49 6 Bulletin American Museum of Natural History. [Vol. XVI, 



Island seal, with the dentition heavier than even that of 

 Puget Sound specimens. In the material now in hand it is 

 represented by a single skull (Mus. Comp. Zool. No. 6157), 

 and a stuffed specimen (in the American museum), mounted 

 with the mouth open, displaying the teeth, and by the four 

 San Geronimo Island skulls. That these represent a well- 

 marked subspecies there can be little doubt,, characterized by 

 large size and heavy dentition. 



The table of measurements of 1 2 skulls of Phoca ' vitulina ' 

 (p. 499) from the eastern coast of North America is added 

 for comparison with the Pacific Coast and Bering Sea skulls, 

 from which it will be seen how closely the Atlantic coast 

 skuljs parallel those of the Phoca richardii group in general 

 size and proportions, and also in details. The large size of 

 the few Greenland specimens is also noteworthy in compari- 

 son with those from the New England coast. The first five 

 given in the table are strictly comparable as to age. Most of 

 the New England skulls, however, are young adults. Much 

 more material will doubtless soon be available from the At- 

 lantic coast, when it will be possible to study more satisfac- 

 torily this group of Harbor Seals. 



