124 LAND AND FRESH- WATER SHELLS OF N. A. [PART J. 



with brown, widely reflected, with two projecting teeth on the inner margin, 

 tlie one near its junction with the body-whirl acute and prominent, the 

 other, on the basal portion, long, lamellar, and but 

 Fig. 207. little prominent ; parietal wall with a very prominent, 



white, curved tooth, projecting nearly perpendicularly 

 from the shell, and forming one boundary of the aper- 

 ture ; umbilicus covered with a white callus, the con- 

 tinuation of the reflected peristome ; base convex. 

 Greater diam. 21, lesser 18 ; height 10 mill. 



Helu palliata. Helix palliata, Say, Journ, Phila. Acad. II, 152 



(1821) ; Bixxey's ed. 10.— Bixney, Bost. Journ. 

 Nat. Hist. Ill, 353, pi. vii (1840) ; Terr. Moll. II, 136, part, pi. xiv. 

 — Adam.=!, Vermont Mollusca, 159 (1842).— Leidy, T. M. U. S. I, 

 253, pi. vii, f. 8 (1851), auat.— DeKay, N. Y. Moll. 33, pi. iii, f. 3(5 

 (excl. a, b), (1843), excl. syn. pars. — Pfeiffer, Mon. Hel. Viv. I, 

 316; in Chemnitz, ed. 2, I, 359, pi. Ixii, f. 15, 16 (1849).— Mrs. 

 Gray, Fig. Moll. An. pi. cxciii, f. 8, ex Bost. Journ. (no descr.). — 

 Deshayes in Fer. I, 144 (excl. var.). — Reeve, Con. Icon. no. 678. — 

 W. G. BiNNEY, Ter. Moll. IV, 56.— Bland, Ann. N. Y. Lye. VII, 441. 

 —Morse, Amer. Nat. I, 150, f. 10, 11 (1867). 



Helix denotata, Ferussac, Tab. Syst. 38 (1822), no descr. ; Hist. pi. xl, 

 a, f. 5 ; pi. 1, a, f. 7.— Deshayes in Lam. VIII, 115 ; ed. 3, III, 309. 



Helix notata, Deshayes, Encycl. Meth. II, 224 (1830). 



Xolotrema palliata, Tryon, Am. .Journ. Conch. Ill, 49, pi. ix, f. 4 (1867). 



From Canada to Georgia through eastern North America. 

 Also in the postpleiocene of the Mississippi Yalloy. 



Auiiual of a uniform, blackish, slate-color over the whole upper 

 surface ; foot narrow, in length double the diameter of the shell, 

 and terminating in an acute point ; eye-peduncles one-third of an 

 inch long ; eyes not distinguishable from the general color (see 

 p. 123). 



The nature of the epidermis and sculpturing are the only 

 constant specific characters which distinguish H. loalliata from 

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

 tuberculous acute prominences;" the stria? are close together, 

 and somewhat irregular in development. In the typical form the 

 whirls are convex, with a well impressed suture ; the last whirl 

 is obtusely angnlated in front of, but not behind the aperture. 



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

 angulation of the periphery, as follows : — 



Yar. /3. — Whirls flattened above, slightly exserted, the last 

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



