. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. T. tridentala, (leformcd. Fie. Triodopsis Harfordiana, J. G. Cooper. Shell umbilicated, depressed-globose, thin, surface scarcely broken by incre- mental wrinkles, horn-colored; spire slightly elevated, apex obtuse; whorls 4, convex, suture impressed, the last globose below ; aperture oblique, lunate, trilobed, one tooth on the parietal wall, and two on the reflected peristome; peristome white, broad, reflected, with a toothlikc process near either termination. Greater diameter 9, lesser 6 mill.; height
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. T. tridentala, (leformcd. Fie. Triodopsis Harfordiana, J. G. Cooper. Shell umbilicated, depressed-globose, thin, surface scarcely broken by incre- mental wrinkles, horn-colored; spire slightly elevated, apex obtuse; whorls 4, convex, suture impressed, the last globose below ; aperture oblique, lunate, trilobed, one tooth on the parietal wall, and two on the reflected peristome; peristome white, broad, reflected, with a toothlikc process near either termination. Greater diameter 9, lesser 6 mill.; height, 3 mill. Helix Harfordiana, J. G. Cooper, Amer. Joum. Conch., V. 196, PI. XVII. Fig. 3 (1870). In the Californian province, in Fresno County, " Big Trees," latitude 37°, 6,500 feet altitude. In the Central Province at Sal- mon River, Idaho. Jaw as usual; ribs over 12. Lingual membrane (PI. VII. Fig. R,) as usual in the genus. Teeth 26—1—26, with 12 laterals. The side cutting points to central and lateral teeth are well developed. Triodopsis fallax, Say. Vol. III. PI. XXVIII. Shell umbilicated, depressed-globose, with rib-like striae, reddish horn-colored; spire convex ; whorls 6, rather convex, the last deflected anteriorly, constricted; aperture trilobed, contracted by a large, oblique, tongue-shaped, arcuately en- tering tooth on the parietal wall; peristome reflected, thickened within, white, with 2 teeth, the upper one bending inward not on the edge, the other sub- basal. Greater diameter 13, lesser 11 mill.; height, 7^ milL Helix fallax, Say, Journ. Phila. Acad., V. 119 (1825) ; Binney's ed., 27. —De- Kay, N. Y. Moll., 28, PI. III. Fig. 23 (1813). —Pfeiffer, Men. Hel. Viv., 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. Cambridg
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