. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 318 TERRESTRIAL AIR-BREATHING MOLLUSKS. XLIII. Figs. 1, 2, 3.—BiNNEY, Bost. Journ. Nat. Hist, I. 475, PI. XIII. (1837) ; Terr. Moll., II. 99, I'l. II. — DeKay, N. Y. Moll., 26, PI. II. Fig. 12 (1843). — Gould, Invert., 170, Fig. 101(1841); ed. 2, 423 (1870). — Leidy, T. M., I. 252, PI. VI. (1851), anat.— Pfeiffer, Symb., II. 22, exel. 7 and 5 ; Mon. Hel. Viv., I. 290, excl. /3 and 7 ; in Chemnitz, ed. 2, I. 81, PI. XV. Figs. 7, 8 (1847), excl. var. C and D, PI. X. Figs. 4, 5. — Potiez et Miciiauu, Gal. I. 69.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 318 TERRESTRIAL AIR-BREATHING MOLLUSKS. XLIII. Figs. 1, 2, 3.—BiNNEY, Bost. Journ. Nat. Hist, I. 475, PI. XIII. (1837) ; Terr. Moll., II. 99, I'l. II. — DeKay, N. Y. Moll., 26, PI. II. Fig. 12 (1843). — Gould, Invert., 170, Fig. 101(1841); ed. 2, 423 (1870). — Leidy, T. M., I. 252, PI. VI. (1851), anat.— Pfeiffer, Symb., II. 22, exel. 7 and 5 ; Mon. Hel. Viv., I. 290, excl. /3 and 7 ; in Chemnitz, ed. 2, I. 81, PI. XV. Figs. 7, 8 (1847), excl. var. C and D, PI. X. Figs. 4, 5. — Potiez et Miciiauu, Gal. I. 69.—Reeve, Con. Icon., No. 624. — Deshayes in Fer., I. 137, PI. XLIII. Figs. 1, 2, 3, 5.—Billings, Canadian Nat. and Geol., 1857, II. 98, Figs. 2, 3. — Bland, Ann. N. Y. Lye, VI. 358 (1858). — W. G. Binney, Terr. Moll, IV. 43; L. & Sh., I. 136, Figs. 229, 230 (1869).—Morse, Amer. Nat., I. 6, PI. I. Figs. 1 - 11 ; 96, Fig. 2 (1867). Eelixrufa, DkKay ? N. Y. Moll., 44, PI. III. Fig. 30 (1843). Mesodon albolabris, Morse, Journ. Portl. Soc, I. 8, Fig. 7, PI. III. Fig. 8 (1864). — Tryon, Am. Journ. Conch., III. 39, 44 (1867). A species of the Eastern Province. Canada to Arkansas, Georgia to Minne- sota. Also in the Post-pleiocene of the Mississippi Valley. Specimens of M. albolabi'is are sometimes found FiiT 208 ^^^ J_ bearing a well-developed parietal tooth. Such are very plenty in the Alleghany Mountains in Pennsyl- vania. One is here figured (Fig. 208). The genitalia and lingual dentition of this form is the same as in the typical form. Pfeiffer's var. y and d of the Symbolae are respec- tively major and exoleta. In the Monograph his ^ M. albolabris, var. ^^ perhaps the former, and his y certainly is. In Chemnitz ed. nov. he figures exoleta as var. D, and places major as C. In Vol. VII. of the Monographia the synonymy of the group is correctly given. Deshayes in Ferussac's History erroneously gives Guadeloupe as the habi- tat. From his reference
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