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Pycnodontini :: Pycnodontini (n. pl.) An extinct order of ganoid fishes. They had a compressed body, covered with dermal ribs (pleurolepida) and with enameled rhomboidal scales..

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..

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

Extinction :: Extinction (n.) The act of extinguishing or making extinct; a putting an end to; the act of putting out or destroying light, fire, life, activity, influence, etc..

Otozoum :: Otozoum (n.) An extinct genus of huge vertebrates, probably dinosaurs, known only from four-toed tracks in Triassic sandstones..

Titanotherium :: Titanotherium (n.) A large American Miocene mammal, allied to the rhinoceros, and more nearly to the extinct Brontotherium..

Out :: Out (a.) Beyond the limit of existence, continuance, or supply; to the end; completely; hence, in, or into, a condition of extinction, exhaustion, completion; as, the fuel, or the fire, has burned out..

Moho :: Moho (n.) A gallinule (Notornis Mantelli) formerly inhabiting New Zealand, but now supposed to be extinct. It was incapable of flight. See Notornis..

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

Cestraciont :: Cestraciont (n.) A shark of the genus Cestracion, and of related genera. The posterior teeth form a pavement of bony plates for crushing shellfish. Most of the species are extinct. The Port Jackson shark and a similar one found in California are living examples..

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..

Nummulites :: Nummulites (n.) A genus of extinct Tertiary Foraminifera, having a thin, flat, round shell, containing a large number of small chambers arranged spirally..

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

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

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

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

Paleechinoidea :: Paleechinoidea (n. pl.) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini.

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

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..

Rugosa :: Rugosa (n. pl.) An extinct tribe of fossil corals, including numerous species, many of them of large size. They are characteristic of the Paleozoic formations. The radiating septs, when present, are usually in multiples of four. See Cyathophylloid..

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