The existence of a division of the genus Planaria, which inhabits the dry land, interested me much.

These animals are of so simple a structure, that Cuvier has arranged them with the intestinal worms, though never found within the bodies of other animals.

Numerous species inhabit both salt and fresh water; but those to which I allude were found, even in the drier parts of the forest, beneath logs of rotten wood, on which I believe they feed.

In general form they resemble little slugs, but are very much narrower in proportion, and several of the species are beautifully coloured with longitudinal stripes.

Their structure is very simple: near the middle of the under or crawling surface there are two small transverse slits, from the anterior one of which a funnel-shaped and highly irritable mouth can be protruded.