The type-genus Cladonema (fig.
Uropeltis grandis, the only species of the type-genus, is confined to Ceylon; about 18 in.
The molars are less completely selenodont than in the type genus.
The larval forms of the type genus Cerianthus float freely in the sea, and were once considered to belong to a separate genus, Arachnactis.
The type-genus Botryopteris, represented in the Permo-Carboniferous of France and in both the Lower and Upper Carboniferous of Great Britain, had a rhizome, with a very simple monostelic structure, bearing spirally arranged compound leaves, with lobed pinnules, probably of a somewhat fleshy texture.
Peripatus, the type-genus of the class Onychophora, stands at the base of the series with only a single prosthomere (fig.
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