A Manual of Conchology / According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.

by Thomas Wyatt

H. algira. The yellow Snail. Pl. [18], fig. 8.

Species shaped like a Planorbis, rough or hairy, more or less largely umbilicated, margin sharp.

H. Naticoides. The Natica-shaped Snail. Pl. [18], fig. 7.

Species ventricose.

H. obvoluta. The small white-lipped Snail. Pl. [18], fig. 9.

Species more or less depressed, umbilicated, Planorbis-shaped, the edges of the aperture thickened, callous, and even toothed.

H. conoides. The cone-shaped Snail. Pl. [18], fig. 4.

Species conoidal; the turns of the spire rounded.

H. pomatia. The edible Snail.

Species sub-globular, not umbilicated; the margin of the aperture thickened; aperture covered with a calcareous lid resembling an operculum.