. Bulletin - United States National Museum. Science. 82 A MANUAL OF AMERICAN LAND SHELLS. for the North American species of this genus, the typical Macrocydis being placed by him in the Relicidie. If he is correct in this latter point, Selenites must be adopted for our American species. Macrocydis Vancouv ereiisis, Lea. â Shell widely umbilicated, depressed, very slightly convex on the up- FiG. 44. per surface; epidermis light greenish-yellow; whorls 5, nearly flat above, protuberant and rounded on the lower surface, lines of growth very minute, with crowded, mi(;roscopic revolving striae, the
. Bulletin - United States National Museum. Science. 82 A MANUAL OF AMERICAN LAND SHELLS. for the North American species of this genus, the typical Macrocydis being placed by him in the Relicidie. If he is correct in this latter point, Selenites must be adopted for our American species. Macrocydis Vancouv ereiisis, Lea. â Shell widely umbilicated, depressed, very slightly convex on the up- FiG. 44. per surface; epidermis light greenish-yellow; whorls 5, nearly flat above, protuberant and rounded on the lower surface, lines of growth very minute, with crowded, mi(;roscopic revolving striae, the outer MacrocydisYancouverensis. ^,^^^j expanding a little towards the aperture; um- bilicus wide and deep; aperture transverse, somewhat rounded, flat- tened above by a depression of the peristome near its junction with the body-whorl, its edge tinged with rufous; peristome thin, acute, slightly reflected at the base of the shell, simple above, the two extremities approaching each other, and connected by a thin callus, which covers the columella. Greater diameter 31, lesser 26'«'^; height, 14'"'^. Helix concava, Binney, Bost. Journ. Nat. Hist., iii, 372, pi. xiv (1840), not of Say. Helix Vancouvertiisis, Lea, Am. Phil. Traus., vi, 87, pi. xxiii, fig. 72; Obs., ii, 87 (1839).âTroschel, ArcL. fur Nat., 1839, ii, 21.âDeKay, N. Y. Moll. ,45 (1843).âPfeiffer, Symbolae, ii, 41; Mon. Hel. Viv., i, 200; in Chemnitz, ed. 2, ii, 146, pi. xciv, figs, 21, 23.âBinney, Terr. Moll., ii, 1G6, pi. xx.âW. G. Binney, Terr. Moll., iv, 19.âGould, U. S. Expl. Ex., 36, fig. 37 (1852).â Eeeve, Con. Icon., No. 669 (1852). Helix vellicafa, Forbes, Proc. Zool. Soc. Lond. Mar. 1850, 75, pi. ix, fig. 1.âChem- nitz, ed. 2, ii, 454, pi. cliv, 42, 44.âReeve, Con. Icon., No. 673 (1852).â Pfeiffer, Mon. Hel. A^iv., iii, 155. MacTOcyclis J'^ancoMrerenjis, Tryon, Am. Journ. Conch., ii, 245 (1866).âW. G. Binney, L. & Sh., i, 54 (1869): Terr. Moll., V, 90. A species of the Pac
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