38 



NORTH AMERICAN FAUNA 74 



1000 



500 



300 

 2 00 



100 



50 



30 

 20 



10 

 8 



^^ 



4 - 

 3 - 



2 - 



a = .181 X lO-'* 

 b= 4.98 



W = aL 



a=.793x 10-"^ 

 b= 3.24 



a = .109 xiO"^ 



b= 1.85 



a = .460x lo-'o 

 b = 4.94 



3 5 8 10 20 30 50 100 



Length (cm) 



80 



Fig. 24. Weight-length relationship of bacula of the Pacific walrus. The constants for 

 each curve (fitted by least squares) are shown at right. 



weight, the differences seldom amounted to more than ± 10 % . Weights and 

 lengths reported here are the means of each pair. 



The growth of the non-spermiogenetic testis in relation to age is shown in Fig. 

 25. The length increases steadily for at least 15 years, and the weight for at least 



