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Zaphrentis :: Zaphrentis (n.) An extinct genus of cyathophylloid corals common in the Paleozoic formations. It is cup-shaped with numerous septa, and with a deep pit in one side of the cup..

Absumption :: Absumption (n.) Act of wasting away; a consuming; extinction.

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

Teleosaurus :: Teleosaurus (n.) A genus of extinct crocodilian reptiles of the Jurassic period, having a long and slender snout..

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

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

Epiornis :: Epiornis (n.) One of the gigantic ostrichlike birds of the genus Aepiornis, only recently extinct. Its remains have been found in Madagascar..

Diprotodon :: Diprotodon (n.) An extinct Quaternary marsupial from Australia, about as large as the hippopotamus; -- so named because of its two large front teeth. See Illustration in Appendix..

Sea Elephant :: Sea elephant () A very large seal (Macrorhinus proboscideus) of the Antarctic seas, much hunted for its oil. It sometimes attains a length of thirty feet, and is remarkable for the prolongation of the nose of the adult male into an erectile elastic proboscis, about a foot in length. Another species of smaller size (M. angustirostris) occurs on the coast of Lower California, but is now nearly extinct..

Megaphyton :: Megaphyton (n.) An extinct genus of tree ferns with large, two-ranked leaves, or fronds..

Expire :: Expire (v. i.) To come to an end; to cease; to terminate; to perish; to become extinct; as, the flame expired; his lease expires to-day; the month expired on Saturday..

Rukh :: Rukh (n.) A large bird, supposed by some to be the same as the extinct Epiornis of Madagascar..

Pterosauria :: Pterosauria (n. pl.) An extinct order of flying reptiles of the Mesozoic age; the pterodactyls; -- called also Pterodactyli, and Ornithosauria..

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

Mosasaurus :: Mosasaurus (n.) A genus of extinct marine reptiles allied to the lizards, but having the body much elongated, and the limbs in the form of paddles. The first known species, nearly fifty feet in length, was discovered in Cretaceous beds near Maestricht, in the Netherlands..

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..

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

Xiphodon :: Xiphodon (n.) An extinct genus of artiodactylous mammals found in the European Tertiary formations. It had slender legs, didactylous feet, and small canine teeth..

Trilobite :: Trilobite (n.) Any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment..

Cheirotherium :: Cheirotherium (n.) A genus of extinct animals, so named from fossil footprints rudely resembling impressions of the human hand, and believed to have been made by labyrinthodont reptiles. See Illustration in Appendix..

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