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

by G. B. Sowerby

20. T. rudis, Phil. (Fusus.)—Murex r., Jeffreys.—Tenby; unique as British. Whorls and ribs rounded.

21. T. muricatus, Mont.—Fusus and Murex m.—Brit. co. generally, Channel Isls., 15 to 50 fath., Mr. Whorls angular, ribs intersected.

22. T. scalariformis, Gould.—Belfast, in sand, Rr. Ribs smooth.

23. T. clathratus, Linn. (Murex.)—Tritonium, Fusus, and Pleurotoma Bamfius.—Irish sea, Zetland, Mc. Ribs laminated.

24. T. barvicensis, Johnston.—Fusus and Tritonium b.—Hebrides, Cork, Northumberland, 60 fath., Mr. Ribs aculeated.

PLATE XIX.

Nassa.

Fig.