. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 210 TERRESTRIAL AIR-BREATHING MOLLUSKS. Pupa corticaria, Say, Nich. Encycl., IV. ed. 3, 1819, PI. IV. Fig. 5. — Gould, Boat. Journ. Nat. Hist., III. 397, PI. HI. Fig. 19 (1840) ; IV. 358 (1843). - DeKay, N. Y. Moll. 50, PI. IV. Fig. 49 (1843). — Kustek, in Chemnitz, 2d ed., p. 27, Tab. XIII. Figs. 19-20. — Pfeiffer, Mon. Hel. Viv., II. 328. — Binnky, Terr. Moll., II. 339, PI. LXX1I. Fig. 4. — W. G. Binney, Terr. Moll., IV. 146 ; L. & Sh., I. 244 (1869). — Gould and Binney, Invert, of Mass. [2], 439 (1870).
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 210 TERRESTRIAL AIR-BREATHING MOLLUSKS. Pupa corticaria, Say, Nich. Encycl., IV. ed. 3, 1819, PI. IV. Fig. 5. — Gould, Boat. Journ. Nat. Hist., III. 397, PI. HI. Fig. 19 (1840) ; IV. 358 (1843). - DeKay, N. Y. Moll. 50, PI. IV. Fig. 49 (1843). — Kustek, in Chemnitz, 2d ed., p. 27, Tab. XIII. Figs. 19-20. — Pfeiffer, Mon. Hel. Viv., II. 328. — Binnky, Terr. Moll., II. 339, PI. LXX1I. Fig. 4. — W. G. Binney, Terr. Moll., IV. 146 ; L. & Sh., I. 244 (1869). — Gould and Binney, Invert, of Mass. [2], 439 (1870). Carychium corticaria, Ferussac, Prodr., No. 3 (no descr.). Leucochila corticaria, Morse, Journ. Portl. Soc, I. 36, Fig. 87 ; PI. X. Fig. 88 (1864). — Tryon, Am. Journ. Conch., III. 307 (1868). From Maine and Wisconsin to South Carolina and Mississippi. I believe, therefore, that it will prove to be found over all the Eastern Province. Animal whitish, darker upon the head and eye-peduncles; the latter are long and club-shaped ; tentacles short, thick. This is a very thin and delicate shell, and has a peculiar transparency, resembling spermaceti. The aperture is somewhat circular, the upper part Tig. Pupa corticaria. being interrupted by the last whorl, and the extremities of the peristome not being connected. The smaller tooth is often wanting, and sometimes both. In the number and position of the teeth it somewhat resembles Carychium exiguum ; but it is less fusiform, and more cylindrical. In general outline, and in the shape of the aperture, it very much resembles P. rupicola, but the parts within the aperture are very different. It is, however, just what the immature shell of that species might be supposed to be, when the dentiform deposits were only commenced, and the peristome thin and unfinished. I am much inclined to believe that it is only a young shell. In the great number of specimens which I possess, the teeth are only rudimentary. Jaw slightly arc
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