Abstract

NEW TEXAS LOWER CRETACEOUS GRYPHAEA (OSTREIDAE)

BY W. S. ADKINS

A new species of Odontogryphaea is described. It is an upper Washita marker abundant in the Grayson marl and has generally been erroneously called Gryphaea mucronata Gabb. The latter species was described from the Fredericksburg group at Arivechi, Sonora, and is a well-known Fredericksburg marker, generally and erroneously called Gryphaea marcoui Hill and Vaughan. Gryphaea Lamarck 1801 contained six valid species, and the earliest valid subsequent designation from among these appears to have been that of G. arcuata, a Liassic species, by Chenu, 1858. The present species appears to be referable to the Lower Cretaceous genus Odontogryphaea v. Ihering 1903.

SILICIFIED PLANT REMAINS FROM WESTERN NORTH AMERICA

BY CHESTER A. ARNOLD

The opportunities for paleobotanical research among the silicified plant remains of the western States have been widely neglected. Some reasons for this neglect are the scarcity of paleobotanists interested . . .

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