THE LEOPARD SEAL 



249 



(5) Width of maxillae at level of upper canine teeth. 



(6) Width of the anterior margin of the premaxillae. 



(7) Width of nasopharynx near ventral end of the pterygo-palatine suture. 



(8) Alveolar length from the point of bone between the upper canine and the first 

 cheek tooth to the posterior rim of the alveolus of the fifth cheek tooth, usually on the 

 right side. 



IDom. 



Fig. 



10 cm 



Fig. 2. 



Fig. I. Dorsal view of skull, the numbers refer to the numbered measurements in the text. 



Fig. 2. Nasopharyngeal area of skull, the number refers to the measurement bearing the same number. 



MALE SKULLS 



(Plates VIII, IX and X) 



The twenty-eight male skulls vary in length from 313 to 416 mm., and include repre- 

 sentatives of the stages from the first year to full growth and maturity. 



Ossification never reaches the advanced condition found in some Pinnipedia where 

 the skull may become an almost solid mass of bone. It is no more developed in S.S. 4 

 of 416 mm. than it is in 662 which is 25 mm. less. The observable fusions are those of 

 the cranium, in the region of the alveolar parts of the maxillae and premaxillae where 

 they are in contact, and in the maxillo-palatine sutures, but the last are fused in only 

 two male skulls and both of them of the largest size. 



