232 HELICID^E. 



63. HELIX DEMISSA, BINNEY. 

 PLATE XLII. FIGURE 1. 



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

 anfractibus sex, minute striatis ; apertura transversa ; labro 

 simplici, acuto ; basi glabra ; umbilico parvo. 



SYNONYMS AND REFERENCES. 



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

 PFEIFFEE, Monog. Helic. Viv. I. 58. 



DESCRIPTION. 



SHELL depressed-convex ; epidermis yellowish horn- 

 color, shining ; whorls six, with 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 thin, 

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

 umbilical region a litt,le impressed. 



Greatest transverse diameter rather more than three- 

 eighths of an inch. 



GEOGRAPHICAL DISTRIBUTION. 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 strias is the same in 

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



