11. C. tuberculare, Mont. (Murex.)—Cerithium and Terebra t.—Brit. co. gen.; S. Eu.; 4 to 40 fath., Mc. Three rows of tubercles in the penultimate whorl.
12. C. Clarkii, Hanley.—Exmouth, Rr. Two rows of tubercles.
13. C. nivea, Jeffreys, Ann. Nat. Hist. 1859.—In shell sand, Belfast, R. Rather Buccinum-shaped.
14. C. metula, Lovén, (Cerithium.)—C. nitidum, Forbes.—Zetland, 50 to 80 fath., R. White, with angular whorls.
15. C. pulchella, Jeffreys.—Falmouth, Plymouth, Guernsey, R. Closely whorled and cancellated.
Scalaria.
16. S. communis, Lamk.—Turbo and Strombiformis clathrus and clathratus.—S. co. principally, C. Laminarian zone, S. Eu. Ridges raised; whorls separated.
17. S. grœnlandica, Chemn. (Turbo.)—S. planicostata, subulata.—Fragments only, N. Scotland, N. Eu. Grooved between ridges.
18. S. Turtonis, Turton.—Scarborough, Exmouth, Cork, etc., N. and S. Eu., R. as Brit. Ridges flat.
19. S. Trevelyana, Leach.—N. Brit., 15 to 85 fath., Mr. Thin, with ribs narrower than Sc. Turtonis.