. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. VITRINA. • 137 Vilrina Amcrimna, , Dec. 1852, Proo. Zodl. Soc, 156. — Ciikmmiz, t'd. 2, 9, IM. I. Figs. 22-25 (1854). Vitrina limpida, (, in Acjassiz' Lako. Suj)(>rior, p. 243, 1850 ; Terr. Moll., 1. c. — Pfkiffkii, Malak. Piatt., II. 10 (1856); Mon. Hel. Viv., IV. 798.— W. G. HiNN'KY, T. M., 33. — Rkeve, Con. Icon., 62. — Morse, Journ. Portl. Soc, I. 11, PI. V. Fig. 17 (1864) ; in Amer. Nat., I. 314, Fig. 20 (18G7).— TuYON, Am. Journ. Conch., II. 243 (1866).—W. G. Pinney, L. & Sh
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. VITRINA. • 137 Vilrina Amcrimna, , Dec. 1852, Proo. Zodl. Soc, 156. — Ciikmmiz, t'd. 2, 9, IM. I. Figs. 22-25 (1854). Vitrina limpida, (, in Acjassiz' Lako. Suj)(>rior, p. 243, 1850 ; Terr. Moll., 1. c. — Pfkiffkii, Malak. Piatt., II. 10 (1856); Mon. Hel. Viv., IV. 798.— W. G. HiNN'KY, T. M., 33. — Rkeve, Con. Icon., 62. — Morse, Journ. Portl. Soc, I. 11, PI. V. Fig. 17 (1864) ; in Amer. Nat., I. 314, Fig. 20 (18G7).— TuYON, Am. Journ. Conch., II. 243 (1866).—W. G. Pinney, L. & Sh., I. 27 (1869).— Gould and P>inney, Invert, of Mass., ed. 2, 394(1870). Found in Maine, Vermont, New Brunswick, and to the northwest of Lake Superior, and at Troy, Utica, Mohawk, and Palmyra, N. Y. The species may- be said to belon"- to the Northern Region. Animal whitish, grayish, or blackish, large compared with the shell. Head, eye-peduncles, and eyes black; tentacles very short. The prolongation of the mantle extends from under the shell, over the back and neck to the base of the eye-peduncles, but is unattached and free; from the right side of the man- tle posteriorly there arises a tongue-shaped process, which is reflected back upon the shell, and reaches to the spire. Respiratory foramen in the posterior part of the mantle, taken with its prolongation. In V. Umpida I have counted 71 rows of 30—1—30 teeth, with 9 perfect laterals. The seventh marginal is the largest. Another gave 39—1—39, with 10 perfect laterals. The membrane figured b}' Morse had 30 rows of 25—1—25 teeth, with 9 laterals. I have figured of this species, on PI. II. Fig. C, one central and its adjacent lateral, and the twenty-third tooth. The marginals increase in size up to the seventh, then gradually decrease. In color the shell varies from almost white to dark horn. Should the species prove identical with the European pellucida, as formerly believed, it must be co
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