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

by G. B. Sowerby

23. L. perspicua, Linn.—Helix, Bulla haliotoidea, Sigareta and Coriocella neritoideus.—Brit. co. generally, but R.; 1 to 15 fath., Mr. Thin, glassy, more ventricose than L. tentaculata.

24. L. tentaculata, Mont.—Sig. and Cor.—Falmouth, Swansea, Arran, etc. Laminarian, Mr. Upper whorls less full than L. perspicua.

Otina.

25. O. otis, Turt. (Helix.)—Velutina, Galericulum ovatum.—Wales, Devon, Channel Isls., Clare, etc., Mc. Littoral.

Trichotropis.

26. T. borealis, Broderip and Sowb.—T. and Murex carinatus, umbilicatus, acuminatus, etc.—N. Scotland, W. Ireland, 15 to 80 fath., R.

PLATE XVII.

Odostomia.