On the presence and localization of glycogen accumulations inside coronet cells of the saccus vasculosus of the dogfish (Scylliorhinus caniculus)

Summary In several coronet cells of the saccus vasculosus of Scylliorhinus large quantities of glycogen occur, as shown by light and electron microscopy. The significance of glycogen as an energy storage necessary for a transcellular ion transport process taking place in the coronet cells is discussed.The authors thank Dr. F.C.G. van de Veerdonk, W. F. Jansen and W. F. G. Flight for reading the manuscipt and for their critical remarks. They are also indebted to Mr. H. van Kooten and his staff for their valuable photographic assistance.