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The common tissue which unites the polyps or zooids of a compound anthozoan or coral. It may be soft or more or less ossified. See Coral.

The common tissue which unites the various zooids of a bryozoan.

r of rhizopods which generally have a chambered calcareous shell formed by several united zooids. Many of them have perforated walls, whence the name. Some species are covered with sand. See Rhizophoda.

The bell of a sessile gonozooid.

A sexual zooid produced as a medusoid bud upon a hydroid, sometimes becoming a free hydromedusa, sometimes remaining attached. See Hydroidea, and Illusts. of Athecata, Campanularian, and Gonosome.

The reproductive zooids of a hydroid colony, collectively.

One of the nutritive zooids of a hydroid colony. Also applied to the proboscis or manubrium of a hydroid medusa. See Illust. of Hydroidea.

cluding those genera that secrete a stony coral, as Millepora and Stylaster. Two forms of zooids in life project from small pores in the coral and resemble those of other hydroids. See Millepora.

One of the flat, leaflike, protective zooids, covering other zooids of certain Siphonophora.

All the zooids of a hydroid colony collectively, including the nutritive and reproductive zooids, and often other kinds.

An independent, or partially independent, zooid of a compound animal.

The quality of having similar sexual zooids or gonophores and dissimilar hydrants; -- said of certain hydroids.

One of the zooids of certain Siphonophora, having somewhat the form, and the essential structure, of the bell of a jellyfish, and acting as a swimming organ.

es. Nutritive plasma. (Biol.) See Idioplasma. -- Nutritive polyp (Zoöl.), any one of the zooids of a compound hydroid, or coral, which has a mouth and digestive cavity. -- Nu"tri*tive*ly, adv. -- Nu"tri*tive*ness, n.

The colorless porous framework, or stroma, of red blood corpuscles from which the zooid, or hemoglobin and other substances of the corpuscles, may be dissolved out.

One of the special zooids, or cells, of Bryozoa, destined to receive and develop ova; an ovicell. See Bryozoa.

la, Pteroides, and allied genera of Alcyonaria, having a featherlike form; a sea-pen. The zooids are situated along one edge of the side branches.

A shoot or bud of a plant; a polyp or zooid of the compound Hydrozoa Anthozoa, etc.; also, an individual, in the narrowest sense, among the higher animals. Haeckel. True corms, composed of united personæ . . . usually arise by gemmation, . . . yet in sponges and corals occasionally by fusion of several originally disti…

One of the feeding or nutritive zooids of a hydroid or coral.

One of the ordinary zooids of the Bryozoa. [Spellt also polypid.]