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

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..

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

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

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..

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

Cirri :: Cirri (pl. ) of Cirru.

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

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..

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..

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..

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

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..

Cirriped :: Cirriped (n.) One of the Cirripedia.

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

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

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

Cirrhiferous :: Cirrhiferous (a.) See Cirriferous.

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