The investigations were carried out in the village Letownia situated at an altitude of 470-625 m in the picturesque enclave on the border of the Makowski and Wyspowy Beskids. The new habitat of Paramecium biaurelia was found in the River Letowka.
Z.Komala, Department of Experimental Zoology, Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Slawkowska 17, 31-016 Krakow, Poland