. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. M. buccitlenta. tirely covering it; parietal wall sometimes bears a small white tooth at the middle, but oftener not. Greater diameter 18|, lesser 15^ mill.; height, 10|^ mill. (Vol. III. PI. XI. a.) Mesodon clausa, Say. Vol. III. PI. IV., central figures. Shell subimperforate, conoidly semiglobose, rather solid, with crowded rib- like striae, yellowish horn-color; spire subregularly conoid ; whorls 5^, rather convex, gradually increasing, the penultimate subangular, the last rounded, an- teriorly subcoustric
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. M. buccitlenta. tirely covering it; parietal wall sometimes bears a small white tooth at the middle, but oftener not. Greater diameter 18|, lesser 15^ mill.; height, 10|^ mill. (Vol. III. PI. XI. a.) Mesodon clausa, Say. Vol. III. PI. IV., central figures. Shell subimperforate, conoidly semiglobose, rather solid, with crowded rib- like striae, yellowish horn-color; spire subregularly conoid ; whorls 5^, rather convex, gradually increasing, the penultimate subangular, the last rounded, an- teriorly subcoustricted and briefly deflected ; umbilicus narrow, almost covered by the reflected peristome ; aperture diagonal, subregularly lunate; peristome with a heavy, white thickening, uniformly subangularly reflected, its columel- lar portion subdilated. Greater diameter 18^, lesser 16 mill.; height, 11^ mill. Helix clausa. Say, Journ. Phila. Acad., II. 154 (1821) ; American Concli. (1832), No. 4, PI. XXXVll. Fig. 1; BixXNEy's ed., 17, PI. XXXVII. Fig. 1; ed. Chenu, Bibl. Conch., III. 50, PI. XIII. Fig. 2. — Binney, Post. Journ. Nat. Hist., I. 482, PI. XV. (1837); Terr. Moll., II. 107 (exel. syn.), PI. IV. (ex- ceptiug the outline figures). — DeKay, N. Y. MoU., 31, PI. III. Fig. 13 (1843). — Reeve, Con. Icon., Fig. 694.—Bland, Ann. N. Y. Lye, VL 336.— Pfeiffer, Mon. Hel. Viv., IV. 321. — W. G. Binney, Terr. Moll., IV. 46 ; L. k Sh., I. 149 (1869). Helix Fennsylvaiiica, Pfeiffer, ex parte, Synib. ad. Hist. Hel., II. 36 ; Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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