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

Proliferous :: Proliferous (a.) Producing sexual zooids by budding; -- said of the blastostyle of a hydroid.

Style :: Stylaster (n.) Any one of numerous species of delicate, usually pink, calcareous hydroid corals of the genus Stylaster..

Entogastric :: Entogastric (a.) Pertaining to the interior of the stomach; -- applied to a mode of budding from the interior of the gastric cavity, in certain hydroids..

Polypite :: Polypite (n.) Sometimes, the manubrium of a hydroid medusa..

Polypite :: Polypite (n.) One of the feeding zooids, or polyps, of a coral, hydroid, or siphonophore; a hydranth. See Illust. of Campanularian..

Budding :: Budding (n.) A process of asexual reproduction, in which a new organism or cell is formed by a protrusion of a portion of the animal or vegetable organism, the bud thus formed sometimes remaining attached to the parent stalk or cell, at other times becoming free; gemmation. See Hydroidea..

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..

Medusoid :: Medusoid (a.) Like a medusa; having the fundamental structure of a medusa, but without a locomotive disk; -- said of the sessile gonophores of hydroids..

Hydrotheca :: Hydrotheca (n.) One of the calicles which, in some Hydroidea (Thecaphora), protect the hydrants. See Illust. of Hydroidea, and Campanularian..

Graptolite :: Graptolite (n.) One of numerous species of slender and delicate fossils, of the genus Graptolites and allied genera, found in the Silurian rocks. They belong to an extinct group (Graptolithina) supposed to be hydroids..

Craspedota :: Craspedota (n. pl.) The hydroid or naked-eyed medusae. See Hydroidea.

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

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

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

Sertularia :: Sertularia (n.) A genus of delicate branching hydroids having small sessile hydrothecae along the sides of the branches.

Gonotheca :: Gonotheca (n.) A capsule developed on certain hydroids (Thecaphora), inclosing the blastostyle upon which the medusoid buds or gonophores are developed; -- called also gonangium, and teleophore. See Hydroidea, and Illust. of Campanularian..

Adelocodonic :: Adelocodonic (a.) Applied to sexual zooids of hydroids, that have a saclike form and do not become free; -- opposed to phanerocodonic..

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

Hydractinian :: Hydractinian (n.) Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata..

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