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From: Webster's Revised Unabridged Dictionary (1913)

 A·ceph·a·la n. pl.  Zool. 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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