. Principles of economic zoo?logy. Zoology, Economic. PELECYPODA 77. Oysters abound in quiet, shallow inlets of the Atlantic coast south of Cape Cod, and of the Gulf of Mexico. We have the best oysters in the world.' Our most extensive oyster-beds are on the Chesapeake Bay, at Baltimore, where they cover 3000 acres and furnish millions of bushels yearly. A\'e not only supply the markets of our own great cities, but send large quantities to British markets. Oysters are found also on the Pacific coast, on the coasts of Europe, of Australia, and of Japan. The scallop {Pecten) has an almost round,
. Principles of economic zoo?logy. Zoology, Economic. PELECYPODA 77. Oysters abound in quiet, shallow inlets of the Atlantic coast south of Cape Cod, and of the Gulf of Mexico. We have the best oysters in the world.' Our most extensive oyster-beds are on the Chesapeake Bay, at Baltimore, where they cover 3000 acres and furnish millions of bushels yearly. A\'e not only supply the markets of our own great cities, but send large quantities to British markets. Oysters are found also on the Pacific coast, on the coasts of Europe, of Australia, and of Japan. The scallop {Pecten) has an almost round, fluted shell with a straight hinge without teeth, and with unequal valves, one being more nearly flat than the other. The shell is usually brilliantly tinted. The foot is rudi- mentary or altogether lacking. The mantle- folds are fringed with slender tentacles and the edge of each lobe is set with a row of brilliant bluish " ; When at rest the scallop lies on the sea bottom with its one ad- ductor muscle relaxed and its shell open. If disturbed, it quickly closes the shell by con- tracting the strong muscle. This catches a quantity of water which is forcibly ejected through a round aperture at either end of the straight flange of the hinge. The reaction caused by forcing this water against the great body of water outside propels the animal for- ward. Thus, by rapidly opening and closing its shell, it swims through the water with comparative ease. The edible scallop (Pec'ten irra'dians) is about 21 inches in diameter and its color varies from a whitish to a reddish or purple hue. The adductor muscle is the portion used by man for food scallop is found on the Atlantic coast south of Cape Cod. Pec'len max'imus, found on the coast of Great Britain, in water 30 to 40 fathoms deep, is much larger. Its deeper shell was formerly used as a baking-dish for oysters, hence the origin of the term " scalloped oj'; The shell of another form common in the Medite
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1915
