198 



NORTH AMERICAN FAUNA 74 



20 



100 



80 



60 



cr 



i 40 

 s 



o 



20 



J \ \ I 



0 L_ qLoVi'^ 1 \ \ \ \ L. 



MJ J ASONDJ FMAM 



Month 



Fig. 118. Crown-rump lengths of 

 Pacific walrus embr\os and fetuses 

 (circles) and newborn calves 

 (dots), in relation to time of col- 

 lection. From data of Belopolskii 

 (1939), Krylov (1969), and J. W. 

 Brooks, J. J. Burns, and F. H. 

 Fay (unpublished data). Cur\-e 

 was fitted visually. 



^ose to Tail Length (NIL) 

 Crown to Rump Length (CRL) — ^ 



Standard Length (Std L) 



Fig. 119. The three methods of measurement used for describing the growth of walrus 



