130 



NORTH AMERICAN FAUNA 74 



Fig. 90. Examples of abraded surfaces of tusks of Pacific walruses: left, anterior aspect, 

 showing pitted surface; center, lateral aspect, with diagonal striae on the tusks of a 

 10-year-old female: and right, polished tip on the posterodistal aspect of the tusks of a 

 25-year-old female. (Photos by F. H. Fay) 



