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

by G. B. Sowerby

Diodonta.

16. D. fragilis, Linn.—(Tellina) Psammobia f., Tellina jugosa and ochroleuca.—Dublin, Tenby, Weymouth, R. Oval or wedge-shaped.

16*. D. Barleei, Jeffr.—Arran, Rr. Minute, subquadrate.

Solecurtus.

17. S. coarctatus, Gmel.—S. cultellus, S. emarginatus, S. antiquatus, etc.—Torbay, Anglesea, Man, Skye, etc., R. Oblong, smooth.

18. S. candidus, Renieri.—(Solen) S. strigilatus, Turt., not Linn., Psammobia scopula.—S. Devon, Dublin, etc., R. Striated.

Syndosmya.

19. S. prismatica, Mont.—(Ligula) Mya and Amphidesma p.—Weymouth, Forth, Dublin, Antrim, etc., littoral, Mc. More pointed and narrow than S. intermedia.

20. S. tenuis, Mont.—(Mactra) Amphidesma t.—Dorset, Scarborough, Antrim, etc., 5 to 100 fath., Mc. Short, subtrigonal.

21. S. intermedia, Thompson.—Mya and Syndosmya nitida, Abra profundissima.—In mud, 6 to 100 fath., Zetland, Skye, Cape Clear, etc., R. Broader and more pointed than S. prismatica.