HOWARD A. BERN'
Fig. 5. Area of cytoplasm from a caudal neurosecretory neuron of the elasmobranch Raia batis. Note multitude of electron-dense elementary neurosecretory granules, stacks of granular endoplasniic reticulum ( E R ) , nnd Golgi centers (GC). From
Afzelius and Fridberg ( 1963).