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From: Webster's Revised Unabridged Dictionary (1913)

 La·mel·li·bran·chi·a La·mel·li·bran·chi·a·ta n. pl.  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.
 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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