Vitellogenesis and Formation of the Egg Chain in Spirorbis Borealis [Serpulidae]

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Abstract
Vitellogenesis in S. borealis is described. The large protein yolk spheres consist of protein and lipoid. This comes by pinocytosis from outside the oöcyte and from the golgi within the oöcyte. This is discussed in relation to other animal oöcytes. Cortical granules are present at the periphery of the oöcyte and release their contents just before the egg leaves the coelom. When released the eggs have an envelope around them, and evidence is presented which suggests that it is formed from material produced by secretory cells around the exit hole and along the ciliated groove.