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.
Source: Webster's Revised Unabridged Dictionary (1913)
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Acephala \A*ceph"a*la\, n. pl. [NL., fr. Gr. ?, adj. neut. pl.,
headless. See Acephal.]
(Zo["o]l.)
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.
Source: Webster's Revised Unabridged Dictionary (1913)
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