunate ; umbilicus 

 very small ; lip acute, thickened within the 

 margin. H. 6, W. 10-12, mill. 



Station, in mountainous districts. Western 

 Pennsylvania. 



Z. gularis, SAY. 



Helix gularis, Say, Jour. Acad. Phila. F. S., II., 

 1822. 



Shell depressed-conical, shining, dusky- 

 yellow ; whorls 78, very minute at the 

 apex ; aperture transverse ; lip thickened 

 within, at base, with one, or more, elon- 

 gated, lamelliform, teeth ; one at the base, 

 the other more central ; umbilicus covered, 

 or very small. H. 5-7, W. 7-9, mill. 



Station, under wet logs, and decayed leaves, 

 caster County, Pennsylvania. 



Z. gularis. 



[B. & B.] 

 Fig, 52, 



Lan- 



