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Biochemical studies in lipid composition of yolk granules from the crayfish Rhynchocinetes typus is shown to be composed mainly of cholesterol and phospholipids. Thin layer chromatography analysis demonstrates phosphatidyl-choline, -ethanolamine and -serine as its major phospholipidic components. In vivo labeling experiments using 32P-orthophosphoric acid suggest that two of the major yolk phospholipid components, phosphatidyl -choline and -serine could be synthesized in the hepatopancreas and subsequently transported via hemolymph to the growing oocyte.