| Mollusca (mollusca) |
|---|
| n. pl. | (?) |
|---|
| ||Mol*lus"ca |
| [NL. See
Mollusk.] (Zoöl.) |
One of the grand divisions
of the animal kingdom, including the classes Cephalopoda, Gastropoda,
Pteropoda, Scaphopoda, and Lamellibranchiata, or Conchifera. These
animals have an unsegmented bilateral body, with most of the organs
and parts paired, but not repeated longitudinally. Most of them
develop a mantle, which incloses either a branchial or a pulmonary
cavity. They are generally more or less covered and protected by a
calcareous shell, which may be univalve, bivalve, or
multivalve.
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In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 