CHAPTER XVI : KEY TO THE PRINCIPAL 

 CETACEA DESCRIBED IN THIS BOOK. 



The arrangement of this key is similar to that for the 

 identification of fishes. For the method of using it the reader 

 is referred to p. 188 supra. 



1. Whalebone present (Whalebone Whales). 



a. Upper border of lower lip much arched. Surface of 

 throat not grooved externally. Whalebone long and 

 narrow. 

 B. Dorsal fin absent. Size up to 60 feet. 



c. Chin white. Head one-third total body length 



Greenland Right Whale (p. 205). 

 cc. Chin not white. Head one-quarter total body 

 length. " Bonnet " on head 



Black Right Whales (p. 211). 

 bb. Dorsal fin present. Size less than 30 feet 



Pigmy Right Whale (p. 217). 

 aa. Mouth and upper border of lower lip not greatly arched. 

 Whalebone short. Throat with grooving externally. 

 d. Only 2 to 4 grooves on throat. No dorsal fin 



Californian Grey Whale (p. 249). 

 dd. Numerous grooves on throat. Dorsal fin present. 

 e. Flippers extremely long, one-third length of body. 

 Lower margin of flippers scalloped 



Humpback Whale (p. 242). 

 ee. Flippers much less than one-third body length. 

 Not scalloped below. 

 F. Whalebone plates yellowish-white, or slate 

 coloured, or both. 

 G. Size up to 33 feet. Whalebone and whalebone 

 fringes all white or yellowish. A white area 

 on the outer side of flipper 



Lesser Rorqual (p. 231). 



