PLATE 3 



EXPLANATION OF FIGURES 



7 Urinogenital system of a normal male embryo, eighteen days old. Rt, It, 

 right and left testis; rwh, Iwb, right and left wolffian bodies; rwd, livd, right and 

 left wolffian ducts; ru, lu, right and left ureters; rk, Ik, right and left kidney. 

 X 4. 



8 Diagram of the urinogenital system of the same embryo. 



9 Urinogenital systems of a normal female embryo, eighteen days old. Lo, 

 left ovary; nnd, lind, right and left mullerian ducts; other abbreviations as in 

 figure 7. X 4. 



10 Diagram of the same embryo. 



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