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The Collaborative International Dictionary of English v.0.48 (gcide)

Pelecypoda \Pel`e*cyp"o*da\, n. pl. [NL., fr. Gr. pe`lekys a
hatchet -poda.] (Zool.)
Same as {Lamellibranchia}.
[1913 Webster]


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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