PLATE XVIII 



Fig. I. Sei whale. Female. Ventral view, showing body proportions 

 and distribution of pigmentation. Note ventral grooves stopping short 

 of umbilicus. 



Fig. 2. Sei whale. Female. Ventral view. Note distribution of pigment, 

 anchor mark or chevron on posterior part of ventral grooves, and white 

 umbilical splash. 



