THE ECOLOGICAL RELATIONSHIPS OF CERTAIN FRESHWATER COPEPODS.

The author reflects on the study of ecological relationships of freshwater copepods based on the article written by A.G. Lowndes on Entomostraca. He explains the interrelationship of Eurytemora ladnulata and Diaptomus gracilis; and the seasonal occurrence of Cyclops strenuus, Calanoid fuscus and Calanoid albidus. The author argues that it is doubtful to state that the absence of Diaptomus gracilis is caused by slow rate of spread.