of North American Ilelicidce. 433 



six whorls, Diam. maj. 20, min. 18, Alt. 9i- mill. Some south- 

 ern forms are beautifully sculptured with numerous spiral lines, 

 and have a narrow but very projecting parietal tooth. Near 

 Nashville, Tenn., a small flattened var. is found, widely ribbed 

 above, the ribs obsolete at the base, the lip widely reflected, 

 and the parietal tooth arcuate. 



Say's " var. «, Labrum with two projecting angles," inhabits 

 Illinois ; in some specimens the aperture and teeth are singu- 

 larly like those oi II. jpalliata. 



From Wilmington, N. Car., and City Point, Va., I have a 

 remarkable variety, — depressed, with 4^ whorls, the ribs far 

 apart, and the surface between them somewhat granulated ; the 

 periphery more sharpl}^ anguhited than in other forms, and the 

 parietal tooth more arcuate. Diam. maj. 14, min. 11, Alt. h\ 

 mill. 



Specimens from Illinois have the whorls flattened above, 

 and partially exserted, showing a tendency to variation in the 

 same direction as H. jpalliata. 



Helix palliafa §ay. 



This shell has been fully identified, but doubts exist as to 

 Say's var. «., II. ohstricta Say, II. helicoides Lea, and II. Caro- 

 linensis Lea. Having had much correspondence with concho- 

 logists, both here and in Europe, respecting those forms, I pro- 

 pose fully to examine the questions which have arisen con- 

 cerning them. 



In 1821 Say thus described II. jpalliata and II. olstriota, 

 {Jour. Acad. Nat. Sci., Phila. II., 'pjp. 152-154), — 



H. PALLIATA. — Shell depressed, with elevated lines, forming grooves 

 betvs'een them ; epidermis fuscous, rugose with very numerous minute 

 tuberculous acute prominences; volutions five, depressed above, beueath 

 rounded, forming an obtuse angle extenorlj', which is more acute near 

 the termination of the labrum ; umbilicus covered witli a white callus ; 

 aperture contracted by the labrum ; labrum widely reflected, with two 



