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Cirripedia :: Cirripedia (n. pl.) An order of Crustacea including the barnacles. When adult, they have a calcareous shell composed of several pieces. From the opening of the shell the animal throws out a group of curved legs, looking like a delicate curl, whence the name of the group. See Anatifa..

Cirrostomi :: Cirrostomi (n. pl.) The lowest group of vertebrates; -- so called from the cirri around the mouth; the Leptocardia. See Amphioxus.

Cirrhiferous :: Cirrhiferous (a.) See Cirriferous.

Cirrobranchiata :: Cirrobranchiata (n. pl.) A division of Mollusca having slender, cirriform appendages near the mouth; the Scaphopoda..

Cirrigrade :: Cirrigrade (a.) Moving or moved by cirri, or hairlike appendages..

Tergum :: Tergum (n.) One of the dorsal plates of the operculum of a cirriped.

Cirri :: Cirri (pl. ) of Cirru.

Cirriferous :: Cirriferous (a.) Bearing cirri, as many plants and animals..

Cirrus :: Cirrus (n.) The jointed, leglike organs of Cirripedia. See Annelida, and Polychaeta..

Acorn-shell :: Acorn-shell (n.) One of the sessile cirripeds; a barnacle of the genus Balanus. See Barnacle.

Pedunculata :: Pedunculata (n. pl.) A division of Cirripedia, including the stalked or goose barnacles..

Spirable :: Spiodea (n. pl.) An extensive division of marine Annelida, including those that are without oral tentacles or cirri, and have the gills, when present, mostly arranged along the sides of the body. They generally live in burrows or tubes..

Comatula :: Comatula (n.) A crinoid of the genus Antedon and related genera. When young they are fixed by a stem. When adult they become detached and cling to seaweeds, etc., by their dorsal cirri; -- called also feather stars..

Articulus :: Articulus (n.) A joint of the cirri of the Crinoidea; a joint or segment of an arthropod appendage.

Cirriform :: Cirriform (a.) Formed like a cirrus or tendril; -- said of appendages of both animals and plants.

Abdominalia :: Abdominalia (n. pl.) A group of cirripeds having abdominal appendages.

Anatifa :: Anatifa (n.) An animal of the barnacle tribe, of the genus Lepas, having a fleshy stem or peduncle; a goose barnacle. See Cirripedia..

Tubicolae :: Tubicolae (n. pl.) A division of annelids including those which construct, and habitually live in, tubes. The head or anterior segments usually bear gills and cirri. Called also Sedentaria, and Capitibranchiata. See Serpula, and Sabella..

Apoda :: Apoda (n.) A group of cirripeds, destitute of footlike organs..

Oral :: Oral (a.) Of or pertaining to the mouth; surrounding or lining the mouth; as, oral cilia or cirri..

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