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Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6

Foraminifera to Fox, Edward

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Author: Various Authors
Published: 1911
Language: English
Wordcount: 173,359 / 539 pg
Flesch-Kincaid Reading Ease: 49.1
LoC Category: AE
Downloads: 1,472
Added to site: 2011.12.22
mnybks.net#: 31116
Genre: Reference
Excerpt

> Orbitolites (figs. 5, 6) we have a centre on a somewhat Milioline type; and after a few chambers in spiral succession, complete circles of chambers are formed. In the larger forms the new zones are of greater height, and horizontal bulkheads divide the

chamberlets into vertical tiers, each with its own pylomic pore.

[Illustration: FIG. 4.--Modifications of Peneroplis. 1, Dendritina; 2, Eu-Peneroplis.]

[Illustration: FIG. 5.--Shell of simple type of Orbitolites, showing primordial chamber a, and circumambient chamber b, surrounded by successive rings of chamberlets connected by circular galleries which open at the margin by pores.]

[Illustration: FIG. 6.--Animal of simple type of Orbitolites, showing primordial segment a, and circumambient segment b, surrounded by annuli of sub-segments connected by radial and circular stolon-processes.]

The Cheilostomellidae (fig. 3, 13) reproduce

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