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Elasmosaurus :: Elasmosaurus (n.) An extinct, long-necked, marine, cretaceous reptile from Kansas, allied to Plesiosaurus..

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.

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

Belemnite :: Belemnite (n.) A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, where it is ordinarily broken; but when perfect it contains a small chambered cone, called the phragmocone, prolonged, on one side, into a delicate concave blade; the thunderstone. It is the internal shell of a cephalopod related to the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages..

Inextinct :: Inextinct (a.) Not quenched; not extinct.

Ornithosauria :: Ornithosauria (n. pl.) An order of extinct flying reptiles; -- called also Pterosauria.

Stegosaurus :: Stegosauria (n. pl.) An extinct order of herbivorous dinosaurs, including the genera Stegosaurus, Omosaurus, and their allies..

Microlestes :: Microlestes (n.) An extinct genus of small Triassic mammals, the oldest yet found in European strata..

Mylodon :: Mylodon (n.) An extinct genus of large slothlike American edentates, allied to Megatherium..

Paleotherium :: Paleotherium (n.) 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..

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..

Enaliosauria :: Enaliosauria (n. pl.) An extinct group of marine reptiles, embracing both the Ichthyosauria and the Plesiosauria, now regarded as distinct orders..

Inoceramus :: Inoceramus (n.) An extinct genus of large, fossil, bivalve shells,allied to the mussels. The genus is characteristic of the Cretaceous period..

Smilodon :: Smilodon (n.) An extinct genus of saber-toothed tigers. See Mach/rodus.

Megatherium :: Megatherium (n.) An extinct gigantic quaternary mammal, allied to the ant-eaters and sloths. Its remains are found in South America..

Dinichthys :: Dinichthys (n.) A genus of large extinct Devonian ganoid fishes. In some parts of Ohio remains of the Dinichthys are abundant, indicating animals twenty feet in length..

Dinoceras :: Dinoceras (n.) A genus of large extinct Eocene mammals from Wyoming; -- called also Uintatherium. See Illustration in Appendix.

Tillodontia :: Tillodontia (n. pl.) An extinct group of Mammalia found fossil in the Eocene formation. The species are related to the carnivores, ungulates, and rodents. Called also Tillodonta..

Clidastes :: Clidastes (n.) A genus of extinct marine reptiles, allied to the Mosasaurus. See Illust. in Appendix..

Sauropoda :: Sauropoda (n. pl.) An extinct order of herbivorous dinosaurs having the feet of a saurian type, instead of birdlike, as they are in many dinosaurs. It includes the largest known land animals, belonging to Brontosaurus, Camarasaurus, and allied genera. See Illustration in Appendix..

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