of North American Ilelicidce. 437 



The onlj shell to wliich the description applies (excluding H. 

 ohstrida) is 11. CaroUnensls or an intermediate form, and I am 

 decidedly of opinion that Lea's species has been misunderstood 

 by authors ; that it is in fact a variety of H. ohstricta^ to which 

 it is nearly allied in epidermis and sculpturing, rather than of 

 H. palliata^ from which, in those particulars, it essentially 

 differs. 



The nature of the epidermis and sculpturing are the only 

 constant specific characters which distinguish H. fdlliata from 

 H. ohstricta. In the former the epidermis has " numerous 

 minute tuberculous acute prominences ;" the striae are close 

 together, and somewhat irregular in development. In the typi- 

 cal form the whorls are convex, with a well impressed suture ; 

 the last whorl is obtusely angulated in front of, but not beliind 

 the aperture. 



The following are the dimensions of the largest and smallest 



specimens in my cabinet. 



Diam. maj. 23, min. 20, Alt, 10 mill, {h whorls), 

 u u -L7 a 14 u g u (41. u y 



The species varies in the form of the whorls and extent of the 

 angulation of the periphery, as follows. 



Var. /3. — Whorls flattened above, slightly exserted, the last 

 more sharply angulated in front of the aperture, with the striae, 

 especially behind the aperture, more distinctly defined. 



Diam. maj. 22, min. 19^, Alt. 8i mill. (5 whorls). 



I am indebted to Mr. A. O. Currier of Grand Rapids, Mich., 

 for beautiful specimens from Mumfordsville, Ky., and Pittsburg 

 Landing, Tenn. 



■ Yak. 7. — Whorls planulate above, and so exserted as to 

 show the carinated edges of all excepting the apicial whorls, 

 the last whorl with an acute projecting carina continued to the 

 back of the aperture ; the umbilicus not always entirely covered 

 by the reflected lip. 



Diam. maj. 21i, min. 18^, Alt. 1 mill. (5 whorls). 



Bishop Elliott collected fine specimens at Jasper Town, Tenn. 



