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One of an extinct order of reptiles, including Mosasaurus and allied genera. See Mosasauria.

An order of large, extinct, marine reptiles, found in the Cretaceous rocks, especially in America. They were serpentlike in form and in having loosely articulated and dilatable jaws, with large recurved tteth, but they had paddlelike feet. Some of them were over fifty feet long. They are, essentially, fossil sea serpen…

A genus of extinct marine reptiles allied to the lizards, but having the body much elongated, and the limbs in the form of paddles. The first known species, nearly fifty feet in length, was discovered in Cretaceous beds near Maestricht, in the Netherlands. [Written also Mososaurus.]

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

An extinct genus of large slothlike American edentates, allied to Megatherium.

;" the human relics which belong to it are associated with the remains of animals not yet extinct. The kitchen middens of Denmark, the lake dwellings of Switzerland, and the stockaded islands, or "crannogs," of the British Isles, belong to this era. Lubbock.

iduals were found living on the southern island. It is supposed to be now nearly or quite extinct.

An extinct genus of gigantic herbivorous marsupials, found in the Pliocene formation of Australia.

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

The act of obliterating, or the state of being obliterated; extinction. Sir. M. Hale.

An extinct order of ostrichlike aquatic birds having teeth, which are set in a groove in the jaw. It includes Hesperornis, and allied genera. See Hesperornis. [Written also Odontholcae, and Odontoholcae.]

An extinct Eocene bird having the jaws strongly serrated, or dentated, but destitute of true teeth. It was found near London.

An order of extinct toothed birds having the teeth in sockets, as in the genus Ichthyornis. See Ichthyornis.

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.

An extinct order of birds. It includes only the Archæopteryx.

An order of extinct flying reptiles; -- called also Pterosauria.

A group of extinct Reptilia, intermediate in structure (especially with regard to the pelvis) between reptiles and birds. -- Or`ni*tho*scel"i*dan, a.

An extinct genus of Brachiopoda, abundant in the Paleozoic rocks.

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

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.