THE EARLY HISTORY OF THE BIDDULPHIALES. I. THE GENUSMEDLINIAGEN. NOV.

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Abstract
A brief history of the Biddulphiales is given, from the first appearance, in the early Cretaceous, of Bilingua in the late Aptian to early Albian (115–110 m.y.a.) up to the end of the Turonian (90 m.y.a.), by which time the genera Hemiaulus, Trinacria, Biddulphia, Briggera and a Eunotogramma-like species were established. A new genus, Medlinia, is described, which ranges from the late Cretaceous (early Campanian) to the Oligocene. A generic description is given and twelve species transferred to Medlinia from Sheshukovia and Triceratium; one new species, M. pseudoweissei P.A. Sims, and one new variety, M. venusta var. capitata, are described. Evolutionary trends within the Biddulphiales and within the genus Medlinia are discussed.