Fig. 



15. F. NORVEGicus, Chemn. [Stromhns) — Tritonium n. — Scarborough, 



Durhnm, Kr. Oval, smooth, with large aperture. 



16. r. AXTiQUus, Linn. (Murex.) — 31., B., and Tritonium despectus, 



contrariiis, carinatus, bahylonicus, etc. — Yarious Brit, co., 5 to 

 30 fath., G. 



17. F. iSLAXDicus, Chetnn. — Murex cornevs, 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. 



] 9. F. PKOpixQuus, Alder. — F. corneus and islandicus, var. — N. Scot- 

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

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



TUOPHON. 



20. T. RUDis, PMl. (Flaws.) — Murex r., Jeffreys. — Tenby; unique as 



British. Whorls and ribs rounded. 



21. T. JiUEiCATus, Mont. — Fusns and Murex in. — Brit. co. generally, 



Channel Isls., 15 to 50 fath., Mr. Whorls angular, ribs inter- 

 sected. 

 2i. T. scALARiFOKMis, Gould. — Belfast, in sand, Rr. Ribs smooth. 



23. T. CLATHKATOS, Linn. [Murex.]— Tritormim, Fusiis, and Pleurotoma 



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



24. T. BARViCENsis, Jo/mston. — Fusus and Tritoniuin b. — Hebrides, 



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



