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Cease :: Cease (n.) Extinction.

Ornithopappi :: Ornithopappi (n. pl.) An extinct order of birds. It includes only the Archaeopteryx.

Paleotherium :: Paleotherium (n.) An extinct genus of herbivorous Tertiary mammals, once supposed to have resembled the tapir in form, but now known to have had a more slender form, with a long neck like that of a llama..

Escheat :: Escheat (n.) The falling back or reversion of lands, by some casualty or accident, to the lord of the fee, in consequence of the extinction of the blood of the tenant, which may happen by his dying without heirs, and formerly might happen by corruption of blood, that is, by reason of a felony or attainder..

Oreodon :: Oreodon (n.) A genus of extinct herbivorous mammals, abundant in the Tertiary formation of the Rocky Mountains. It is more or less related to the camel, hog, and deer..

Gyrodus :: Gyrodus (n.) A genus of extinct oolitic fishes, having rounded teeth in several rows adapted for crushing..

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..

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..

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..

Microlestes :: Microlestes (n.) An extinct genus of small Triassic mammals, the oldest yet found in European strata..

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.

Toothbill :: Toothbill (n.) A peculiar fruit-eating ground pigeon (Didunculus strigiostris) native of the Samoan Islands, and noted for its resemblance, in several characteristics, to the extinct dodo. Its beak is stout and strongly hooked, and the mandible has two or three strong teeth toward the end. Its color is chocolate red. Called also toothbilled pigeon, and manu-mea..

Orthoceras :: Orthoceras (n.) An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa..

Pliosaurus :: Pliosaurus (n.) An extinct genus of marine reptiles allied to Plesiosaurus, but having a much shorter neck..

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

Apteryx :: Apteryx (n.) A genus of New Zealand birds about the size of a hen, with only short rudiments of wings, armed with a claw and without a tail; the kiwi. It is allied to the gigantic extinct moas of the same country. Five species are known..

Werewolf :: Werewolf (n.) A person transformed into a wolf in form and appetite, either temporarily or permanently, whether by supernatural influences, by witchcraft, or voluntarily; a lycanthrope. Belief in werewolves, formerly general, is not now extinct..

Megalonyx :: Megalonyx (n.) An extinct quaternary mammal, of great size, allied to the sloth..

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..

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..

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