Abstract
1. The production of male-producing females can be partly or wholly repressed by external conditions in parthenogenetic races of Hydatina senta.2. The parthenogenetic strains are shown to be distinct because under identical external conditions they differ in their power to produce male-producing females. This may indicate that they differ in their potentiality of producing male-producing females or that they differ in degree of responsiveness to the influences which cause male-producing females to be produced. The latter alternative seems more probable.3. The two sister parthenogenetic strains developing from one fertilized egg differed in their longevity. One lived about a year longer and produced over one hundred more generations than the other.
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