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Toxodon :: Toxodon (n.) A gigantic extinct herbivorous mammal from South America, having teeth bent like a bow. It is the type of the order Toxodonta..

Amblypoda :: Amblypoda (n. pl.) A group of large, extinct, herbivorous mammals, common in the Tertiary formation of the United States..

Mastodonsaurus :: Mastodonsaurus (n.) A large extinct genus of labyrinthodonts, found in the European Triassic rocks..

Attainder :: Attainder (n.) The act of attainting, or the state of being attainted; the extinction of the civil rights and capacities of a person, consequent upon sentence of death or outlawry; as, an act of attainder..

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.

Uintatherium :: Uintatherium (n.) An extinct genus of large Eocene ungulates allied to Dinoceras. This name is sometimes used for nearly all the known species of the group. See Dinoceras.

Eurypterus :: Eurypterus (n.) A genus of extinct Merostomata, found in Silurian rocks. Some of the species are more than three feet long..

Odontopteryx :: Odontopteryx (n.) An extinct Eocene bird having the jaws strongly serrated, or dentated, but destitute of true teeth. It was found near London..

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

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..

Ichthyornis :: Ichthyornis (n.) An extinct genus of toothed birds found in the American Cretaceous formation. It is remarkable for having biconcave vertebrae, and sharp, conical teeth set in sockets. Its wings were well developed. It is the type of the order Odontotormae..

Dromatherium :: Dromatherium (n.) A small extinct triassic mammal from North Carolina, the earliest yet found in America..

Die :: Die (v. i.) To perish in any manner; to cease; to become lost or extinct; to be extinguished.

Trigonia :: Trigonia (n.) A genus of pearly bivalve shells, numerous extinct species of which are characteristic of the Mesozoic rocks. A few living species exist on the coast of Australia..

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

Sivatherium :: Sivatherium (n.) A genus of very large extinct ruminants found in the Tertiary formation of India. The snout was prolonged in the form of a proboscis. The male had four horns, the posterior pair being large and branched. It was allied to the antelopes, but very much larger than any exsisting species..

Proterosaurus :: Proterosaurus (n.) An extinct genus of reptiles of the Permian period. Called also Protosaurus.

Mesohippus :: Mesohippus (n.) An extinct mammal of the Horse family, but not larger than a sheep, and having three toes on each foot..

Death :: Death (v. i.) Total privation or loss; extinction; cessation; as, the death of memory..

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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