PLATE IX 



Skulls of Southern Sea Lions, males. Ventral aspects. 



Fig. I. Newly born, No. 1087. 



Fig. 2. First year, No. 1090. 



Fig. 3. Second year, No. 11 36. 



Fig. 4. Third year. No. 1109. 



Fig. 5. Fourth year, No. 1106. 



Fig. 6. Fifth year, No. 1135. 



Fig. 7. Sixth year or over. No. 1079. 



