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Pleurotoma :: Pleurotoma (n.) Any marine gastropod belonging to Pleurotoma, and ether allied genera of the family Pleurotmidae. The species are very numerous, especially in tropical seas. The outer lip has usually a posterior notch or slit..

Posterior :: Posterior (a.) At or toward the caudal extremity; caudal; -- in human anatomy often used for dorsal.

Pygostyle :: Pygostyle (n.) The plate of bone which forms the posterior end of the vertebral column in most birds; the plowshare bone; the vomer. It is formed by the union of a number of the last caudal vertebrae, and supports the uropigium..

Whipworm :: Whipworm (n.) A nematode worm (Trichocephalus dispar) often found parasitic in the human intestine. Its body is thickened posteriorly, but is very long and threadlike anteriorly..

Superior :: Superior (a.) Belonging to the part of an axillary flower which is toward the main stem; posterior.

Postcommissure :: Postcommissure (n.) A transverse commisure in the posterior part of the roof of the third ventricle of the brain; the posterior cerebral commisure.

Uropod :: Uropod (n.) Any one of the abdominal appendages of a crustacean, especially one of the posterior ones, which are often larger than the rest, and different in structure, and are used chiefly in locomotion. See Illust. of Crustacea, and Stomapoda..

Abdomen :: Abdomen (n.) The posterior section of the body, behind the thorax, in insects, crustaceans, and other Arthropoda..

Urohyal :: Urohyal (a.) Of or pertaining to one or more median and posterior elements in the hyoidean arch of fishes.

Zygapophysis :: Zygapophysis (n.) One of the articular processes of a vertebra, of which there are usually four, two anterior and two posterior. See under Vertebra..

Obcompressed :: Obcompressed (a.) Compressed or flattened antero-posteriorly, or in a way opposite to the usual one..

Turnus :: Turnus (n.) A common, large, handsome, American swallowtail butterfly, now regarded as one of the forms of Papilio, / Jasoniades, glaucus. The wings are yellow, margined and barred with black, and with an orange-red spot near the posterior angle of the hind wings. Called also tiger swallowtail. See Illust. under Swallowtail..

Hindbrain :: Hindbrain (n.) The posterior of the three principal divisions of the brain, including the epencephalon and metencephalon. Sometimes restricted to the epencephalon only..

Posteriorly :: Posteriorly (adv.) Subsequently in time; also, behind in position..

Platycoelian :: Platycoelian (a.) Flat at the anterior and concave at the posterior end; -- said of the centra of the vertebrae of some extinct dinouaurs.

Amphipoda :: Amphipoda (n. pl.) A numerous group of fourteen -- footed Crustacea, inhabiting both fresh and salt water. The body is usually compressed laterally, and the anterior pairs or legs are directed downward and forward, but the posterior legs are usually turned upward and backward. The beach flea is an example. See Tetradecapoda and Arthrostraca..

Pygal :: Pygal (a.) Situated in the region of the rump, or posterior end of the backbone; -- applied especially to the posterior median plates in the carapace of chelonians..

Strepsipterous :: Strepsiptera (n. pl.) A group of small insects having the anterior wings rudimentary, and in the form of short and slender twisted appendages, while the posterior ones are large and membranous. They are parasitic in the larval state on bees, wasps, and the like; -- called also Rhipiptera. See Illust. under Rhipipter..

Metapode :: Metapode (n.) The posterior division of the foot in the Gastropoda and Pteropoda.

Telotrochous :: Telotrochous (a.) Having both a preoral and a posterior band of cilla; -- applied to the larvae of certain annelids.

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