splendida. H. crenulata. H. planorbula. H. macularia. H. maritima. H. strigata. H. muralis. H. rugosa. H. cornea. H. linguifera. H. incarnata. H. cinctella. H. cellaria. H. nitida. H. obvoluta. H. Cookiana. H. pileus. H. papilla. H. punctifera. H. plicatula. H. planorbella. H. scabra. H. cariosa. H. plebeium. H. personata. H. hispida. H. rotundata. H. apicina. H. striata. H. conspurcata. H. conica. H. conoidea. H. pulchella. _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. _H. nitida._ The pellucid Snail. Species depressed, more or less largely umbilicated; the edges sharp, but always thin and shining. _H. nemoralis._ The grove Snail. Species imperforated, semi-globular, thin, and sub-pellucid; not umbilicated, with a light inflexion at the place of the junction of the columella with the margin of the aperture; colour various, inner margin white or reddish brown; volutions five, with several dark brown bands. _H. Carthusiana._ The Carthusian Snail. Species sub-depressed, sub-umbilicated, with a sharp edge, thickened within by a roll. _H. arbustorum._ The orchard Snail. Sub-globular, sub-pellucid, sub-umbilicated, five volutions, finely striated longitudinally; mottled with greenish yellow, streaked with deep chestnut, a broad brown band commonly at the edge of the outer lip, and running round through the volutions to the apex. 2. Carocolla. Eighteen species.