SYNOPSISThe Golgi apparatus of the epidermal club cells of the catfishSynodontis Schallcan be revealed by the classical methods and is formed of chromophobe vacuoles surrounded by chromophil walls. At certain phases the vacuoles are either missing, or they may be submicroscopic and thus beyond the limits of resolution of the light microscope.The Golgi apparatus undergoes marked morphological changes and hypertrophy according to the age and the physiological condition of the club cell.In the early stages of the growth of the club cell, hypertrophy of its Golgi apparatus takes place by the production of a large number of spherical bodies which are mostly dictyosome‐like. Further additions to the Golgi material are mainly in the form of long filaments which spread out into the cell cytoplasm and enclose at intervals spherical inner chromophobe vacuoles. There is evidence that some of the filaments may develop from the early‐formed dictyosomes by the lateral extension of the osmiophil material.With the further growth of the club cell, the Golgi vacuoles change from spherical to oval and later to more elongated forms, giving the Golgi material the conventional canalicular picture. Later the Golgi apparatus undergoes fragmentation, the fragments being found close to the cell periphery.In some of the club cells the Golgi fragments are seen in close contact with vacuoles which are interpreted as of secretory nature. These vacuoles are of common occurrence in the peripheral cytoplasm of most of the larger club cells.The secretion referred to arises in the cell cytoplasm in the immediate vicinity of the osmiophil material and not inside the Golgi chromophobe vacuo