. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 310 TERRESTRIAL AIR-BREATHING MOLLUSKS. * 412 ; in Chemnitz, ed. 2, I. 364, PI. LXIV. Figs. 7-9. — Ri-eve, Con. Icon., No. 686 (1852). — \V. G. Binney, L. k Sh., I. 131 (1869). Helix tridentata, Binney, Ft. Bost. Journ. Nat. Hist., III. 382, PI. XVIII. Fig. 3 (1840); Terr. Moll., II. 183, PI. XXVIII. —W. G. Binney, Ten-. Moll., IV. 72. Triodopsis fciUax, Tryon, Amer. Journ. Conch., III. 51 (1867). From Canada to Texas and Florida, all over the Eastern Province. Nearly allied to T. tridentata^ but in th
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 310 TERRESTRIAL AIR-BREATHING MOLLUSKS. * 412 ; in Chemnitz, ed. 2, I. 364, PI. LXIV. Figs. 7-9. — Ri-eve, Con. Icon., No. 686 (1852). — \V. G. Binney, L. k Sh., I. 131 (1869). Helix tridentata, Binney, Ft. Bost. Journ. Nat. Hist., III. 382, PI. XVIII. Fig. 3 (1840); Terr. Moll., II. 183, PI. XXVIII. —W. G. Binney, Ten-. Moll., IV. 72. Triodopsis fciUax, Tryon, Amer. Journ. Conch., III. 51 (1867). From Canada to Texas and Florida, all over the Eastern Province. Nearly allied to T. tridentata^ but in this the spire is more elevated, and sometimes has 6 full volutions. There is a deep groove behind the peristome, contracting the aperture; the peristome is widely reflected, and directed in- wards, forming a basin-shaped mouth; the upper tooth on the peristome is broader, sometimes bifid, and even trifid, and very much inflected; the parietal tooth extends quite to the base of the shell, and unites Avith the extremity of the peristome; the aperture is nearly filled up by the teeth and the contraction of the peristome. Animal as in T. tridentata (see B. J. N. H., I. PI. XYIIL). Jaw as usual in the genus; 14 ribs. Lingual membrane (PI. VII. Fig. L) has about 40—1—40 teeth ; 12 perfect laterals. This (not tridentata) had no bifurcation to the inner cutting point of the transition teeth (thirteenth and fourteenth teeth), at least on the portion of the membrane examined by me. Genitalia (PI. XV. Fig. B) as in tridentata, but the duct of the genital blad- der is of equal size throughout its length, — an unimportant, even if constant diiference. Triodopsis introferens, Bland. Shell umbilicate, globose, depressed, thin, with rib-like striae, yellowish horn- colored ; spire convex; whorls 6, moderately convex, the last scarcely descend- ing, much constricted at the aperture, with two exterior pits, sub- angular at the periphery, convex beneath, grooved within the umbilicus; a
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