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One of the feeding zooids, or polyps, of a coral, hydroid, or siphonophore; a hydranth. See Illust. of Campanularian.

One of the individual zooids forming the compound organism of a polyzoan.

in the warmer parts of the ocean. The individuals are round and disk-shaped, with a large zooid in the center of the under side, surrounded by smaller nutritive and reproductive zooids, and by slender dactylozooids near the margin. The disk contains a central float, or pneumatocyst.

To produce zooids by budding.

The production of numerous zooids by budding, especially when buds arise from other buds in succession.

Producing sexual zooids by budding; -- said of the blastostyle of a hydroid.

A single zooid of a compound protozoan.

Consisting of a single individual or zooid; as, a simple ascidian; -- opposed to compound. Simple contract (Law), any contract, whether verbal or written, which is not of record or under seal. J. W. Smith. Chitty. -- Simple equation (Alg.), an eqyation containing but one unknown quantity, and that quantity only in the…

rozoa including species which form complex free-swimming communities composed of numerous zooids of various kinds, some of which act as floats or as swimming organs, others as feeding or nutritive zooids, and others as reproductive zooids. See Illust. under Physallia, and Porpita.

An asexual zooid, usually forming one of a series of larval forms in the agamic reproduction of various trematodes and other parasitic worms. The sporocyst generally develops from an egg, but in its turn produces other larvæ by internal budding, or by the subdivision of a part or all of its contents into a number of mi…

The growth or development of an animal or a zooid from a nonsexual germ.

A hydrozoan reproductive zooid or gonophore which does not become medusoid in form or structure. See Illust. under Athecata.

ument of the body, or of the body wall, from which buds are developed, giving rise to new zooids, and thus forming a compound animal in which the zooids usually remain united by the stolons. Such stolons are often present in Anthozoa, Hydroidea, Bryozoa, and social ascidians. See Illust. under Scyphistoma.…

One of the stellate or irregular clusters of intimately united zooids which are imbedded in, or scattered over, the surface of the common tissue of many compound ascidians. Block system, Conservative system, etc. See under Block, Conservative, etc.

One of a peculiar kind of zooids situated on the polyp-stem of certain Siphonophora. They somewhat resemble the feeding zooids, but are destitute of mouths. See Siphonophora.

The nutritive zooids of a hydroid, collectively, as distinguished from the gonosome, or reproductive zooids.

parts with which certain bryozoans are furnished. They are regarded as specially modified zooids, of nearly the same nature as Avicularia.

The zooids of a compound anthozoan, collectively.

A genus of Actinaria, including numerous species, found mostly in tropical seas. The zooids or polyps resemble small, elongated actinias united together at their bases by fleshy stolons, and thus forming extensive groups. The tentacles are small and bright colored.

One of the cells or tubes which inclose the feeling zooids of Bryozoa. See Illust. of Sea Moss.