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Polythalamia :: Polythalamia (n. pl.) A division of Foraminifera including those having a manychambered shell.

Orbitolites :: Orbitolites (n.) A genus of living Foraminifera, forming broad, thin, circular disks, containing numerous small chambers..

Foraminiferous :: Foraminiferous (a.) Pertaining to, or composed of, Foraminifera; as, foraminiferous mud..

Foraminifer :: Foraminifer (n.) One of the foraminifera.

Reticularia :: Reticularia (n. pl.) An extensive division of rhizopods in which the pseudopodia are more or less slender and coalesce at certain points, forming irregular meshes. It includes the shelled Foraminifera, together with some groups which lack a true shell..

Polythalamous :: Polythalamous (a.) Many-chambered; -- applied to shells of Foraminifera and cephalopods. See Illust. of Nautilus.

Foraminifera :: Foraminifera (n. pl.) An extensive order of rhizopods which generally have a chambered calcareous shell formed by several united zooids. Many of them have perforated walls, whence the name. Some species are covered with sand. See Rhizophoda..

Globigerina :: Globigerina (n.) A genus of small Foraminifera, which live abundantly at or near the surface of the sea. Their dead shells, falling to the bottom, make up a large part of the soft mud, generally found in depths below 3,000 feet, and called globigerina ooze. See Illust. of Foraminifera..

Porcellaneous :: Porcellaneous (a.) Having a smooth, compact shell without pores; -- said of certain Foraminifera..

Monothalama :: Monothalama (n. pl.) A division of Foraminifera including those that have only one chamber.

Eozoon :: Eozoon (n.) A peculiar structure found in the Archaean limestones of Canada and other regions. By some geologists it is believed to be a species of gigantic Foraminifera, but others consider it a concretion, without organic structure..

Orbulina :: Orbulina (n.) A genus of minute living Foraminifera having a globular shell.

Perforata :: Perforata (n. pl.) A division of Foraminifera, including those having perforated shells..

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..

Rhizopoda :: Rhizopoda (n. pl.) An extensive class of Protozoa, including those which have pseudopodia, by means of which they move about and take their food. The principal groups are Lobosa (or Am/bea), Helizoa, Radiolaria, and Foraminifera (or Reticularia). See Protozoa..

Miliola :: Miliola (n.) A genus of Foraminifera, having a porcelanous shell with several longitudinal chambers..

Imperforata :: Imperforata (n. pl.) A division of Foraminifera, including those in which the shell is not porous..

Lagenian :: Lagenian (a.) Like, or pertaining to, Lagena, a genus of Foraminifera having a straight, chambered shell..

Nummulites :: Nummulites (n.) A genus of extinct Tertiary Foraminifera, having a thin, flat, round shell, containing a large number of small chambers arranged spirally..

Thalamophora :: Thalamophora (n. pl.) Same as Foraminifera.

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