PLATE IV. 



DIAGRAMMATIC REPRESENTATION OF THE DEVELOPMENT OF THE GENITO- 

 URINARY SYSTEM, THE WOLFFIAN BODY AND ITS DERIVATIVES 

 BEING COLORED RED, THE MULLERIAN DUCT AND ITS DERIVATIVES, 

 GREEN (Heisler): 

 i, Indifferent type; 2, indifferent type, later stage, the Wolman and 



Miillerian ducts and the primitive ureter now opening into the urogenital 



sinus; 3, male type, lower ends of Miillerian ducts fused to form the sinus 



pocularis; 4, female type. 



