. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 318 TERRESTRIAL AIR-BREATHING MOLLUSKS. XLIII. Figs. 1, 2, 8. —Bikkbt, Bost. Journ. Nat. Hist., I. 475, PI. XIII. (1837) ; Terr. Moll., II. 99, PI. 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. — Pfeiffek, Symb., II. 22, excl. y and 5 ; Mon. Hel. Viv., I. 290, excl. /3 and y ; in Chemnitz, ed. 2, I. 81, PI. XV. Figs. 7, S (1847), excl. var. C and D, PI. X. Figs. 4, 5. — Potiez et Michaud, d. I. 69.—Reeve, Con
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 318 TERRESTRIAL AIR-BREATHING MOLLUSKS. XLIII. Figs. 1, 2, 8. —Bikkbt, Bost. Journ. Nat. Hist., I. 475, PI. XIII. (1837) ; Terr. Moll., II. 99, PI. 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. — Pfeiffek, Symb., II. 22, excl. y and 5 ; Mon. Hel. Viv., I. 290, excl. /3 and y ; in Chemnitz, ed. 2, I. 81, PI. XV. Figs. 7, S (1847), excl. var. C and D, PI. X. Figs. 4, 5. — Potiez et Michaud, d. 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. — Blank, Ann. N. Y. Lye., VI. 358 (185S). — W. G. Linney, Terr. Moll, IV. 43; L. & Sh., I. 136, Figs. 229, 230 (1SG9).—Mouse, Ainer. Nat., I. 6, PI. I. Figs. 1 -11 ; 96, Fig. 2 (1867). Helix rufa, DeKay? N. Y. Moll., 44, PL III. Fig. 30 (1S43). Mesodcm albolabris, Morse, Journ. Portl. Soe., I. 8, Fig. 7, PI. III. Fig. S (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 Fost-pleiocenc of the Mississippi Valley. Specimens of M. albolabris are sometimes found 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 8 of the Symbolas are respec- tively ma/or and exoleta. In the Monograph his ;3 is perhaps the former, and his y certainly is. In M. albolabris, var. ' ' r J 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 to Ferussac's plat
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