1. (n.) Any one of many species of marine bivalve shells of the genus Mytilus, and related genera, of the family Mytidae. 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. (n.) Any one of numerous species of Unio, and related fresh-water genera; -- called also river mussel. See Unio.

Chilopoda Chordata Dungeness crab Echiuroidea Ectoprocta Entoprocta Japanese crab Laconian Monoplacophora Nemertinea Phoronidea Spartan angle bait the hook blue point bob coquillage crab crawdad crawfish crayfish dap dib dibble drive fish fly-fish gig go fishing grig guddle jack jacklight jig laconic langouste limpet littleneck clam lobster mussel net oyster periwinkle prawn quahog scallop seine shellfish shrimp snail soft-shell crab spin steamer still-fish torch trawl troll whale whelk