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

by G. B. Sowerby

23. M. subtruncata, Costa.—M. lactea, M. triangula, M. crassatella.—Brit. co. generally, C. Obliquely cuneiform.

24. M. helvacea, Chemn.—M. glauca, M. neapolitana.—Odd valves found dead in Cornwall, R. Large, obliquely oval.

25. M. solida, Linn.—Trigonella zonaria and gallina.—Brit. co. generally, C. Trigonal, thick.

26. M. truncata, Mont.—Forth, Cork, Cornwall, etc., C. Trigonal, deep, thick.

PLATE IV.

Lutraria. Inhabits mud.

Fig.

01. L. intermedia?, Sowb.—Perhaps only the young of L. elliptica.