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Lamellibranchiata

Source : Webster's Revised Unabridged Dictionary (1913)

Lamellibranchia \La*mel`li*bran"chi*a\, Lamellibranchiata
\La*mel`li*bran`chi*a"ta\, n. pl. [NL. See {lamella}, and
   {Branchia}, {Branchiate}.] (Zo["o]l.)
   A class of Mollusca including all those that have bivalve
   shells, as the clams, oysters, mussels, etc.

   Note: They usually have two (rarely but one) flat,
         lamelliform gills on each side of the body. They have
         an imperfectly developed head, concealed within the
         shell, whence they are called {{Acephala}}. Called also
         {Conchifera}, and {Pelecypoda}. See {Bivalve}.
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