Fig. 



15. F. norvegtcus, Chemn. (Strotnbus.) — Tritonium n.~— Scarborough, 



Durham, Rr. Oval, smooth, with large aperture. 



16. F. antiquus, Linn. {Murex.) — M., B., and Tritoniwm despectus, 



contrarius, carinatus, babylonicus, etc. — -Various Brit, co., 5 to 

 30 fath., C. 



17. F. tslandicus, Chemn. — Murex cornens, Tritonium gracile, etc. — 



Brit. co. generally; 5 to 80 fath. ; N. Eu., C. (See F. propinquus.) 



18. F. Turtoni, Bean. — Yorkshire, Northumberland, 60 fath., Rr. 



1 9. F. propinquus, Alder. — F. corneus and tslandicus, var. — N. Scot- 



land, Bantry Bay, Northumberland, deep water, Mr. Shorter 

 than F. islandicus, with deep suture and symmetrical spire. 



Tuophon. 



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 inter- 

 sected. 



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



23. T. clathratus, Linn. {Murex.) — Tritonium; Ftcsus, and Pleurotoma 



Bamjius. — Irish sea, Zetland, Mc. Ribs laminated. 



24. T. barvicensis, Johnston. — Fusus and Tritonium b. — Hebrides, 



Cork, Northumberland, 60 fath., Mr. Ribs aculeated, 



