PLATE 4 



EXPLAXATIOX OF FIGURES 



11 Urinogenital system of embryo no. 27-6, modified by testis graft. Rg, Ig, 

 right and left gonads; rwb, Iwb. right and left wolffian bodies; rwd, Iwd, right and 

 left wolffian ducts; rmd, Imd, right and left miillerian ducts; ru, lu, right and left 

 ureters. Same abbreviations used in all subsequent figures. X 3. 



12 Diagram of the urinogenital system of the same embryo. 



13 Urinogenital system of embryo no. 31-3, modified by testis graft. X 3. 



14 Diagram of the urinogenital system of the same embrvo. 



48 



