. Annals of the New York Academy of Sciences. Science. 816 New Species of Land Snail from California. XXVI.—Description of a New Species or Variety of Land Snail from California. BY ROBERT E. C. STEARNS. Read October 20th, 1879. Helix, variety circumcarinata, Stearns. Shell widely umbilicated, discoidal, flattened, angulated, with a peripheral keel; whorls six to six and a half, slightly tabulated near the sutures, which latter are deeply impressed; surface finely granulated, varying in different specimens; and otherwise sculptured by conspicuous subacute ribs parallel with the lines of growth
. Annals of the New York Academy of Sciences. Science. 816 New Species of Land Snail from California. XXVI.—Description of a New Species or Variety of Land Snail from California. BY ROBERT E. C. STEARNS. Read October 20th, 1879. Helix, variety circumcarinata, Stearns. Shell widely umbilicated, discoidal, flattened, angulated, with a peripheral keel; whorls six to six and a half, slightly tabulated near the sutures, which latter are deeply impressed; surface finely granulated, varying in different specimens; and otherwise sculptured by conspicuous subacute ribs parallel with the lines of growth both above and below, which meet, and sometimes cross, the peripheral keel; these ribs are more or less irregular and uneven, of varying prominence, and are also unequally spaced, being closely crowded in some places and farther apart in others. Aperture obliquely subangulate, semilunate; peristome moderately thickened, reflected somewhat, covering the open umbilicus, and made continuous by a connecting thin deposit of callus on the labium. Color, in some specimens, dingy white to white, in others a dingy reddish white, ornamented with a double revolving band,— the upper stripe being whitish, the lower reddish or light chestnut just above, and contiguous to the peripheral keel; the pinch or fold of the keel taking up what in Helix Mormonum is the third or lower stripe of white. Number of specimens four, two adult and two immature, but nearly full grown. Dimensions—Greater diameter, .92 to inch. Lesser " .75 to .86 " Height, .86 to .37 " Animal not 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 New York Academy of Sciences. New York, New York Academy of Sciences
Size: 1484px × 1683px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
