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Eurypteroidea :: Eurypteroidea (n. pl.) An extinct order of Merostomata, of which the genus Eurypterus is the type. They are found only in Paleozoic rocks..

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..

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..

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..

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

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

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

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.

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..

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

Eozoic :: Eozoic (a.) Of or pertaining to rocks or strata older than the Paleozoic, in many of which the eozoon has been found..

Trilobite :: Trilobite (n.) Any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment..

Orthis :: Orthis (n.) An extinct genus of Brachiopoda, abundant 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..

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..

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

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

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

Blastoidea :: Blastoidea (n. pl.) One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form.

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

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