贝壳类

[ noun ]
a mussel with a dark shell that lives attached to rocks
<noun.animal>

Mussel \Mus"sel\, n. [See {Muscle}, 3.]
1. (Zo["o]l.) Any one of many species of marine bivalve
shells of the genus {Mytilus}, and related genera, of the
family {Mytid[ae]}. The common mussel ({Mytilus edulis};
see Illust. under {Byssus}), and the larger, or horse,
mussel ({Modiola modiolus}), inhabiting the shores both of
Europe and America, are edible. The former is extensively
used as food in Europe.

2. (Zo["o]l.) Any one of numerous species of {Unio}, and
related fresh-water genera; -- called also {river mussel}.
See {Naiad}, and {Unio}.

{Mussel digger} (Zo["o]l.), the grayback whale. See {Gray
whale}, under {Gray}.