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

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..

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..

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

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

Pectostraca :: Pectostraca (n. pl.) A degenerate order of Crustacea, including the Rhizocephala and Cirripedia..

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..

Cirri :: Cirri (pl. ) of Cirru.

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..

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

Cirri :: Cirri (n. pl.) See Cirrus.

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

Cirrate :: Cirrate (a.) Having cirri along the margin of a part or organ.

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

Thoracica :: Thoracica (n. pl.) A division of cirripeds including those which have six thoracic segments, usually bearing six pairs of cirri. The common barnacles are examples..

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

Cirrus :: Cirrus (n.) A soft tactile appendage of the mantle of many Mollusca, and of the parapodia of Annelida. Those near the head of annelids are Tentacular cirri; those of the last segment are caudal cirri..

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

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

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