56 



NORTH AMERICAN FAUNA 74 



Table 8. Size of primary hairs and numbers of hairs in three pelages 



of the Pacific walrus. 



Pelage'* 



Length (i 



Exposed 

 shaft 



mm) 



Diameter (/^m) 



Density 



Pores ( % ) with differ- 

 ent numbers of hairs 



Root 



Basal Medial Distal 



(no./cm^) 



1 hair 2 hairs 3 hairs 



Lanugo 



3-6 



1-2 



13-16 20-30 4-6 



2,200-2,400 



89 10 1 



Natal 



5-10 



2 



26-36 21-83 3-6 



680-1,260 



91 9 <1 



Adult 



7-12 



3 



35-105 55-231 20-30 



113-142 



92 8 <1 



'^Data from two specimens in each pelage. 



a 



Fig. 38. Comparative appearance of the pelages of the Pacific walrus, as seen in sagit- 

 tal sections of dried skins: (a) lanugo, at 6 months post-implantation; (b) natal, at birth; 

 (c) natal, about 1 month after birth; (d) adult female. Anterior at left, posterior at right. 

 (Photos by G. C. Kelley) 



