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Rate | Answer | Clue |
TRILOBITE | Extinct marine arthropod, a common fossil | |
MOSASAURIA | An order of large, extinct, marine reptiles, found in the Cretaceous rocks, especially in America. They were serpentlike in form and in having ... | |
ELASMOSAURUS | An extinct, long-necked, marine, cretaceous reptile from Kansas, allied to Plesiosaurus. | |
CLIDASTES | A genus of extinct marine reptiles, allied to the Mosasaurus. See Illust. in Appendix. | |
PLIOSAURUS | An extinct genus of marine reptiles allied to Plesiosaurus, but having a much shorter neck. | |
SEA SAURIAN | Any marine saurian; esp. (Paleon.) the large extinct species of Mosasaurus, Icthyosaurus, Plesiosaurus, and related genera. | |
STEGOCEPHALA | An extinct order of amphibians found fossil in the Mesozoic rocks; called also Stegocephali, and Labyrinthodonta. | |
SCOLITHUS | A tubular structure found in Potsdam sandstone, and believed to be the fossil burrow of a marine worm. | |
BACULITE | A cephalopod of the extinct genus Baculites, found fossil in the Cretaceous rocks. It is like an uncoiled ammonite. | |
ENALIOSAURIA | An extinct group of marine reptiles, embracing both the Ichthyosauria and the Plesiosauria, now regarded as distinct orders. | |
PLESIOSAURIA | An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia. | |
INOCERAMUS | An extinct genus of large, fossil, bivalve shells,allied to the mussels. The genus is characteristic of the Cretaceous period. | |
EOSAURUS | An extinct marine reptile from the coal measures of Nova Scotia; -- so named because supposed to be of the earliest known reptiles. | |
TILLODONTIA | An extinct group of Mammalia found fossil in the Eocene formation. The species are related to the carnivores, ungulates, and rodents. Called also Tillodonta. | |
PLESIOSAURUS | A genus of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age. | |
ICHTHYOSAURIA | An extinct order of marine reptiles, including Ichthyosaurus and allied forms; -- called also Ichthyopterygia. They have not been found later than the Cretaceous period. | |
GONIATITE | One of an extinct genus of fossil cephalopods, allied to the Ammonites. The earliest forms are found in the Devonian formation, the latest, in the Triassic. | |
CHEIROTHERIUM | A genus of extinct animals, so named from fossil footprints rudely resembling impressions of the human hand, and believed to have been made by ... | |
POLYCYSTINA | A division of Radiolaria including numerous minute marine species. The skeleton is composed of silica, and is often very elegant in form and sc... | |
RUGOSA | An extinct tribe of fossil corals, including numerous species, many of them of large size. They are characteristic of the Paleozoic formations.... | |
CRINOIDEA | A large class of Echinodermata, including numerous extinct families and genera, but comparatively few living ones. Most of the fossil species, ... | |
ICHTHYOSAURUS | An extinct genus of marine reptiles; -- so named from their short, biconcave vertebrae, resembling those of fishes. Several species, varying in... | |
MOSASAURUS | 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 k... | |
NOTORNIS | ...land. It is supposed to be now nearly or quite extinct. ... | |
AMMONITE | .... There are many genera and species, and all are extinct, the typical forms having existed only in the Mesozoic age, when they were exceedingly ... |