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An extinct genus of huge vertebrates, probably dinosaurs, known only from four-toed tracks in Triassic sandstones.

tence, continuance, or supply; to the end; completely; hence, in, or into, a condition of extinction, exhaustion, completion; as, the fuel, or the fire, has burned out. "Hear me out." Dryden. Deceitiful men shall not live out half their days. Ps. iv. 23. When the butt is out, we will drink water. Shak.…

A large extinct ostrichlike bird of New Zealand.

An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palæechini. [Written also Palæechinoidea.]

the earlier half of the "Stone Age;" the remains belonging to it are for the most part of extinct animals, with relics of human beings.

An extinct genus of herbivorous Tertiary mammals, once supposed to have resembled the tapir in form, but now known to have had a more slender form, with a long neck like that of a llama. [Written also Palæotherium.]

The science of extinct animals, a branch of paleontology.

A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian. Pentamerus limestone (Geol.), a Silurian limestone composed largely of the shells of Pentamerus.

To make perpetual; to cause to endure, or to be continued, indefinitely; to preserve from extinction or oblivion; to eternize. Addison. Burke.

The act of making perpetual, or of preserving from extinction through an endless existence, or for an indefinite period of time; continuance. Sir T. Browne.

A group of extinct carnivorous whales. Their teeth had compressed and serrated crowns. It includes Squalodon and allied genera.

An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus.

anterior and concave at the posterior end; -- said of the centra of the vertebræ of some extinct dinouaurs.

An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia.

A genus of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age.

An extinct genus of horses from the Pliocene deposits. Each foot had a single toe (or hoof), as in the common horse.

An extinct genus of marine reptiles allied to Plesiosaurus, but having a much shorter neck.

An extinct genus of brachiopods, very characteristic of the Carboniferous rocks.

An extinct genus of reptiles of the Permian period. Called also Protosaurus.

An extinct flying reptile; one of the Pterosauria. See Illustration in Appendix.