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Sea Fir :: Sea fir () A sertularian hydroid, especially Sertularia abietina, which branches like a miniature fir tree..

Calicle :: Calicle (n.) One of the small cuplike cavities, often with elevated borders, covering the surface of most corals. Each is formed by a polyp. (b) One of the cuplike structures inclosing the zooids of certain hydroids. See Campanularian..

Spirant :: Spiralozooid (n.) One of the special defensive zooids of certain hydroids. They have the form of long, slender tentacles, and bear lasso cells..

Sea Ginger :: Sea ginger () A hydroid coral of the genus Millepora, especially M. alcicornis, of the West Indies and Florida. So called because it stings the tongue like ginger. See Illust. under Millepore..

Polyperythrin :: Polyperythrin (n.) A coloring matter found in many simple Anthozoa and some hydroids.

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

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..

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

Theca :: Theca (n.) The chitinous cup which protects the hydranths of certain hydroids.

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..

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

Blastostyle :: Blastostyle (n.) In certain hydroids, an imperfect zooid, whose special function is to produce medusoid buds. See Hydroidea, and Athecata..

Hydrosoma :: Hydrosoma (n.) All the zooids of a hydroid colony collectively, including the nutritive and reproductive zooids, and often other kinds..

Plumularia :: Plumularia (n.) Any hydroid belonging to Plumularia and other genera of the family Plumularidae. They generally grow in plumelike forms.

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

Polyp :: Polyp (n.) One of the feeding or nutritive zooids of a hydroid or coral.

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..

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

Phylactocarp :: Phylactocarp (n.) A branch of a plumularian hydroid specially modified in structure for the protection of the gonothecae.

Gonozooid :: Gonozooid (n.) A sexual zooid, or medusoid bud of a hydroid; a gonophore. See Hydroidea, and Illust. of Campanularian..

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