438 



FRANK R. LILLIE 



Fig. 16 Sterile free-martin 6, 16.3 cm. long. X t- (Cf. fig. 11 for male 

 twin.) Gubernacula are somewhat smaller than in the male (fig. 11). Small 

 gonads (cf. figs. 9 for normal size, and fig. 7 of Chapin for histological structure). 

 The urinogenital sinus is intermediate in length between male and female (fig. 

 9); no seminal vesicles. 1, kidney; 2, gonad; 3, rectum; 4, Wolffian duct; 5, 

 gubernaculum; 6, urinogenital sinus; 7, clitoris; 8, umbilical artery; 9, allantois. 



