161 



KEY TO MARINE MAMMALS (Cont. 



5' Underfur present (guard hair hides underfur so that hair must be 

 parted to reveal this thick growth of velvety fur); foreflippers 

 with first digit shorter than second; all digits on hind flippers 

 about equal in length; long hind flippers, about three-quarters 

 the distance from base of hind flipper to armpit; usually six 

 teeth behind canines on upper jaw; nose pointed. (FUR SEALS) 



6 Male (Fig. 32) 

 6' Female (Fig. 32) 



Figure 32. Some morphological differences between male and 

 female pinnipeds. 



UMBILICUS 

 TEATS 



PE:NILE 



OPENING 



BACULUfA 

 VAGINAU 

 OPENING 



SCROTUM 

 ANUS 



