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Lepidodendrid :: Lepidodendrid (n.) One of an extinct family of trees allied to the modern club mosses, and including Lepidodendron and its allies..

Urus :: Urus (n.) A very large, powerful, and savage extinct bovine animal (Bos urus / primigenius) anciently abundant in Europe. It appears to have still existed in the time of Julius Caesar. It had very large horns, and was hardly capable of domestication. Called also, ur, ure, and tur..

Ornithopappi :: Ornithopappi (n. pl.) An extinct order of birds. It includes only the Archaeopteryx.

Coccosteus :: Coccosteus (n.) An extinct genus of Devonian ganoid fishes, having the broad plates about the head studded with berrylike tubercles..

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..

Pentamerus :: Pentamerus (n.) A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian..

Dicynodont :: Dicynodont (n.) One of a group of extinct reptiles having the jaws armed with a horny beak, as in turtles, and in the genus Dicynodon, supporting also a pair of powerful tusks. Their remains are found in triassic strata of South Africa and India..

Megalonyx :: Megalonyx (n.) An extinct quaternary mammal, of great size, allied to the sloth..

Toothbill :: Toothbill (n.) A peculiar fruit-eating ground pigeon (Didunculus strigiostris) native of the Samoan Islands, and noted for its resemblance, in several characteristics, to the extinct dodo. Its beak is stout and strongly hooked, and the mandible has two or three strong teeth toward the end. Its color is chocolate red. Called also toothbilled pigeon, and manu-mea..

Plesiosauria :: Plesiosauria (n. pl.) An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia..

Fossil :: Fossil (n.) The remains of an animal or plant found in stratified rocks. Most fossils belong to extinct species, but many of the later ones belong to species still living..

Crocodilia :: Crocodilia (n. pl.) An order of reptiles including the crocodiles, gavials, alligators, and many extinct kinds..

Orthoceras :: Orthoceras (n.) An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa..

Purification :: Purification (n.) A cleansing from guilt or the pollution of sin; the extinction of sinful desires, appetites, and inclinations..

Glyptodon :: Glyptodon (n.) An extinct South American quaternary mammal, allied to the armadillos. It was as large as an ox, was covered with tessellated scales, and had fluted teeth..

Paleozooogy :: Paleozooogy (n.) The science of extinct animals, a branch of paleontology..

Annihilationist :: Annihilationist (n.) One who believes that eternal punishment consists in annihilation or extinction of being; a destructionist.

Zeuglodon :: Zeuglodon (n.) A genus of extinct Eocene whales, remains of which have been found in the Gulf States. The species had very long and slender bodies and broad serrated teeth. See Phocodontia..

Toxodonta :: Toxodonta (n.pl.) An extinct order of Mammalia found in the South American Tertiary formation. The incisor teeth were long and curved and provided with a persistent pulp. They are supposed to be related both to the rodents and ungulates. Called also Toxodontia.

Anoplotherium :: Anoplotherium (n.) A genus of extinct quadrupeds of the order Ungulata, whose were first found in the gypsum quarries near Paris; characterized by the shortness and feebleness of their canine teeth (whence the name)..

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