Description of two new species of Euplotes and Euplotes rariseta from Antarctica - VALBONESI, Alessandro; P. LUPORINI (Springer Verlag Germany:Tiergartenstrasse 17, D 69121 Heidelberg Germany:011 49 6221 3450, EMAIL: g.braun@springer.de, INTERNET: http://www.springer.de, Fax: 011 49 6221 345229, 1990)