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One of the Dinosauria. [Written also deinosaur, and deinosaurian.]

rs were five-toed and quadrupedal. See Illust. of Compsognathus, also Illustration of Dinosaur in Appendix.

An extinct, long-necked, marine, cretaceous reptile from Kansas, allied to Plesiosaurus.

One of the Enaliosauria.

An extinct group of marine reptiles, embracing both the Ichthyosauria and the Plesiosauria, now regarded as distinct orders.

Pertaining to the Enaliosauria. -- n.

An extinct marine reptile from the coal measures of Nova Scotia; -- so named because supposed to be of the earliest known reptiles.

An American herbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation.

The Enaliosauria.

A large Wealden dinosaur from the Tilgate Forest, England. It was about twenty feet long, protected by bony plates in the skin, and armed with spines.

Same as Hylæosaur.

One of the Ichthyosaura.

An extinct order of marine reptiles, including Ichthyosaurus and allied forms; -- called also Ichthyopterygia. They have not been found later than the Cretaceous period.

Of or pertaining to the Ichthyosauria. -- n.

An extinct genus of marine reptiles; -- so named from their short, biconcave vertebræ, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oölitic, and Cretaceous formations.

A division of reptiles, including the serpents and lizards; the Plagiotremata.

A large extinct genus of labyrinthodonts, found in the European Triassic rocks.

A gigantic carnivorous dinosaur, whose fossil remains have been found in England and elsewhere.

Same as Mosasauria.

An extinct genus of large herbivorous dinosaurs, found in Jurassic strata in America.