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Tectibranchiata :: Tectibranchiata (n. pl.) An order, or suborder, of gastropod Mollusca in which the gills are usually situated on one side of the back, and protected by a fold of the mantle. When there is a shell, it is usually thin and delicate and often rudimentary. The aplysias and the bubble shells are examples..

Operculated :: Operculated (a.) Having an operculum, or an apparatus for protecting the gills; -- said of shells and of fishes..

Sigillated :: Sigillated (a.) Decorated by means of stamps; -- said of pottery.

Tracheobranchia :: Tracheobranchia (n.) One of the gill-like breathing organs of certain aquatic insect larvae. They contain tracheal tubes somewhat similar to those of other insects.

Leaflet :: Leaflet (n.) A leaflike organ or part; as, a leaflet of the gills of fishes..

Fungia :: Fungia (n.) A genus of simple, stony corals; -- so called because they are usually flat and circular, with radiating plates, like the gills of a mushroom. Some of them are eighteen inches in diameter..

Priapulacea :: Priapulacea (n. pl.) A suborder of Gephyraea, having a cylindrical body with a terminal anal opening, and usually with one or two caudal gills..

Conglomerate :: Conglomerate (n.) A rock, composed or rounded fragments of stone cemented together by another mineral substance, either calcareous, siliceous, or argillaceous; pudding stone; -- opposed to agglomerate. See Breccia..

Potamospongiae :: Potamospongiae (n. pl.) The fresh-water sponges. See Spongilla.

Lungfish :: Lungfish (n.) Any fish belonging to the Dipnoi; -- so called because they have both lungs and gills.

Unibranchiate :: Unibranchiate (a.) Having but one gill, as certain molluscs..

Stigma :: Stigma (v. t.) One of the apertures of the gill of an ascidian, and of Amphioxus..

Sigillaria :: Sigillaria (n. pl.) Little images or figures of earthenware exposed for sale, or given as presents, on the last two days of the Saturnalia; hence, the last two, or the sixth and seventh, days of the Saturnalia..

Argillous :: Argillous (a.) Argillaceous; clayey.

Orgillous :: Orgillous (a.) Proud; haughty.

Prosobranchiata :: Prosobranchiata (n. pl.) The highest division, or subclass, of gastropod mollusks, including those that have the gills situated anteriorly, or forward of the heart, and the sexes separate..

Serpula :: Serpula (n.) Any one of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family Serpulidae. They secrete a calcareous tube, which is usually irregularly contorted, but is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts..

Branchiopoda :: Branchiopoda (n. pl.) An order of Entomostraca; -- so named from the feet of branchiopods having been supposed to perform the function of gills. It includes the fresh-water genera Branchipus, Apus, and Limnadia, and the genus Artemia found in salt lakes. It is also called Phyllopoda. See Phyllopoda, Cladocera. It is sometimes used in a broader sense..

Sigillaria :: Sigillaria (n.) A genus of fossil trees principally found in the coal formation; -- so named from the seallike leaf scars in vertical rows on the surface.

Dibranchiate :: Dibranchiate (a.) Having two gills.

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