Mytilidae

Modiola modiolus.

Mytilus edula, rayed-color variety.

Modiola nigra.

Mytilus californianus, the Large Sea Mussel (Upper); Mytilus edulis, the Smaller Sea Mussel (Lower).

Mytilus hamatus.

Horse Mussel, Modiola modiolus.

Mytilus edulis, attached by its byssus (By) to a piece of wood: F, food; S, exeurrent siphon, the branchial siphon being below it and not closed.

Two valves of Mytilus edulis L., representing diagramatically, the approximate position of the holes bored by Purpura in about 100 specimens of Mytilus gathered at Newquay, Cornwall.

Mytilus edulis L., attached by its byssus (By) to a piece of wood; F, foot; S, anal siphon, the branchial sipohon being below it and not closed.

Sea-mussel (Mytilus edulis Linnaeus).

Mytilus edulis, Edible mussel.

Mytilus edulis.

Sea mussel Mytilus edulis Linnaeus, showing foot distended and attachment by byssus.

Mytilus edulus (Linnaeus).

Modiola plicatula, typical form.