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

by G. B. Sowerby

Fig.

01. T. navalis, Linn.—T. Batavæ.—Herne Bay, R. Pallets shelly, crescented; valves with auricles extended sidewise; tube long.

02. T. norvegica, Spengl.—T. Bruguieri.—Port Patrick, Teignmouth, etc., Mc. Pallets shelly, not crescented; auricles not extended.

03. T. megotara, Hanl.—T. nana (young).—Herne Bay, Devon, Swansea, etc., R. Pallets shelly, spade-shaped; auricles raised and expanded.

04. T. bipennata, Turt.—Ireland, Scarborough, etc., R. Pallets horny, long; auricles lobed.

05. T. malleolus, Turt.—Torquay, Rr. Pallets shelly, mallet-shaped; valves narrow.

06. T. palmulata, Lamk.—T. bipalmulata.—Floating wood, Ire., S. Eng. Pallets horny, short; valves small, shaped like T. navalis.

Xylophaga. In fixed and floating timber.

07. X. dorsalis, Turt.—Ayrs., Dubl., Exm., Scarb., etc., C. Two dorsal plates, no tube, no pallets.

Pholas. Pierces and inhabits stone.