. 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 ... Theshell is shining, with a thin epidermis covered withminute spiral lines, and tubercles. The apertureis three-lobed, and the umbilicus is partly coveredby the lip. Shell dark horn-colored, diameter halfan inch. There are several varieties which willbe noticed in the List. Polygyra loricdta, Gld., the Mailed Snail, (Trio-dopsis loricata), has a little shell only a quarter ofan i
. 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 ... Theshell is shining, with a thin epidermis covered withminute spiral lines, and tubercles. The apertureis three-lobed, and the umbilicus is partly coveredby the lip. Shell dark horn-colored, diameter halfan inch. There are several varieties which willbe noticed in the List. Polygyra loricdta, Gld., the Mailed Snail, (Trio-dopsis loricata), has a little shell only a quarter ofan inch in diameter, but its five and a half whorlsare very distinct. The umbilicus is small but deep,and the spire low dome-shaped. Aperture irregu-lar, with white tooth on the columella and twothickened spots on the outer lip; surface horn-colored. Found in California near San Francisco,and also in the Sierras. Polygyra c h i r i c a - Ji liana,DrW, the Chirica- iEKk. \ \Z> i % W ^«...^iBP^ ^ h u a n a Snail, isshown in amuch m a g- (*) j^igg^ ^ in Figure 115. The shell is depressed, thin, pol-ished, and of a dark brownish color. The lip isstrongly reflected and the aperture is destitute of. 140 WEST AMERICAN SHELLS
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
