Abstract
THE association between Zoochlorellae and some freshwater sponges of the family Spongillidae is well known for its constancy and has been well studied1. In the case of similar associations of Zoochlorellae with the fresh-water hydroid Clorohydra viridissima2 and of Zooxanthellae with the sea-anemone Anthopleura elegantissima3, the occurrence of a direct transfer of material from the autotrophic symbiont to the tissues of the Coelenterates has been demonstrated.
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