118 



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



It is not found in the Eastern or Middle States, but from North 

 Carolina and Kentucky it extends through all the Southern States. 

 Also in Indiana, and in the postpleiocene of the Mississippi 

 Valley. 



In H. stenotrema the notch is invariably small, and more central 

 than in H. hirsuta ; the parietal tooth is more produced over the 

 aperture, aud its lowftr edge is a regular curve, not somewhat 

 sinuous as in the latter and H. spinosa ; it is also curved down- 

 wards at its outer extremity, nat terminating abruptly, as usual 

 in those species. The form of the parietal tooth, however, varies 

 in H. hirsuta, from which this species can chiefly, if indeed not 

 alone, be distinguished by the size and position of the notch. 



Helix hirsuta, Sat. — Shell imperforate, subglobose; epidermis 



brownish, or chestnut, covered with numerons, sharp, rigid hairs ; whirls 



five, rounded; suture distinct; aperture contracted, very narrow, almost 



closed by an elongated, lamelliforra tooth, situated on the 



Fig. 196. parietal wall, and extending from the centre of the base, within 



the junction of the peristome with the outer whirl, into the 



edge of the aperture ; peristome narrow, very much depressed, 



and reflected against the outer whirl, with a deep cleft or fissure 



near the centre of the basal margi-n ; umbilicus wholly covered ; 



base convex ; far within the base of the shell is a transverse 



tubercle starting from the axis. Greater diam. 7^, lesser 7 ; 



height 4| mill. 



Helix hirsuta, Say, Journ. Phila. Acad. I, 17 (1817) ; II, 161 ; ed. BrN- 

 NET, 8.— BiNSEY, Bost. Joiim. Nat. Hist. Ill, 365, pi. x, f. 3 (1840); 

 Terr. Moll. II, 150, pi. xlii, f. 3, excl. stenotrema.— DeKa^, N. Y. Moll. 

 36, pi. iii, f. 27. — Gould, Invertebrata, 175, f. 116 (1841). — Ferussac, 

 Tab. Syst. 38 ; Hist. pi. 1, a, f. 1.— Deshayes in Lam. VIII, 113 ; ed. 

 Ill, 308 ; Encycl. Meth. II, 253 (1830) ; in Feb. 1, 140.— Mrs. Gray, 

 Fig. of Moll. An. pi. cxciii, f. 8, ex Bost. Journ. — Pfeiffer, Mon. 

 Hel. Viv. excl. var. 3, I, 421 ; in Chemnitz, ed. 2, excl. var. I, 374 

 (1846), pi. Ixv, f. 9-11 (1849).— Reeve, Con. Icon. no. 714 (1852).— 

 L^iDY, T. M. U. S. I, 257, pi. xi, f. 5, 6 (1851), anat.— W. G. Binnet, 

 Terr. Moll. IV, 62.— Bland, Ann. N. Y. Lye. VII, 327.— Mobse, 

 Amer. Nat. I, 151, f. 14, 15 (1867). 



Helix sinuata, y, Gmelin (teste Pfeiffer). 



