of North American Ilelicidce. 115 



Helii: obstricta Say. 



SYNONYMY. 



Helix ohstrida Say Jour. Acad. Nat. Sci. Pbila., II., 154, 1821. 



palliaia Say var. a. Jour. Acad., 1. c, 152. 



Carolinensis Lea Trans. Amer. Phil. Soc. N. S., lY., 



108, pi. XV., figs. 33, a, b, c, 1831. 

 Caracolla helicoides Lea Trans Amer. Phil. Soc, 1. c, 109, 



pi. XV., figs. 34, a, b, c. 

 HqVlx palliata Binney Terr. Moll. II., 136, var. pi. XV., 1851. 



var. IL. Carolinensis W. G. Binney. Terr. 



Moll. IV., 57, 1859. 

 From the dates at which this species and its varieties were 

 described, the most distinctly cariuated form must be treated 

 as the type, although the nature of the variations is the same 

 as in ^ palliata. 



H. obstricta Say {H. helicoides Lea) differs from II. palliata 

 in the following particulars ; the epidermis is free from " tuber- 

 culous prominences," but has raised spiral lines between the 

 cost^ on the upper and lower surfaces of the shell. It has ele- 

 vated, rigid, distant costse, the whorls are subexserted and 

 acutely carinated, the carina of the upper whorls compressed, 

 and overlapping the sutures as in II. Cumherlandiana Lea. 

 The umbilicus, as in the most carinated form of II. palliata., is 

 not always entirely covered by the reflected lip. 



The typical form varies in color from pale to dark brown, 

 and also in size and elevation, as the following measurements 

 will show : 



Diam. maj. 25, min. 22, Alt. 10 mill. (5^ whorls). Cab. W. 



G. Binney, Lea ! ■ 

 " " 23 " 20 " 8i " (5 whorls). Bersh. Spr., 



Tenn., Elliott ! My Cab. 

 " " 20 " 171 " 8 " (5 whorls). Indiana, Dr. 



In galls ! My Cab. 



m 



