PLATE XLII 



Fig. I . Uterine mucosa of immature whale. 



Fig. 2. Uterine mucosa of adult whale neither pregnant nor lactating. 



Fig. 3. Uterine mucosa during early pregnancy. 



Fig. 4. Uterine mucosa during early lactation. 



Fig. 5. Uterine mucosa of whale in which ovulation had recently taken 

 place. 



