The pair of pygidial glands of Enhydrus sulcatus opens in the pleural region of the abdominal segment. The gland possesses an excretorial canal, which, in its apical part, continuates into a voluminous and folded reservatory, provided with a muscular network to squeeze out the secretion fluid. Between these two parts there is a valve, characterized by a special cuticular structure. In the beginning part of the reservatory there lies an extensive glandular area. In front of the valve, branches a glandular tube from the wall of the excretorial canal, compounded of a central canal and lateral diverticles. The cells of the glandular area secrete an aquous fluid, which possesses only a little quantity of organical components and which serves as a vehiculum for the oily product of the glandular tube. The gland cells possess an intracellular excretorial apparatus, called "Binnenblase" by other authors, and which we considerate like a true rhabdorium. The cuticular tube, which penetrates into the rhabdorial complex and which forms the initial part of the excretorial canal, represents the real apical pole of the gland cell.