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A genus of fossil encrinoidea, from the Mesozoic rocks.

A fossil insect.

A fossil joint of a crinoid stem.

A fossil plant which is found in the lowest beds of the Silurian age.

Containing fossil remains; -- said of rocks, formations, mountains, and the like. [Obs.] Epizoötic mountains are of secondary formation. Kirwan.

a formal, finished treatise; as, an essay on the life and writings of Homer; an essay on fossils, or on commerce.

A fossil resin, so called from its strong, peculiar, pleasant odor.

A genus of Cretaceous fossil shells allied to oysters.

The fossil shells and other remains which animals have left in the strata of the earth.

The animals of any given area or epoch; as, the fauna of America; fossil fauna; recent fauna.

A genus of fossil corals abundant in the Silurian and Devonian rocks, having polygonal cells with perforated walls.

A plant, whether recent or fossil, which resembles a seaweed. See Fucoid, a.

Containing impressions of fossil fucoids or seaweeds; as, fucoidal sandstone.

A fossil coral resembling Fungia.

A genus of fossil echini, having a vaulted, helmet-shaped shell.

A cretaceous fossil sea urchin of the genus Galerites.

A group of fossil amphibians allied to the labyrinthodonts, having the head defended by bony, sculptured plates, as in some ganoid fishes.

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 vertebræ convex in front and concave behind, forming a ball and socket joint. See Ganoidel.…

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.

One of numerous species of slender and delicate fossils, of the genus Graptolites and allied genera, found in the Silurian rocks. They belong to an extinct group (Graptolithina) supposed to be hydroids.