A. Transverse section through the copulatory organ at the level of the outlet of the prostate glands. B. Outlet of the bursal pieces in the ductus communis. C. Sagital reconstruction of the copulatory system. D and E. Optical sections through the epidermis of a live animal, D 'toes' of the caudal end. F and G. Eyes of live animals (F: abnormal form). H. Epithelial cells (tangential section). I. 'Haftpapille' at the caudal end. K. 'Haftpapille' of the dorsal side, rostrally. L. Sagital reconstruction of the proboscis and pharynx. D, E, F and G free hand drawings, the others with camera lucida, Magn. A, B, C and L 660x, H-K 1260X.