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One of the Rotifera. See Illust. in Appendix.

An order of minute worms which usually have one or two groups of vibrating cilia on the head, which, when in motion, often give an appearance of rapidly revolving wheels. The species are very numerous in fresh waters, and are very diversified in form and habits.

ch many immature entozoans exit in the tissues of living animals; also, a similar form in Rotifera, etc.

One of a group of stalked rotifers, having ciliated tentacles around the lobed disk.

a on the ventral side. The group is regarded as an ancestral or synthetic one, related to rotifers and annelids.

The central portion of the armature of the pharynx in the Rotifera.

A peculiar genus of rotifers, remarkable for the absence of ciliated disks. By some zoölogists it is thought to be like the ancestral form of the Arthropoda.

The protective case or shell of an infusorian or rotifer.

One of the hard lateral pieces of the mastax of Rotifera. See Mastax.

The pharynx of a rotifer. It usually contains four horny pieces. The two central ones form the incus, against which the mallei, or lateral ones, work so as to crush the food.

A permanent colony of cells or plastids which may remain isolated, like Rotifer, or may multiply by gemmation to form higher aggregates, termed zoides. Perrier.

Same as Rotifera.

A rotifer. [R.] Kirby.

Resembling a wheel. Trochal disk (Zoöl.), the cephalic disk of a rotifer. It is usually surrounded by a fringe of cilia.

Mechanical. -- Wheel animal, or Wheel animalcule (Zoöl.), any one of numerous species of rotifers having a ciliated disk at the anterior end. -- Wheel barometer. (Physics) See under Barometer. -- Wheel boat, a boat with wheels, to be used either on water or upon inclined planes or railways. -- Wheel bug (Zoöl.), a…