4. Genus Anostoma. Pl. [X].
Animal. See Helix.
Shell. Somewhat extraordinary in its formation, orbicular, the spire convex and obtuse, aperture round, dentated grinning, turned upwards to the side of the spire, margin of the lip reflected. Lakes in America and the Sandwich Islands. Three species.
- Anostoma dentata.
- Anostoma depressa.
- · · · · ·
- A. globosa.*
5. Genus Helicina. Pl. [X].
Animal. See Helix.
Shell. Terrestrial, distinguished only from the Helix by its columella being transverse callous; much depressed and diminished in thickness at the lower part, subliglobular, imperforate; aperture entire, demioval, margin acute, forming an angle at the lower base of the right lip; operculum corneous. Inhabits groves in Europe. Nineteen species.
- Helicina neritella.
- H. rhodostoma.
- H. striata.
- H. fasciata.
- H. virida.
- H. pulchella.
- H. substriata.
- H. Braziliensis.
- H. costata.
- H. aurantia.
- H. major.
- H. minima.
- H. submarginata.
- H. unifasciata.
- H. Brownii.
- H. depressa.
- H. aureola.
- H. orbiculata.
- H. Tankervillii.
6. Genus Pupa. Pl. [X].
Animal. See Helix.