M. Galloprovincialis.

M. angustanus.

M. lineatus.

M. lacunatus.

M. canalis.

M. incurvatus.

M. abbreviatus.

M. incurvatus. The incurvated Mytilus.

Nearly smooth, elongated oval, valves inflated and curved near the ligament; apex acute.

M. Afer. The African Mytilus.