n. pl. - 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.
n. pl. - 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.