PLATE X 



Lower jaws of Southern Sea Lions, males. Internal aspects. 



Fig. I. Newly born, No. 1087. 



Fig. 2. First year, No. 1090. 



Fig. 3. Second year. No. 1136. 



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. 



