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

Cirri :: Cirri (pl. ) of Cirru.

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

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..

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

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

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

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..

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

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

Barnacle :: Barnacle (n.) Any cirriped crustacean adhering to rocks, floating timber, ships, etc., esp. (a) the sessile species (genus Balanus and allies), and (b) the stalked or goose barnacles (genus Lepas and allies). See Cirripedia, and Goose barnacle..

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

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

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

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

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

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..

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..

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

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