EASTERN PROVINCE — INTERIOR REGION SPECIES. 279 



Helix hirsuta, Say, Journ. Phila. Acad., i, 17 (1817); ii, 161; ed. Binney, 8. — BiN- 

 NEY, Bost. Journ. Nat. Hist., iii, 365, \)\. x, fig. 3 (1840); Terr. Moll., ii, 150, 

 pi. xliii, fig. 3, excl. st€notrema.—Di& Kay, N. Y. Moll., 36, pi. iii, fig. 27. — 

 Gould, Invertebrata, 175, fig. 116 (1841).— F^.russac, Tab. Syst., 38; Hist., 

 pi. 1, a, fig. 1.— Deshayes in Lam., viii, 113; ed. 3, 308; Encyl. M6th., ii, 

 253 (1830); in F^R., i, 140.— Mrs. Gray, Fig. of Moll. An., pi. cxciii, fig. 8, 

 ex Bost. Journ.— Pfeiffer, Mod. Hel. Viv., excl. var., (3, i, 421; in Chem- 

 nitz, ed. 2, excl. var., i, 374 (1846), pi. Ixv, figs. 9-11 (1849).— Reeve, Con. 

 Icon., No, 714 (1852).— Leidy, T. M. U. S., i, 257, pi. xi, figs. 5, 6 (1851), 

 anat— W. G. Binney, Terr. Moll., iv, 62; L. & Fr.-W. Sh., i, 118 (1869).— 

 Bland, Ann. N. Y. Lye, viii, 327.— Morse, Am. Nat., i, 151, figs. 14, 15 (1867). 

 —Gould and Binney, Inv. of Mass. (2), 417 (1870), 



Helix sinuata, y, Gmelin (teste Pfeiffer). 



Helix isognomosiomos, y, Gmelin (teste Pfeiffer). 



Triodopsis hirsuta, Woodward, Man., pl. xiii, fig. 7, no descr. 



Helix fratcrna, Wood, Index, Suppl., 21, pl. viii, fig. 16 (1828); ed. Hanley, i26, 

 fig. 16. 



Helix 1 porcina. Say, Long's Exped. (1824), ii, 257, pl. xv, fig. 2 (young); Binney's 

 ed., 30, pl. Ixxiv, fig. 2.— De Kay, N. Y. Moll., 45 (1843).— Pfeiffer, Mon. 

 Hel. Viv., iii, 97.— Bland, Ann. N. Y. Lye, vi, 344, with fig. (1858), 



Stenotrema hirsuta, Tryon, Am. Journ. Conch,, iii, 57 (1867). — W, G. Binney, Terr. 

 Moll., V, 296 {hirsiitum). 



ADimal whitish ; head, eye-peduncles, and tentacles slate color ; 

 foot slender, semi-transparent ; length less than twice the diameter of 

 the shell, terminating acutely ; cavity of the eye-peduncles apparent, 

 when they are retracted, by two dark lines with a white space be- 

 tween. 



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

 Eegions as far as Kansas and Virginia, and even into Alabama. 



The last whorl in front of the aperture, especially in the larger 

 forms, is more or less angulated, but never carinated. The position 

 of the parietal tooth is often rather oblique, but usually nearly parallel 

 with the peristome, and is more or less distant from it. The nature 

 of the epidermis varies ; in some forms the hairs are very numerous, 

 in others comparatively few. Spiral impressed lines sometimes occur 

 beneath the epidermis, at the base of the shell. 



Jaw as usual ; 8 crowded, broad ribs. 



Lingual membrane (Terr. Moll., V, Plate VII, Fig. F) has 22-1-22 

 teeth; 10 perfect laterals. 



Anatomy figured by Leidy {I. c). 



Genitalia (Fig. 5) : Penis sac long, cylindrical, blunt above, where 

 it receives retractor muscle and vas deferens ; genital bladder narrow, 

 elongate- ovate, on a short, narrow duct ; the convolution in the epidid- 

 ymis commences near the testicle. 



