09. T. conulus, Linn.—Lincolnshire, Rr. More simply conical than the most extreme forms of T. zizyphinus.
10. T. alabastrum, Beck.—T. formosus.—Zetland, Lerwick, etc., 45 to 80 fath., R. White, with deep, plain, and beaded ridges.
11. T. millegranus, Philippi.—T. Clealandi, T. Martini.—Brit. co. generally, 15 to 90 fath., Mr. Granulated, whorls with prominent margin.
12. T. granulatus, Born.—T. papillosus, T. fragilis.—Channel Isls., Weymouth, Dublin, etc., R. Like 8, but grained.
13. T. striatus, Linn.—T. parvus, etc.—S. Brit., C. More finely ribbed than T. exiguus.
14. T. exiguus, Pult.—T. exasperatus, minutus, etc. S. co., C.
15. T. Montagui, Gray.—T. striatus, Forbes.—Scarborough, Exmouth, Cape Clear, etc., C. Elevated, whorls tumid.
16. T. tumidus, Mont.—T. patholatus, Rackettii, etc. Brit. co. generally, C. Short, whorls tumid, umbilicated.
17. T. cinereus, Linn.—T. lineatus, T. perforatus, etc.—Brit. co. generally, C. Littoral, small umbilicus.
18. T. umbilicatus, Mont.—T. cinerarius, etc.—Guernsey, S. and W. Brit. co., C. Littoral, umbilicus large.