232 HELICID^. 



63, HELIX DEMISSA, BINNEY. 



Pl^TE XLII. FiGUKE 1. 



H. testa depresso-concava, perforata, luteo-cornea, nitente ; 

 anfractibus sex, minute striatis ; apertura transversa ; labro 

 simplici, acuto ; basi glabra ; umbilico parvo. 



SYNONYMS AND KEFEEENCES. 



Helix demissa, Binnet, Boston Journ. Nat. Hist. IV. 361, pi. 16, f. 1. 

 Pfeiffee, Monog. Helic. Viv. I. 58. 



DESCEIPTION. 



Shell depressed-convex ; epidermis yellowisli horn- 

 Color, sMning ; whorls six, witli minute lines of growth ; 

 spire obtuse ; suture impressed ; body-whorl expanding 

 very little towards the aperture ; aperture transverse, 

 not large, a white, testaceous deposit within ; lip thhi, 

 acute ; base rather flat, smooth ; umbihcus very small ; 

 umbilical region a little impressed. 



Greatest transverse diameter rather more than three- 

 eighths of an inch. 



Geographical DiSTRiBtiTiON. The only specimens 

 which I have yet seen were procured in the Western 

 part of Pennsylvania. 



Remarks. This is a delicate and very pretty species, 

 and is distinct from every thing, unless it be Helix ligera. 

 The character of the surface and strige is the same in 

 both ; and the base is nearly the same. I have seen 



