Illustrated Index of British Shells / Containing figures of all the recent species

by G. B. Sowerby

Unio. Fresh-water Mussel with hinge-teeth.

Fig.

01. U. margaritiferus, Linn. (Mya.)—Alasmodon m., A. arcuata, U. elongata, U. sinuata.—R. Conway; rivers in Cumberland, Wales, Ireland, etc., Mc. Long, thick, arched.

02. U. pictorum, Linn. (Mya.)—U. ovalis, U. rostrata, U. limosus, U. Deshayesii, etc.—Various British rivers, C. Long, oval, not wedge-shaped behind.

03. U. tumidus, Retz.—Mya and Unio ovalis, M. depressa, M. ovata, Myscei o., M. solida.—Thames, and various British rivers, C. More solid, deep, and wedge-shaped than U. pictorum.

Anodonta. Fresh-water Mussel, without teeth.

04. A. cygnea, Linn. (Mytilus.)—M. anatinus, M. stagnalis, M. paludosa, Symphonota cy.—Britain and Europe generally, in rivers and canals, C.

Dreissina, Beneden.

05. D. polymorpha, Pallas, (Mytilus.)—London Docks, Edinburgh Canal, C.

Modiola, Lamarck.