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Littorina :: Littorina (n.) A genus of small pectinibranch mollusks, having thick spiral shells, abundant between tides on nearly all rocky seacoasts. They feed on seaweeds. The common periwinkle is a well-known example. See Periwinkle..

Acrospire :: Acrospire (n.) The sprout at the end of a seed when it begins to germinate; the plumule in germination; -- so called from its spiral form.

Stripe :: Strip (n.) The issuing of a projectile from a rifled gun without acquiring the spiral motion.

Right-handed :: Right-handed (a.) Having the whorls rising from left to right; dextral; -- said of spiral shells. See Illust. of Scalaria.

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..

Volute :: Volute (n.) A spiral turn, as in certain shells..

Bulimus :: Bulimus (n.) A genus of land snails having an elongated spiral shell, often of large size. The species are numerous and abundant in tropical America..

Volution :: Volution (n.) A whorl of a spiral shell.

Spiral :: Spiral (a.) A plane curve, not reentrant, described by a point, called the generatrix, moving along a straight line according to a mathematical law, while the line is revolving about a fixed point called the pole. Cf. Helix..

Pillworm :: Pillworm (n.) Any myriapod of the genus Iulus and allied genera which rolls up spirally; a galleyworm. See Illust. under Myriapod.

Tracheid :: Tracheid (n.) A wood cell with spiral or other markings and closed throughout, as in pine wood..

Markhoor :: Markhoor (n.) A large wild goat (Capra megaceros), having huge flattened spiral horns. It inhabits the mountains of Northern India and Cashmere..

Fauces :: Fauces (n.pl.) That portion of the interior of a spiral shell which can be seen by looking into the aperture.

Sasin :: Sasin (n.) The Indian antelope (Antilope bezoartica, / cervicapra), noted for its beauty and swiftness. It has long, spiral, divergent horns..

Turbinal :: Turbinal (a.) Rolled in a spiral; scroll-like; turbinate; -- applied to the thin, plicated, bony or cartilaginous plates which support the olfactory and mucous membranes of the nasal chambers..

Spirant :: Spiralozooid (n.) One of the special defensive zooids of certain hydroids. They have the form of long, slender tentacles, and bear lasso cells..

Twist :: Twist (v. i.) To follow a helical or spiral course; to be in the form of a helix.

Involuted :: Involuted (a.) Rolled inward spirally.

Parastichy :: Parastichy (n.) A secondary spiral in phyllotaxy, as one of the evident spirals in a pine cone..

Solarium :: Solarium (n.) Any one of several species of handsome marine spiral shells of the genus Solarium and allied genera. The shell is conical, and usually has a large, deep umbilicus exposing the upper whorls. Called also perspective shell..

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