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Sessile :: Sessile (a.) Permanently attached; -- said of the gonophores of certain hydroids which never became detached.

Campanularian :: Campanularian (n.) A hydroid of the family ampanularidae, characterized by having the polyps or zooids inclosed in bell-shaped calicles or hydrothecae..

Periderm :: Periderm (n.) The hard outer covering of hydroids and other marine animals; the perisarc.

Gonophore :: Gonophore (n.) 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..

Hydrorhiza :: Hydrorhiza (n.) The rootstock or decumbent stem by which a hydroid is attached to other objects. See Illust. under Hydroidea.

Isogonism :: Isogonism (n.) The quality of having similar sexual zooids or gonophores and dissimilar hydrants; -- said of certain hydroids.

Hydra :: Hydra (n.) Any small fresh-water hydroid of the genus Hydra, usually found attached to sticks, stones, etc., by a basal sucker..

Velum :: Velum (n.) The circular membrane that partially incloses the space beneath the umbrella of hydroid medusae.

Tubulicole :: Tubulicole (n.) Any hydroid which has tubular chitinous stems.

Acalephae :: Acalephae (n. pl.) A group of Coelenterata, including the Medusae or jellyfishes, and hydroids; -- so called from the stinging power they possess. Sometimes called sea nettles..

Hydranth :: Hydranth (n.) One of the nutritive zooids of a hydroid colony. Also applied to the proboscis or manubrium of a hydroid medusa. See Illust. of Hydroidea.

Hydrocaulus :: Hydrocaulus (n.) The hollow stem of a hydroid, either simple or branched. See Illust. of Gymnoblastea and Hydroidea..

Hydroid :: Hydroid (a.) Related to, or resembling, the hydra; of or pertaining to the Hydroidea..

Polypidom :: Polypidom (n.) A coral, or corallum; also, one of the coral-like structure made by bryozoans and hydroids..

Tubularida :: Tubularida (n. pl.) An extensive division of Hydroidea; the tubularians; -- called also Athecata, Gymnoblastea, and Tubulariae..

Tubularia :: Tubularia (n.) A genus of hydroids having large, naked, flowerlike hydranths at the summits of long, slender, usually simple, stems. The gonophores are small, and form clusters at the bases of the outer tentacles..

Stoloniferous :: Stolon (n.) An extension of the integument 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..

Zooid :: Zooid (n.) One of the individual animals in a composite group, as of Anthozoa, Hydroidea, and Bryozoa; -- sometimes restricted to those individuals in which the mouth and digestive organs are not developed..

Hydromedusa :: Hydromedusa (n.) Any medusa or jellyfish which is produced by budding from a hydroid. They are called also Craspedota, and naked-eyed medusae..

Hydroidea :: Hydroidea (n. pl.) An extensive order of Hydrozoa or Acalephae.

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