AcephalaA*ceph"a*la\, n. pl. [NL., fr. Gr. ?, adj. neut. pl., headless. See Acephal.] (Zo["o]l.) That division of the Mollusca which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca.
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