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Crinoidea :: Crinoidea (n. pl.) A large class of Echinodermata, including numerous extinct families and genera, but comparatively few living ones. Most of the fossil species, like some that are recent, were attached by a jointed stem. See Blastoidea, Cystoidea, Comatula..

Glyptodont :: Glyptodont (n.) One of a family (Glyptodontidae) of extinct South American edentates, of which Glyptodon is the type. About twenty species are known..

Perpetuate :: Perpetuate (v. t.) To make perpetual; to cause to endure, or to be continued, indefinitely; to preserve from extinction or oblivion; to eternize..

Pliohippus :: Pliohippus (n.) An extinct genus of horses from the Pliocene deposits. Each foot had a single toe (or hoof), as in the common horse..

Clidastes :: Clidastes (n.) A genus of extinct marine reptiles, allied to the Mosasaurus. See Illust. in Appendix..

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

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

Tillodontia :: Tillodontia (n. pl.) An extinct group of Mammalia found fossil in the Eocene formation. The species are related to the carnivores, ungulates, and rodents. Called also Tillodonta..

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

Skunkhead :: Skunkhead (n.) A duck (Camptolaimus Labradorus) which formerly inhabited the Atlantic coast of New England. It is now supposed to be extinct. Called also Labrador duck, and pied duck..

Dinosauria :: Dinosauria (n. pl.) An order of extinct mesozoic reptiles, mostly of large size (whence the name). Notwithstanding their size, they present birdlike characters in the skeleton, esp. in the pelvis and hind limbs. Some walked on their three-toed hind feet, thus producing the large bird tracks, so-called, of mesozoic sandstones; others were five-toed and quadrupedal. See Illust. of Compsognathus, also Illustration of Dinosaur in Appendix..

Mosasaurian :: Mosasaurian (n.) One of an extinct order of reptiles, including Mosasaurus and allied genera. See Mosasauria..

Decline :: Decline (v. i.) To tend or draw towards a close, decay, or extinction; to tend to a less perfect state; to become diminished or impaired; to fail; to sink; to diminish; to lessen; as, the day declines; virtue declines; religion declines; business declines..

Sea Saurian :: Sea saurian (n.) Any marine saurian; esp. (Paleon.) the large extinct species of Mosasaurus, Icthyosaurus, Plesiosaurus, and related genera..

Smilodon :: Smilodon (n.) An extinct genus of saber-toothed tigers. See Mach/rodus.

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.

Garrote :: Garrote (n.) A Spanish mode of execution by strangulation, with an iron collar affixed to a post and tightened by a screw until life become extinct; also, the instrument by means of which the punishment is inflicted..

Solitaire :: Solitaire (n.) A large extinct bird (Pezophaps solitaria) which formerly inhabited the islands of Mauritius and Rodrigeuz. It was larger and taller than the wild turkey. Its wings were too small for flight. Called also solitary.

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..

Diatryma :: Diatryma (n.) An extinct eocene bird from New Mexico, larger than the ostrich..

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