. Bulletin - United States National Museum. Science. 84 A MANUAL Oy AMERICAN LAND SHELLS, cular, a little angular at base, modified by the preceding whorl; peris- tome acute, simple. Greater diameter, 12"^'"; height, 6"°^. Helix spor tell a, Gould, Proc. Bost. Soc. Nat. Hist., ii, 167 (184G); Moll. Ex. Ex., 37,* tig, 42 (1852); T. M., ii, 211, pi. xxii, a, fig. 1.—W. G. Binxey, Terr. Moll , iv, 19.—Pfeiffek, Mod. Hel. Viv., i, 111, v, 246 (1868).—Blaxd, Ann. N. Y. Lye, vii, 366; viii, 165. Macrocyclis sporiella, Tryo^, km. Journ. Concb., ii, 245 (1866).—W. G. Binney, L. & Fr
. Bulletin - United States National Museum. Science. 84 A MANUAL Oy AMERICAN LAND SHELLS, cular, a little angular at base, modified by the preceding whorl; peris- tome acute, simple. Greater diameter, 12"^'"; height, 6"°^. Helix spor tell a, Gould, Proc. Bost. Soc. Nat. Hist., ii, 167 (184G); Moll. Ex. Ex., 37,* tig, 42 (1852); T. M., ii, 211, pi. xxii, a, fig. 1.—W. G. Binxey, Terr. Moll , iv, 19.—Pfeiffek, Mod. Hel. Viv., i, 111, v, 246 (1868).—Blaxd, Ann. N. Y. Lye, vii, 366; viii, 165. Macrocyclis sporiella, Tryo^, km. Journ. Concb., ii, 245 (1866).—W. G. Binney, L. & Sh., i, 57(1869). From San Diego to Puget Sound in the neighborhood of the coast; confined to the Pacific Province. See remarks under M. Vancouverensis. In extreme forms of this species the revolving lines mark the whole surface, even in the umbilicus and in the interstices between the incre- mental striaB. Jaw and lingual membrane as usual in the genus, the latter resem- bling that of .1/. Vancouverensis. Teeth 22-1-22. Plate XY, Fig. K., of Terr. Moll., V. The central tooth is like that of last species. ]?IacrocycIis Voyana, Newcomb. Shell wiaely umbilicated, depressed, planorboid, thin, translucent, with delicate oblique strife of growth, and fine revolving lines, more de- nr. 47. veloped below, very light horn-color; spire scarcely ele- vated ; whorls 5, flattened, rapidly increasing, the last broad, flattened below, falling in front; umbilicus very large; aperture very oblique, removed from the axis, ir- regular truncatedly ovate; peristome thickened, subre- flected, flexuose, strongly depressed above and sinuate, ends approaching, connected with a stout, MacrocycU ana (Magnified twice.) ana. browuish, ridge like callus. Greater diameter 21, lesser Igmiu . height, 1" Helix (Macrocyclis) Foyana, Newcomb, Am. Journ. Conch., i. Part iii, 235, pi. xxv, fig. 4 (July, 1865). Helix Voyana, Pfeiffer, Men. V. 247 (1868). Afacrocyclis Voyana, Tryon, Am.
Size: 1211px × 2063px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
