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Ammonite :: Ammonite (n.) A fossil cephalopod shell related to the nautilus. There are many genera and species, and all are extinct, the typical forms having existed only in the Mesozoic age, when they were exceedingly numerous. They differ from the nautili in having the margins of the septa very much lobed or plaited, and the siphuncle dorsal. Also called serpent stone, snake stone, and cornu Ammonis..

Threadfish :: Threadfish (n.) A carangoid fish (Caranx gallus, or C. crinitus) having the anterior rays of the soft dorsal and anal fins prolonged in the form of long threads..

Dosel :: Dosel (n.) Same as Dorsal, n..

Mesoarium :: Mesoarium (n.) The fold of peritoneum which suspends the ovary from the dorsal wall of the body cavity.

Thoracostraca :: Thoracostraca (a.) An extensive division of Crustacea, having a dorsal shield or carapec/ //niting all, or nearly all, of the thoracic somites to the head. It includes the crabs, lobsters, shrimps, and similar species..

Dorse :: Dorse (n.) Same as dorsal, n..

Mesohepar :: Mesohepar (n.) A fold of the peritoneum connecting the liver with the dorsal wall of the abdominal cavity.

Epididymis :: Epididymis (n.) An oblong vermiform mass on the dorsal side of the testicle, composed of numerous convolutions of the excretory duct of that organ..

Lumpfish :: Lumpfish (n.) A large, thick, clumsy, marine fish (Cyclopterus lumpus) of Europe and America. The color is usually translucent sea green, sometimes purplish. It has a dorsal row of spiny tubercles, and three rows on each side, but has no scales. The ventral fins unite and form a ventral sucker for adhesion to stones and seaweeds. Called also lumpsucker, cock-paddle, sea owl..

Pronotum :: Pronotum (n.) The dorsal plate of the prothorax in insects. See Illust. of Coleoptera.

Chiton :: Chiton (n.) One of a group of gastropod mollusks, with a shell composed of eight movable dorsal plates. See Polyplacophora..

Sunfish :: Sunfish (n.) Any one of numerous species of perch-like North American fresh-water fishes of the family Centrachidae. They have a broad, compressed body, and strong dorsal spines. Among the common species of the Eastern United States are Lepomis gibbosus (called also bream, pondfish, pumpkin seed, and sunny), the blue sunfish, or dollardee (L. pallidus), and the long-eared sunfish (L. auritus). Several of the species are called also pondfish..

Dorsal :: Dorsal (a.) Pertaining to the surface naturally superior, as of a creeping hepatic moss..

Ventral :: Ventral (a.) Of, pertaining to, or situated near, the belly, or ventral side, of an animal or of one of its parts; hemal; abdominal; as, the ventral fin of a fish; the ventral root of a spinal nerve; -- opposed to dorsal..

Decubitus :: Decubitus (n.) An attitude assumed in lying down; as, the dorsal decubitus..

Tethys :: Tethys (n.) A genus of a large naked mollusks having a very large, broad, fringed cephalic disk, and branched dorsal gills. Some of the species become a foot long and are brilliantly colored..

Prescutum :: Prescutum (n.) The first of the four pieces composing the dorsal part, or tergum, of a thoracic segment of an insect. It is usually small and inconspicuous..

Pharyngobranchial :: Pharyngobranchial (a.) Of or pertaining to the pharynx and the branchiae; -- applied especially to the dorsal elements in the branchial arches of fishes. See Pharyngeal.

Synepy :: Synentognathi (n. pl.) An order of fishes, resembling the Physoclisti, without spines in the dorsal, anal, and ventral fins. It includes the true flying fishes..

Springe :: Springbuck (n.) A South African gazelle (Gazella euchore) noted for its graceful form and swiftness, and for its peculiar habit of springing lighty and suddenly into the air. It has a white dorsal stripe, expanding into a broad patch of white on the rump and tail. Called also springer..

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