.")26 THE DEVELOPMENT OF THE MULLEFJAN DUCT OF AMPHIBIANS. 



Figs. 17 and 18. Sections of Axolotl of 51 mm. in length, showing the undermining and rupture of the 

 epithelial thickening that represents the foundation of the anterior end of the Miillerian duct. 



Fig. 19. Posterior end of foundation of Miillerian duct in Axolotl of 27 mm. 



Fig. 20. Section showing the rod-like foundation of the Miillerian duct, merging in the thickened epithelium 

 near the posterior end of the foundation, in an Axolotl 45 mm. long. 



Figs. 21 and 22. The same in an Axolotl of 51 mm. in length. 



Fig. 23. Section of Salamandra atra 40 mm. long, showing non-terminal connection between the rod-like 

 foundation of the Miillerian duct and the thickened epithelium outside the mesonephros. 

 Ao. = aorta. Al. c. = alimentary canal. Ch. = notochord. C. = coelom. D 1 = dorsal diverticulum. 



D 2 = middle diverticulum. L = lung. M. d. = Miillerian duct. Mes. = mesonephros. N 1 = anterior nephro- 



stome. N 2 = posterior nephrostome. Pr. = pronephros. S. d. = segmental duct. 



