. a-j Fig. 19.—Some British Marine Bivalve Molluscs. which bores into chalk, clay, The smaller Piddock, Pholas parva, and hard rock. Natural size. The Razor-shell, Solen siliqua. The muscular foot is seen protruding from the shell. One-third the natural size, linear. Venus verrucosa. Natural size. Cardium echinatum. Two-thirds the natural size, linear. Pinna pectinata, the " cappy ; One-fifth of the natural size, linear. " make up " the beach, yet there are not so very many Molluscs which live commonly on the shore between tide- marks. The shells which are accumulated
. a-j Fig. 19.—Some British Marine Bivalve Molluscs. which bores into chalk, clay, The smaller Piddock, Pholas parva, and hard rock. Natural size. The Razor-shell, Solen siliqua. The muscular foot is seen protruding from the shell. One-third the natural size, linear. Venus verrucosa. Natural size. Cardium echinatum. Two-thirds the natural size, linear. Pinna pectinata, the " cappy ; One-fifth of the natural size, linear. " make up " the beach, yet there are not so very many Molluscs which live commonly on the shore between tide- marks. The shells which are accumulated as shell- beaches have come from animals which lived in quantity at depths of ten or twenty fathoms, whence they can be brought up alive by the dredge. There are, however, certain bivalves and certain univalves which are com- monly to be found in the living state between tide-marks. !
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
