. Bulletin - United States National Museum. Science. EASTERN PROVINCE INTERIOR REGION SPECIES. 291 those of tndenfafa, but distiuguished by the genital bladder, which is small, globular, on a duct of equal width throughout its course, not swelling as it approaches the vagina. Triodopsis trldciatata, Say. Shell umbilicated, orbicularly dei)ressed, with crowded,rib-like stri£e, light horn or chestnut colored; spire very short; Tig. 312. whorls 5.^, rather convex, the last scarcely deflected in front; aperture lunar, subtriangular; peristome white, reflected, its outer contour rounded, thickened
. Bulletin - United States National Museum. Science. EASTERN PROVINCE INTERIOR REGION SPECIES. 291 those of tndenfafa, but distiuguished by the genital bladder, which is small, globular, on a duct of equal width throughout its course, not swelling as it approaches the vagina. Triodopsis trldciatata, Say. Shell umbilicated, orbicularly dei)ressed, with crowded,rib-like stri£e, light horn or chestnut colored; spire very short; Tig. 312. whorls 5.^, rather convex, the last scarcely deflected in front; aperture lunar, subtriangular; peristome white, reflected, its outer contour rounded, thickened within, its terminations converging, joined by a light deposition of callus, bearing a tongue-like, erect, en- tering tooth, both the right and basal portions bear- ing on the inner margin a stout, acute denticle. i. truientata. Greater diameter 16, lesser 14""'; height, 8"™. Helix tridentata,^.\x,W\c\\.'\c\.,Y>\. 1(1817-'19); Einney's ed., 6, pi. Ixx, fig. 1.—Eaton, Zool. Text-Book, 193 (1826).—F^bussac, Tab. Syst., 38; Hist., pi. li, fig. 3.—WooT>, Ind. Supplem., 21, pi. vii, fig, 2 (18-^8); ed. Han- ley, 226, fig. 11.—Deshayes, Eiicycl. Mf^tli., 11,213(1830); iu Lam., viii,llo; ed. 3, 309; iu F^R., 1. c, i, 72.—BiNXEY,Bost. Jouru. Nat. Hist., iii, 382, pi. xvii (1840), part; iu Terr. Moll., ii, iK?, pi. xxvii.—De Kay, N. ,28, pi. ii, fig. 7 (1843).—Adams, Venuont Mollusca, 160 (1-42).—Gould, Iiiverte- brata, 173, fig. 115 (1841).-Pp'eiffer, Mon. llel. Viv., i, 412 ; in Chemxitz, - ed. 2, i,84, pi. x, figs. 7, 8.—Potikz et Michaud, Gal., i,ll4.—Mus. Gray, Fig. Moll. Ad., pi. ccxci, fig. 3 (ex Bost. Jonrn., no deser.).—Reeve, Con. Icon., No. 690 (18.^)2).-W. G. Binney, Terr. Moll., iv, 70 ; L. »fc Sh., i, 129 (1869).—Bland, Ann. N. Y. Lye, vii, 423.—Morse, Amer. Nat.,i, 150, figs. 8, 9 (1867).—Gould and Binney, Idv. of Mass., ed. 2, 422 (1870). Triodopsis htuula, Rafinesque, En. and Ace., 3; ed. Bi
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