. 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 ... lethey do not seem to reproduce very successfully,it is certain that some of the young survive andgrow. More experiments in artificial propaga-tion are needed. We now come to a very different fam- /f^^ ily of moUusks, namely, the Carditidae. ^^^^^ Figure 25 gives a good idea of Cardita (Carditamera) subquadrdta, Cpr., the Little Heart-shell, (Lazaria subquadrata). The nam
. 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 ... lethey do not seem to reproduce very successfully,it is certain that some of the young survive andgrow. More experiments in artificial propaga-tion are needed. We now come to a very different fam- /f^^ ily of moUusks, namely, the Carditidae. ^^^^^ Figure 25 gives a good idea of Cardita (Carditamera) subquadrdta, Cpr., the Little Heart-shell, (Lazaria subquadrata). The name is very much longer than the shell, of which the picture is even too large. It has a firm, hard little shell, however, and can easily be identified by the strong ribs which radiate from one corner. Color, brownish-white, the inside sometimes stained with purple. It may sometimes be found alive, attached to stones, while dead specimens are often washed up with the gravel on the beach. In Figure 26 wehave a life size pic-ture of the insideof the right valveof Calyptogena pa-rifica, Dall, the Pa-cific Calypto. The outside of the shell pj^ 26, (*) is nearly smooth,being marked only by lines of growth, though the. OYSTERS AND SMALL CLAMS 47
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
