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Tricurvate :: Tricurvate (a.) Curved in three directions; as, a tricurvate spicule (see Illust. of Spicule)..

Rosette :: Rosette (n.) Any structure having a flowerlike form; especially, the group of five broad ambulacra on the upper side of the spatangoid and clypeastroid sea urchins. See Illust. of Spicule, and Sand dollar, under Sand..

Silicoidea :: Silicoidea (n. pl.) An extensive order of Porifera, which includes those that have the skeleton composed mainly of siliceous fibers or spicules..

Spiculum :: Spiculum (n.) Same as Spicule.

Spiculigenous :: Spiculigenous (a.) Producing or containing spicules.

Anchor :: Anchor (n.) One of the anchor-shaped spicules of certain sponges; also, one of the calcareous spinules of certain Holothurians, as in species of Synapta..

Trichite :: Trichite (n.) A delicate, hairlike siliceous spicule, found in certain sponges..

Spicule :: Spicule (n.) Same as Spicula.

Spongiopilin :: Spongiolite (n.) One of the microsporic siliceous spicules which occur abundantly in the texture of sponges, and are sometimes found fossil, as in flints..

Spicule :: Spicule (n.) Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria..

Halichondriae :: Halichondriae (n. pl.) An order of sponges, having simple siliceous spicules and keratose fibers; -- called also Keratosilicoidea..

Glass-sponge :: Glass-sponge (n.) A siliceous sponge, of the genus Hyalonema, and allied genera; -- so called from their glassy fibers or spicules; -- called also vitreous sponge. See Glass-rope, and Euplectella..

Calcispongiae :: Calcispongiae (n. pl.) An order of marine sponges, containing calcareous spicules. See Porifera..

Hyalospongia :: Hyalospongia (n. pl.) An order of vitreous sponges, having glassy six-rayed, siliceous spicules; -- called also Hexactinellinae..

Tetractinellida :: Tetractinellida (n. pl.) A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinae.

Radiolaria :: Radiolaria (n. pl.) Order of rhizopods, usually having a siliceous skeleton, or shell, and sometimes radiating spicules. The pseudopodia project from the body like rays. It includes the polycystines. See Polycystina..

Suberone :: Suberite (n.) Any sponge of the genus Suberites and allied genera. These sponges have a fine and compact texture, and contain minute siliceous spicules..

Sexradiate :: Sexradiate (a.) Having six rays; -- said of certain sponge spicules. See Illust. of Spicule.

Amphidisc :: Amphidisc (n.) A peculiar small siliceous spicule having a denticulated wheel at each end; -- found in freshwater sponges.

Hexactinellid :: Hexactinellid (a.) Having six-rayed spicules; belonging to the Hexactinellinae.

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