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

Teleozoic :: Teleozoic (a.) Having tissued composed of cells.

Orthis :: Orthis (n.) An extinct genus of Brachiopoda, abundant in the Paleozoic rocks..

Tentaculite :: Tentaculite (n.) Any one of numerous species of small, conical fossil shells found in Paleozoic rocks. They are supposed to be pteropods..

Homoeozoic :: Homoeozoic (a.) Pertaining to, or including, similar forms or kinds of life; as, homoeozoic belts on the earth's surface..

Neozoic :: Neozoic (a.) More recent than the Paleozoic, -- that is, including the Mesozoic and Cenozoic..

Cyathophylloid :: Cyathophylloid (n.) A fossil coral of the family Cyathophyllidae; sometimes extended to fossil corals of other related families belonging to the group Rugosa; -- also called cup corals. Thay are found in paleozoic rocks.

Mesozoic :: Mesozoic (a.) Belonging, or relating, to the secondary or reptilian age, or the era between the Paleozoic and Cenozoic. See Chart of Geology..

Archaean :: Archaean (n.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life..

Paleechinoidea :: Paleechinoidea (n. pl.) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini.

Zaphrentis :: Zaphrentis (n.) An extinct genus of cyathophylloid corals common in the Paleozoic formations. It is cup-shaped with numerous septa, and with a deep pit in one side of the cup..

Rugosa :: Rugosa (n. pl.) An extinct tribe of fossil corals, including numerous species, many of them of large size. They are characteristic of the Paleozoic formations. The radiating septs, when present, are usually in multiples of four. See Cyathophylloid..

Pentamerus :: Pentamerus (n.) A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian..

Archaeozoic :: Archaeozoic (a.) Like or belonging to the earliest forms of animal life.

Paleocrinoidea :: Paleocrinoidea (n. pl.) A suborder of Crinoidea found chiefly in the Paleozoic rocks.

Permian :: Permian (a.) Belonging or relating to the period, and also to the formation, next following the Carboniferous, and regarded as closing the Carboniferous age and Paleozoic era..

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..

Bellerophon :: Bellerophon (n.) A genus of fossil univalve shells, believed to belong to the Heteropoda, peculiar to the Paleozoic age..

Paleozoic :: Paleozoic (a.) Of or pertaining to, or designating, the older division of geological time during which life is known to have existed, including the Silurian, Devonian, and Carboniferous ages, and also to the life or rocks of those ages. See Chart of Geology..

Paleozoology :: Paleozoology (n.) The Paleozoic time or strata.

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