CONCHOLOGIA CESTRICA. 



Z. Icevigntus. 



[B. & B.J 



Pig, 47, 



Z. laevigatus, PFR. 



Helix laevigata, Pfr., Mon. Hel. Viv., I., 1848. 



Shell globosely depressed, thin, green- 

 ish horn color; whorls 5, closely striate 

 above, smooth, and shining, beneath ; 

 last whorl rapidly expanding ; aperture 

 rounded-lunular; lip simple, much thick- 

 ened, within the base, and slightly re- 

 flected, around a moderate umbilicus. 

 H. 9, W. 18, mill. 



Station, mountains. Sunbury, Penn- 

 sylvania. 



Z. inornatus, SAY. 



Helix inornata, Say, Tour. Acad. Phila. F. 



Z. inornatus. J ' J 



[B. &B.] S., II., 1821. 

 Fig, 48, 



Shell much depressed, smooth, shining, 

 pale yellow; whorls 5, flattened above; 

 aperture transverse ; lip thin, acute, with an 

 internal, white, deposit; umbilicus small, 

 deep. H. 6, W. 16, mill. 



Station, in woods. Lancaster County, 

 Pennsylvania. 



Z. subplanus, BINN. 



Helix subplana, Binn., Bost. Jour. Nat. 

 Hist, IV, 1842. 



?. subplanus. 



[B. & B.] 



Fig, 49, 



Shell small, planulate, above, and be- 

 neath, greenish-brown, shining; whorls 

 5 %, fine striate, near the apex ; aperture 

 transverse ; lip simple ; umbilicus small, 

 round, and deep. H. 6, W. 18, mill. 



Station, mountains. Western Pennsyl- 

 vania. 



