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

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

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.

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

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

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

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

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

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

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

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..

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..

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..

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

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..

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..

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..

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

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

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