Notes on the use of invertebrates, especially ciliates, in studies on pollution and toxicity

After treatment of the paramecia with 0.0005% cartap solution a high mortality of the paramecia in the postautogamic experimental group was observed. In the studied postautogamic experimental daily isolation line some defective paramecia were found. The abnormality was manifested by a defective separation of animals during binary fission resulting in the formation of chain forms.