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A Contribution to the Phylogeny of the Orbitoidal Foraminifera, with Descriptions of New Forms from the Eocene of Mexico

R. Wright Barker and T. F. Grimsdale
Journal of Paleontology
Vol. 10, No. 4 (Jun., 1936), pp. 231-247
Stable URL: http://www.jstor.org/stable/1298374
Page Count: 26
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Contribution to the Phylogeny of the Orbitoidal Foraminifera, with Descriptions of New Forms from the Eocene of Mexico
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Abstract

Two new genera and seven new species and varieties are described from the Eocene of Mexico. Polylepidina and Helicolepidina are shown to be descended from Amphistegina, through the new genera Helicostegina and Eulinderina, by a complete series of transitional forms. The general relationships of the group are briefly discussed, and the possible polyphyletic origin of Lepidocyclina adumbrated.

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