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Planarian, plā-nā′ri-an, adj. and n. a term practically coextensive with Turbellarian, applicable to the members of the lowest class of worm-like animals, living in fresh and salt water, and sometimes in damp earth.—adjs.

Rhabdite, rab′dīt, n. a smooth, rod-like structure found in the cells of the integument of most turbellarian worms: one of the hard parts composing the ovipositor of some insects.—adj.

Rhabdocœla, rab-dō-sē′la, n. a prime division of turbellarian worms.—adjs.

According to his view, a simple early Turbellarian larva, such as that of Stylochus, most nearly represents for us to-day that ancestor from which Ctenophora and Turbellaria are alike derived.

The male is about a hundred times smaller than the female, in the respiratory chamber of which it lives as a kind of parasite, and appears, so far as outward shape goes, more like a turbellarian than a gephyrean.