[Polymorphism of granular endoplasmic reticulum in the ovocytes of Mytilus edulis L].

In the cytoplasm of the ovocytes of Mytilus edulis, at the beginning of the yolk elaboration, but especially at the end of vitellogenesis, the polymorphous rough endoplasmic reticulum is very well developed. The concentrical disposition of the cisternae around of the mitochondria, the lipid inclusions and some granules of the yolk, are very frequent and must be considered as a system for increasing the area of proteic synthesis.