T. Haliotidea. The Haliotis-shaped Testacella. Pl. [17], fig. 6.
Answering to the above description; very thin, transparent, and yellowish.
5. Vitrina. One species.
Shell proportionally very small, extremely thin, pellucid, almost membranous, oval or sub-globular; spire very short, of which the last whorl is very large; aperture large, semilunar; the edges sharp; the left edge arched, and extending itself interiorly to the summit.
V. pellucida. The pellucid Vitrina. Pl. [17], fig. 3.
Extremely thin, pellucid, and glossy; depressed, spire very short; aperture large and oval; colour pale yellowish green.
FAMILY VII.
Colimacea. Eleven genera.
1. Helix. The Snail. One hundred and seven species.
According to the systematic arrangement of Lamarck, this genus now consists of shells with peculiar characteristic distinctions.
By Linnæus, marine, land, and fresh-water shells were united in this genus, and so confounded that the naturalist would often look in vain for the distinguishing characters which would enable him to class and determine the genus of the object under examination.