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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..

Enchodus :: Enchodus (n.) A genus of extinct Cretaceous fishes; -- so named from their spear-shaped teeth. They were allied to the pike (Esox).

Dinornis :: Dinornis (n.) A genus of extinct, ostrichlike birds of gigantic size, which formerly inhabited New Zealand. See Moa..

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..

Extinct :: Extinct (a.) Without a survivor; without force; dead; as, a family becomes extinct; an extinct feud or law..

Rhinoceros :: Rhinoceros (n.) Any pachyderm belonging to the genera Rhinoceros, Atelodus, and several allied genera of the family Rhinocerotidae, of which several living, and many extinct, species are known. They are large and powerful, and usually have either one or two stout conical median horns on the snout..

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

Trilobita :: Trilobita (n. pl.) An extinct order of arthropods comprising the trilobites.

Ichthyosaurus :: Ichthyosaurus (n.) An extinct genus of marine reptiles; -- so named from their short, biconcave vertebrae, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oolitic, and Cretaceous formations..

Archimedes :: Archimedes (n.) An extinct genus of Bryzoa characteristic of the subcarboniferous rocks. Its form is that of a screw.

Theriodontia :: Theriodontia (n. pl.) An extinct order of reptiles found in the Permian and Triassic formations in South Africa. In some respects they resembled carnivorous mammals. Called also Theromorpha.

Megatheroid :: Megatheroid (n.) One of a family of extinct edentates found in America. The family includes the megatherium, the megalonyx, etc..

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

Orthopoda :: Orthopoda (n. pl.) An extinct order of reptiles which stood erect on the hind legs, and resembled birds in the structure of the feet, pelvis, and other parts..

Orthis :: Orthis (n.) An extinct genus of Brachiopoda, abundant in the Paleozoic rocks..

Active :: Active (a.) In action; actually proceeding; working; in force; -- opposed to quiescent, dormant, or extinct; as, active laws; active hostilities; an active volcano..

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.

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..

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..

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

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