. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 122 TERRESTRIAL AIR-BREATHING MOLLUSKS. Fig. Z. conspectus, enlarged. equal to two sevenths the diameter of the shell; aperture ob- lujue, roundly lunate; peristome simple, strai<;ht, the margins approaehing, the columellar margin seareely dilated. Greater diameter 2, lesser 1| mill.; height, 1 mill. Helix conspecta, Bland, Ann. N. Y. Lye. VIII. 1(53, Fig. 7 (Nov. 1865). Fseudohyalina conspecta, Tuyon, Amor. Journ. Conch., II. 265 (1866). Ilyalina conspecta, W. G. Binney, L. [& Sli., I. 41
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 122 TERRESTRIAL AIR-BREATHING MOLLUSKS. Fig. Z. conspectus, enlarged. equal to two sevenths the diameter of the shell; aperture ob- lujue, roundly lunate; peristome simple, strai<;ht, the margins approaehing, the columellar margin seareely dilated. Greater diameter 2, lesser 1| mill.; height, 1 mill. Helix conspecta, Bland, Ann. N. Y. Lye. VIII. 1(53, Fig. 7 (Nov. 1865). Fseudohyalina conspecta, Tuyon, Amor. Journ. Conch., II. 265 (1866). Ilyalina conspecta, W. G. Binney, L. [& Sli., I. 41 (1869). In the Pacific Province at San Francisco and Monterey, California. In the Central Province at Cunningham Gulch, Colorado. Z. conspectus differs from Patula asteriscus in having an elevated spire and a smaller umbilicus. The rib-like striiu are more numerous, but scarcely raised above the surface of the shell, which, under the microscope, is very similar to that of H. asteriscus. Z. exiguus also has very prominent ribs, but they are independent of the striae of gi'owth and run obli(|uely to them. Animal not observed. Zonites exiguus, Stimpson. Shell broadly umbilicated, depressed, pellucid, greenish horn-color, marked with delicate revolving lines, and distant longitudinal ribs obli(juely decus- sating the incremental striae; spire scarcely elevated, apex free from striae ; whorls 3^, convex, the last rounded, widely umbilicated below; aperture oblique, transversely rounded, remote from the axis; peristome simple, acute, its columellar extremity not reflected. Greater diameter, 2| mill.; height, \ mill. Fig. 40. Z. exiguus, enlarged. Helix exigua, Stimpson, Proc. Bost. Soc, III. 175 (1850). —Gould, T. M., III. 16.—W. G. Binney, T. M., IV. 102, PI. LXXVII. Fig. 19. — Pfeiffer, Mon. Hel. Viv., III. 102. —Morse, Amer. Nat., I. 543, Fig. 34 (1867). Helix annulata, Case in Sill. Journ. [2] 1847, III. 101, Figs. 1-3; Ann. and Mag. Nat. Hist. 1847, 338, — Pfei
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