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Any marine bivalve shell of the genus Mactra, and allied genera. Many species are known. Some of them are used as food, as Mactra stultorum, of Europe. See Surf clam, under Surf.

open seacoast, especially those of the family Mactridæ, as the common American species. (Mactra, or Spisula, solidissima); -- called also beach clam, and surf clam.

o the turnstone. -- Surf clam (Zoöl.), a large clam living on the open coast, especially Mactra, or Spisula, solidissima. See Mactra. -- Surf duck (Zoöl.), any one of several species of sea ducks of the genus Oidemia, especially O. percpicillata; -- called also surf scoter. See the Note under Scoter. -- Surf fish (Z…

Any bivalve shell of the genus Mactra. See Mactra.