ACTION OF SEX HORMONES IN FOETAL LIFE 



431 



Fig. 9 Urinogeiiital system of normal female from twin females, pair 5. 

 17 cm. long. Collected February 11, 1915. Chorion was single constricted be- 

 tween the two foetuses. Figure B shows part of the right side X f with the 

 horn of the uterus lifted to show the insertion of the round ligament. Contrast 

 the round ligament of the female with the gubernaculum of the male (fig. 11) 

 to which it corresponds exactly in position. The horns of the uterus begin to 

 show the spiral coil; body of the uterus small ; vagina distended; the urinogenital 

 sinus much shorter than in male (fig. 11). 



A. X ^ i, ovary; 2, round ligament of uterus; 3, vagina; 4, rectum; 5, 

 urinogenital sinus ; 6, clitoris ; 7, fallopian tube ; 8, right horn of uterus ; 9, allantois. 



B. X f . Part of same specimen with horn of uterus raised to show inser- 

 tion of the round ligament. 1, ureter; 2, ovary; 3, right horn of uterus; 4, round 

 ligament; 5, umbilical artery; 6, rectum; 7, body of uterus. 



