118 



NORTH AMERICAN FAUNA 74 



J L 



Fig. 82. Length of the dinical root 

 of the tusks of male (dots) and 

 female (circles) Pacific walruses, 

 in relation to age. Each point 

 represents one specimen. Cur\'es 

 were fitted visually. 



Otj \ L 



10 20 30 



Age (years) 



40 



Total length. — The total length of the tusks is the overall measurement from 

 root apex to distal tip, or the sum of the clinical crown and clinical root. Sexual 

 dimorphism is more apparent here than in the length of the clinical crown alone 

 (Fig. 83). Maximum total length for tusks of males exceeds 1 m; the maximum in 

 females probably is about 80 cm. 



lOOr- 



i " 



0 5 10 15 20 25 30 35 40 



Age (years) 



Fig. 83. Total length of tusks of male (dots) and female (circles) Pacific walruses, 

 in relation to age. Each point represents one specimen. Curves are based on sums of those 

 in Figs. 81 and 82. 



