136 WINIFRED HUGHES. 



PLATE IV. 



FIGS, ii AND 12. Normal and abnormal twins of case No. 4. i, kidney; 2, 

 gut; 3, testis; 4, mesonephros; 5, inguinal fold; 6, umbilical cord; 7, penis; 

 8, allantois; 9, prostatic urethra; 10, scrotal sacs; n, ureter; 12, allantoic artery; 

 13, genital ducts. 



