. West American shells; a description in familiar terms of the principal marine, fresh water and land mollusks of the United States found west of the Rocky Mountains, including those of British Columbia and Alaska ... )oint whether they are at all related,but as the general trend of modern research in-. Fio. no 134 WEST AMERICAN SHELLS clines in that direction they will be so classified inthis book. Var. nicklinidna, Lea. Shell minutely umbili-cated, rather thin, faintly indented and granu-lated; ash yellow with a chestnut band, lip white,reflexed at the base. Whorls six, spire moderatelyeleva
. West American shells; a description in familiar terms of the principal marine, fresh water and land mollusks of the United States found west of the Rocky Mountains, including those of British Columbia and Alaska ... )oint whether they are at all related,but as the general trend of modern research in-. Fio. no 134 WEST AMERICAN SHELLS clines in that direction they will be so classified inthis book. Var. nicklinidna, Lea. Shell minutely umbili-cated, rather thin, faintly indented and granu-lated; ash yellow with a chestnut band, lip white,reflexed at the base. Whorls six, spire moderatelyelevated. It lives near the coast of central Cali-fornia. Diameter one inch. Var. ramentosa, Gld. The surface of the shellis cut up into innumerable checks, which are shownby a lens to consist of little oblong grains, arranged))arallel to the lines of growth. The epidermis ofthe young ones is studded with little bristles. Dia-meter about three-fourths of an inch. This form isfound in Alameda County, Cal., and in adjacentregions. Var. diahloensis, J. G. Cooper, has a flattenedshell, umbilicated and thin, with regular mallea-tions arranged in revolving series, like dentscaused by the blows of a small hammer. Diameterrather less than an inch. From the Coast Moun-tains of central California, being named
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
