Fig- 

 is. T. MoNTABTJi, Gray. — f. s^Wa^as, Forbes. — Scarborough, Exmouth, 

 Cape Clear, etc., C. Elevated, whorls tumid. 



16. T. TUMiDUS, Mont. — T. patholatus, BackeUii, etc. Brit. co. gene« 



rally, C. Short, whorls tumid, umbilicated. 



17. T. ciNEEETJS, iwK. — T. Uneaf.us, T. perforatus, etc.' — Brit. co. 



generally, C. Littoral, small umbilicus. 



18. T. UMBILICATTJS, Mont. — T. cineraruis, etc. — Guernsey, S. and W. 



Brit. CO., C. Littoral, umbilicus large. 



19. T. MAJUS, Linn. — T. tnherculahis. — Brit. co. generally; littoral, C. 



Broad, tuberculated. Large umbilicus. 



20. T. LiNEATOS, Costa. — T. crassus, etc. — Channel Isls., Devon. W. 



Ire., Mc. Smooth, imperforate. 



Margarita, or Trochus. 



21. M. UNDiiLATTJS, Soioerly. — Twrho carnevs, 31. striata, etc. — Scot- 



land, 5 to 50 fath., Mc. Striated and undulated. 



22. M. HELTCiNUS, FaLricius. — Turlo and Trochis neritoideu.s, margarita, 



M. vulgaris, etc. — Many Brit. loc. ; littoral, C. 



23. M. PUsiLLUS, Jeffreys. — Lerwick, E., 10 to 40 fath. Minute, 



white, depressed. 



24. M. EXiLis, TJiil. — Skenea Cutleriana. — Guernsey, Skye, etc., R. 



Globose, striated. 



Adeorbis. 



25. A. SUBCARINATA, Mont. — [Helix] Trochns rugosiis, Cingula subc, 



etc. — S. Brit, co., Mr. Depressed, keeled. 



SCISSDRELLA. 



26. S. CRisPATA, i^/em-.^Zetland, etc., in sand, Mc. 



Phasianella. 



27. P. PULLUS, Linn, [Turbo.]— T. pictus, Cingida p., etc. — Brit. co. 



generally, C. 



