From The Collaborative International Dictionary of English v.0.48:

Lamellibranchia \La*mel`li*bran"chi*a\, Lamellibranchiata
\La*mel`li*bran`chi*a"ta\, n. pl. [NL. See lamella, and
   Branchia, Branchiate.] (Zool.)
   An earlier name for the class of Mollusca including all those
   that have bivalve shells, as the clams, oysters, mussels,
   etc., now called Pelecypoda or Bivalvia.
   [1913 Webster +PJC]

   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.
         [1913 Webster]
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