. 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 ... idea incisa,) belongs to southern waters, and is notcommon. The shell has strong, rounded, trans-verse ridges, which give the spire the appearanceof being chopped full of holes. The color is white,with cross stripes of brown, and its length is aninch and a quarter. Figure 19 9gives an excel-lent idea of arare shellnamed Trophont r iangu I dtus,Gpr., the Three-cornered Tro-phon. T
. 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 ... idea incisa,) belongs to southern waters, and is notcommon. The shell has strong, rounded, trans-verse ridges, which give the spire the appearanceof being chopped full of holes. The color is white,with cross stripes of brown, and its length is aninch and a quarter. Figure 19 9gives an excel-lent idea of arare shellnamed Trophont r iangu I dtus,Gpr., the Three-cornered Tro-phon. The shellis quite large,but is of lightweight, owing tothe extremethinness of thevarices. It isFs 199 reddish brown in color though nearly white internally. Wlien ex-amined closely it seems to be almost wholly madeup of wings, and one wonders somewhat where theanimal found internal space enough to carry onbusiness. The original young specimen fromwhich the species was named was dredged from thevicinity of Catalina Island, and was less than halfan inch long. Adult specimens of the size of thecut have recently been dredged in considerablenumbers in the vicinity of San Pedro, and a fewhave been found on the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
