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The protective case or shell of an infusorian or rotifer.

The Infusoria.

The Infusoria.

One of the smallest flangellate Infusoria; esp., the species of the genus Monas, and allied genera.

The Infusoria.

A genus of minute flagellate Infusoria of which there are many species, both free and attached. See Illust. under Monad.

A contractile striated layer found in the bodies and stems of certain Infusoria.

A division of Infusoria including the Noctiluca. See Noctiluca.

A genus of marine flagellate Infusoria, remarkable for their unusually large size and complex structure, as well as for their phosphorescence. The brilliant diffuse phosphorescence of the sea is often due to myriads of Noctilucæ.

A division of ciliated Infusoria having a circle of cilia around the oral disk and sometimes another around the body. It includes the vorticellas. See Vorticella.

The influence of light on the movements of low organisms, as various infusorians, the zoöspores of certain algæ, etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed positive phototaxis; if away f…

Same as Infusoria.

Same as Infusoria.

The Infusoria. [Obs.]

A transparent body found in the chromatophores of certain Infusoria.

A dicyemid which produces infusorialike embryos; -- opposed to nematogene. See Dicyemata. [Written also rhombogen.]

means of adjustment; -- also called shoe, and gib. Slipper animalcule (Zoöl.), a ciliated infusorian of the genus Paramecium. -- Slipper flower.(Bot.) Slipperwort. -- Slipper limpet, or Slipper shell (Zoöl.), a boat shell.

Any species of ciliated Infusoria belonging to the genus Stentor and allied genera, common in fresh water. The stentors have a bell-shaped, or cornucopia-like, body with a circle of cilia around the spiral terminal disk. See Illust. under Heterotricha.

stlelike organ; as, the caudal stylets of certain insects; the ventral stylets of certain Infusoria.

An order of Infusoria having the body armed with somewhat stiff, tubular processes which they use as suckers in obtaining their food. They are usually stalked.