112 



NORTH AMERICAN FAUNA 74 



Fig. 75. Examples of orientation and shape of walrus tusks, in relation to sagittal and 

 transverse planes of the skull: (a) inclination in anterior view; (b) inclination in lateral 

 view; (c) angle of the long, cross-sectional axis in \ entral view; (d) helical twist in dorsal 

 view; and (e) radius of arc in lateral \'iew. 



