134 WINIFRED HUGHES. 



PLATE III. 



FIG. 5. Modified ovary of free-martin, case No. i. 



FIG. 6. Ovary of normal 65 mm. embryo. 



FIG. 7. Testis of male twin case No. i. 



FIG. 8. Modified ovary of free-martin No. 3. 



FIG. 9. Genital ducts of normal male twin, case No. 4. 



FIG. 10. Genital ducts of abnormal male twin, case No. 4. Mes., mesonephros; 

 M.D., mullerian duct; P.S.C., primary sex cords; R., rete; R.O., rete ovarii; 

 R.T., rete testis; S.S.C., secondary sex cords; T.A., tunica albuginea; W.D., 

 wolffian duct. 



