33. New Occurrence of Rotaliatina in the Pliocene of Java

Abstract

Rotaliatina is a genus of Foraminifera errected by Dr. J. A. CUSHMAN in 1925 on material from the Upper Eocene Alazan shale of Carrizo on the Rio Tamuin, San Louis Potosi, State of Mexico. Its genotype is R. mexicana CUSHMAN. Perhaps Rotalina buliminoides REUSS described by REUSS in 1851 from the Late Tertiary (Septarien Ton) of Hermsdorf near Berlin could be regarded as congeneric with the Mexican species, being very similar to it in the trochoid spiral of test and simple suture; the original description and figures are copied below for comparison:-
“Testa elevata, pupiformi, superne dilatata, basi acuta, laevigata; spire elevata; aufractibus 3 manifestis; loculis 7 angustis, convexiusculis; facie superiore subumbilicata; aperture tenui, elongata. Altit. 0.35-0.45mm.”