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Tessellata :: Tessellata (n. pl.) A division of Crinoidea including numerous fossil species in which the body is covered with tessellated plates.

Archaeopteryx :: Archaeopteryx (n.) A fossil bird, of the Jurassic period, remarkable for having a long tapering tail of many vertebrae with feathers along each side, and jaws armed with teeth, with other reptilian characteristics..

Ganocephala :: Ganocephala (n. pl.) A group of fossil amphibians allied to the labyrinthodonts, having the head defended by bony, sculptured plates, as in some ganoid fishes..

Heliolite :: Heliolite (n.) A fossil coral of the genus Heliolites, having twelve-rayed cells. It is found in the Silurian rocks..

Essay :: Essay (n.) A composition treating of any particular subject; -- usually shorter and less methodical than a formal, finished treatise; as, an essay on the life and writings of Homer; an essay on fossils, or on commerce..

Fossilize :: Fossilize (v. t.) To cause to become antiquated, rigid, or fixed, as by fossilization; to mummify; to deaden..

Calamite :: Calamite (n.) A fossil plant of the coal formation, having the general form of plants of the modern Equiseta (the Horsetail or Scouring Rush family) but sometimes attaining the height of trees, and having the stem more or less woody within. See Acrogen, and Asterophyllite..

Ichthyolite :: Ichthyolite (n.) A fossil fish, or fragment of a fish..

Pycnodont :: Pycnodont (n.) Any fossil fish belonging to the Pycnodontini. They have numerous round, flat teeth, adapted for crushing..

Ginglymodi :: Ginglymodi (n.) An order of ganoid fishes, including the modern gar pikes and many allied fossil forms. They have rhombic, ganoid scales, a heterocercal tail, paired fins without an axis, fulcra on the fins, and a bony skeleton, with the vertebrae convex in front and concave behind, forming a ball and socket joint. See Ganoidel..

Euosmitte :: Euosmitte (n.) A fossil resin, so called from its strong, peculiar, pleasant odor..

Notornis :: Notornis (n.) A genus of birds allied to the gallinules, but having rudimentary wings and incapable of flight. Notornis Mantelli was first known as a fossil bird of New Zealand, but subsequently a few individuals were found living on the southern island. It is supposed to be now nearly or quite extinct..

Nautilite :: Nautilite (n.) A fossil nautilus.

Parkeria :: Parkeria (n.) A genus of large arenaceous fossil Foraminifera found in the Cretaceous rocks. The species are globular, or nearly so, and are of all sizes up to that of a tennis ball..

Cystidea :: Cystidea (n. pl.) An order of Crinoidea, mostly fossils of the Paleozoic rocks. They were usually roundish or egg-shaped, and often unsymmetrical; some were sessile, others had short stems..

Teleosaur :: Teleosaur (n.) Any one of several species of fossil suarians belonging to Teleosaurus and allied genera. These reptiles are related to the crocodiles, but have biconcave vertebrae..

Spirillum :: Spirifer (n.) Any one of numerous species of fossil brachipods of the genus Spirifer, or Delthyris, and allied genera, in which the long calcareous supports of the arms form a large spiral, or helix, on each side..

Lithocarp :: Lithocarp (n.) Fossil fruit; a fruit petrified; a carpolite.

Rhynchonella :: Rhynchonella (n.) A genus of brachiopods of which some species are still living, while many are found fossil..

Trochite :: Trochite (n.) A wheel-like joint of the stem of a fossil crinoid.

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