THE RIGHT WHALE AND BOWHEAD 



belt of tropical water at the Equator, and that the 

 right whales of the northern and southern hemispheres 

 are thus definitely separated. Acting upon the suppo- 

 sition that since there could be no communication be- 

 tween them these whales must certainly have become 

 differentiated enough to form distinct species, each 

 has been given a scientific name. 



In the light of present knowledge, however, this 

 apparent separation cannot be considered sufficient 

 ground for dividing the right whales into northern and 

 southern species, unless a critical comparison of their 

 external and internal anatomy reveals constant dif- 

 ferences. 



