Abstract
The prostomium of female Eulalia viridis is the source of a hormone which promotes vitellogenesis. Three stages in oocyte development can be recognized with respect to their response to hormone deprivation following decerebration. Oocytes less than 40 μm in diameter are refractory but will not begin vitellogenesis in the absence of the hormone. Oocytes between 40–100 μm degenerate if suddenly deprived of the hormone. Oocytes approaching full size greater than 100 μm in diameter become refractory and can survive in the absence of the hormone. The implantation of two whole prostomia into the coelom of decerebrate females counteracts the effects of decerebration and permits the successful completion of oogenesis.
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