PLATE XIII 



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



Fig. I. First year, No. 1102. 



Fig. 2. Second year. No. 1075. 



Fig. 3. Third year, No. 1078. 



Fig. 4. Fourth year, No. 1023. 



Fig. 5. Fifth year, No. iioo. 



Fig. 6. Sixth year or over. No. 1132. 



