The corpuscles of Stannius of Botia lohachata are made up of numerous large lobules, each of which is bounded by a septum and contains two types of cells. The secretory granules are PAS- and AF-positive, indicating that 1,2 glycol groups and non-sulphated mucoid substances are present. Detached cells in the lobule lumen are suggestive of holocrine secretion. The possibility of the existence of more than one secretory product is discussed.