Illustrated Index of British Shells / Containing figures of all the recent species

by G. B. Sowerby

11. O. cylindrica, Alder.—Turbo nivosus?—S. Devon, Ilfracombe, Guernsey, Cork, R. Cylindrical, few whorls.

12, 13. O. eulimoides, Hanley.—O. crassa, O. pallida (var. f. 13), O. notata.—Brit. co. generally. Coralline zone, Mr. Ample body-whorl.

14. O. dubia, Jeffr.—S. Devon, Lerwick, Guernsey, Mr. Rather large body-whorl.

15, 16. O. alba, Jeffreys, (and var.)—Swansea, Skye, Zetland, Guernsey, Mr. Thin, whorls rounded.

17. O. nitida, Alder.—S. Devon. Littoral, Mc. Aperture differently formed from No. 17.

18. O. Lukisii, Jeffreys, Ann. Nat. Hist. 1859.—Guernsey. Sublittoral and coralline, Mc. Whorls tumid; a slight umbilicus.

19. O. glabrata, Muhlfeldt, (Helix.)—Rissoa punctulum, etc.—Zetland, R. Pillar-lip thin, arched.

20. O. rissoides, Hanley.—O. scalaris.—Channel Isls., Devon, Cornwall, Tenby, etc., Mc. Thin, conical, no umbilicus.

21. O. albella, Lovén.—O. rissoides, var., B. M.—Guernsey, S. Devon, etc. Turreted, upper whorls more cylindrical than No. 20.

22. O. obliqua, Alder.—Tynemouth, Guernsey, 7 fath. to deep water, Rr. Thin, oblique.