Abstract
1. Oogenesis being performed in the ovary shows two different kinds of nuclei in the nursing cells. 2. The above mentioned nuclei are transferred and incorporated into the nuclei of developing eggs, which become sexually differentiated and showWolanski's methyl-green reaction. The sex determination is, therefore, cytologically progamic and genotypical. 3. The spawned eggs in the jelly strings appear first of identical shape and are all coated from the very beginning with grainy bonellian pigment, but afterwards, being reared in free water cultures in the absence of females, they differentiate into distinctly different male and female larvae. 4. The numerical ratio of the sexually differentiated larvae is discussed. 5. The true chromosomes in gamogenesis as well as in somatic cells have not been found.
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