Abstract
Two species of Anabaena, of the family Nostocaceae, studied in Cuba, were found to exhibit motion similar to that of the Oscillatoriaceae. The rate of movement was independent of the presence of heterocysts or of the length of the filament, and was about one half that of actively motile Oscillatoriae under the same conditions, but much more rapid than that previously recorded for the hormogonia of Phormidium. No rotation was observed in these species of Anabaena but several species of Oscillatoria and one species of Arihrospira were seen to customarily during free-swimming translation when observe under similar conditions.
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