PALEOGENE TRISERIAL PLANKTONIC-FORAMINIFERA

Triserial planktonic foraminiferal species from the Palaeogene are cla ssified into the Early Danian Guembelitria, with pore mounds on the te st surface, and the Early Eocene-Late Oligocene Jenkinsina, which are also microperforate but lack pore mounds. The stratigraphic and palaeo geographic ranges are discussed, the holotype of G. cretacea Cushman ( the type species of Guembelitria ia) is re-illustrated, and neotypes d esignated for G. danica (Hofker) and Jenkinsina triseriata (Terquem). Chiloguembelitria is shown to be a junior synonym of Guembelitria.