EASTERN PROVINCE INTERIOR REGION SPECIES. 285 



Helix palliata, Say, Jonrn. Pliila. Acad., ii, 152(1821) ; BiNNEY'sed., 10. — Binney, Boat. 

 Journ. Nat. Hist., iii 353, pi. vii, (1840); Terr. Moll., ii, 136, part, pi. xiv.— 

 Adams, Vermont Mollusca, 159 (1842).— Leidy, T. M. IJ. S., i, 253, pi. vii, 

 fig. 8 (1851), anafc.— De Kay, N. Y. Moll., 33, pi. iii, fig. 36 (excl. a, b) (1843) 

 excl. syu. pars.— Pfeiffer, Mon. Hel. Viv., i, 316; in Chemnitz, ed. 2, i, .359, 

 pi. Ixii, figs. 15, 16 (1849).— Mks. Gray, Fig. Moll. An., pi. cxciii, Fig. 8, ex 

 Bost. Journ. (no descr.). — Deshayes, in Fer., i, 144 (excl. var.). — Reeve, 

 Con. Icon., No. 678.— W. G. Binney, Terr. Moll., iv, 56 ; L. & Fr.-W. Sh., 1, 124 

 (1869).— Bland, Ann. N. Y. Lye, vii, 441.— Morse, Amer. Nat., i, 150, figs. 

 10, 11 (1867).— Gould and Binney, Inv. of Mass., ed. 2, 420 ("1870). 



Helix denotata, Ferussac, Tab. Syst., 38 (1822), no descr. ; Hist., pi. xl, a, fig. 5 ; pi. 1, 

 a, fig. 7. — Deshayes, in Lam., viii, 115; ed. 3, iii, 309. 



Helix notata, Deshayes, Encycl. M6th., ii, 224 (1830). 



Xolotrema palliata, Tryon, Am. Journ. Conch., iii, 49 (1867). 



Triodo^sis 2>alliata, W. G. Binney, Terr. Moll., v, 302. 



A Post-Pliocene species, now found in the Northern and Interior 

 Eegions ; from Canada to Georgia and Louisiana. 



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

 face ; foot narrow, in length double the diameter of the shell, and ter- 

 minating in an acute point; eye-peduncles one-third of an inch long ; 

 eyes not distinguishable from the general color (see p. 301). 



The nature of the epidermis and sculpturing are the only constant 

 specific characters which distinguish ;palliata from obstricta. In the 

 former the epidermis has " numerous minute tuberculous acute promi- 

 nences "; the striae are close together and somewhat irregular in de- 

 velopment. In the typical' form the whorls are convex, with a well- 

 impressed suture ; the last whorl is obtusely angulated in front of, but 

 not behind the aperture. 



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

 tion 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. Greater diameter 22, 

 lesser lO^"™; height, 8^"^". (5 whorls.) Kentucky and Tennessee. 



Yar. y. — Whorls planulate above, and so exserted as to show the 

 carinated edges of all excepting the apical 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. Greater 

 diameter 21^, lesser 18^"™; height, 7""°. (5 whorls.) Tennessee. 



The lingual membrane (Terr. Moll., V, Plate VII, Fig. O) has 34-1-34 

 teeth ; 12 perfect laterals ; another specimen had 14 laterals. Morse 

 counted 115 rows of teeth. The inner cutting point of the transition 

 teeth in this species is very large, as shown in c. 



