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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..

Decline :: Decline (v. i.) A falling off; a tendency to a worse state; diminution or decay; deterioration; also, the period when a thing is tending toward extinction or a less perfect state; as, the decline of life; the decline of strength; the decline of virtue and religion..

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..

Mammoth :: Mammoth (n.) An extinct, hairy, maned elephant (Elephas primigenius), of enormous size, remains of which are found in the northern parts of both continents. The last of the race, in Europe, were coeval with prehistoric man..

Extinct :: Extinct (v. t.) To cause to be extinct.

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..

Hipparion :: Hipparion (n.) An extinct genus of Tertiary mammals allied to the horse, but three-toed, having on each foot a small lateral hoof on each side of the main central one. It is believed to be one of the ancestral genera of the Horse family..

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

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

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..

Aurochs :: Aurochs (n.) The European bison (Bison bonasus, / Europaeus), once widely distributed, but now nearly extinct, except where protected in the Lithuanian forests, and perhaps in the Caucasus. It is distinct from the Urus of Caesar, with which it has often been confused..

Taxeopoda :: Taxeopoda (n. pl.) An order of extinct Mammalia found in the Tertiary formations.

Muggletonian :: Muggletonian (n.) One of an extinct sect, named after Ludovic Muggleton, an English journeyman tailor, who (about 1657) claimed to be inspired..

Decay :: Decay (n.) Gradual failure of health, strength, soundness, prosperity, or of any species of excellence or perfection; tendency toward dissolution or extinction; corruption; rottenness; decline; deterioration; as, the decay of the body; the decay of virtue; the decay of the Roman empire; a castle in decay..

Modocs :: Modocs (n. pl.) A tribe of warlike Indians formerly inhabiting Northern California. They are nearly extinct.

Anoplotherium :: Anoplotherium (n.) A genus of extinct quadrupeds of the order Ungulata, whose were first found in the gypsum quarries near Paris; characterized by the shortness and feebleness of their canine teeth (whence the name)..

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..

Extinction :: Extinction (n.) State of being extinguished or of ceasing to be; destruction; suppression; as, the extinction of life, of a family, of a quarrel, of claim..

Brontozoum :: Brontozoum (n.) An extinct animal of large size, known from its three-toed footprints in Mesozoic sandstone..

Expiration :: Expiration (n.) A coming to a close; cessation; extinction; termination; end.

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