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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..

Hesperornis :: Hesperornis (n.) A genus of large, extinct, wingless birds from the Cretaceous deposits of Kansas, belonging to the Odontornithes. They had teeth, and were essentially carnivorous swimming ostriches. Several species are known. See Illust. in Append..

Phocodontia :: Phocodontia (n. pl.) A group of extinct carnivorous whales. Their teeth had compressed and serrated crowns. It includes Squalodon and allied genera.

Perpetuation :: Perpetuation (n.) The act of making perpetual, or of preserving from extinction through an endless existence, or for an indefinite period of time; continuance..

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

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

Bethlemite :: Bethlemite (n.) One of an extinct English order of monks.

Placodermi :: Placodermi (n. pl.) 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..

Extinct :: Extinct (a.) Extinguished; put out; quenched; as, a fire, a light, or a lamp, is extinct; an extinct volcano..

Graptolite :: Graptolite (n.) One of numerous species of slender and delicate fossils, of the genus Graptolites and allied genera, found in the Silurian rocks. They belong to an extinct group (Graptolithina) supposed to be hydroids..

Hybodus :: Hybodus (n.) An extinct genus of sharks having conical, compressed teeth..

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

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..

Merostomata :: Merostomata (n. pl.) A class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs of the last group. See Limulus..

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

Mastodon :: Mastodon (n.) An extinct genus of mammals closely allied to the elephant, but having less complex molar teeth, and often a pair of lower, as well as upper, tusks, which are incisor teeth. The species were mostly larger than elephants, and their romains occur in nearly all parts of the world in deposits ranging from Miocene to late Quaternary time..

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..

Platycoelian :: Platycoelian (a.) Flat at the anterior and concave at the posterior end; -- said of the centra of the vertebrae of some extinct dinouaurs.

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..

Pterodactyl :: Pterodactyl (n.) An extinct flying reptile; one of the Pterosauria. See Illustration in Appendix.

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