THE PORPOISE WHALE 55 



Genus Cogia. 

 Teeth iu the lower jaw, 9 to 12 on each side ; slender, pointed, 

 and curved. 



The Pigmy Whale. 



Cogia hreviceps. 

 Black above, greyish white below. Length, 8 to 10 feet. 



Family Ziphiidae. 

 Teeth of the lower jaw rudimentary, except one or two pairs. 

 Head beaked; the blowhole single, median. Skull asymmetrical 

 about the blowholes. 



Key to the Genera. 



Two pairs of teeth at anterior end. Berardius. 



One pair of teeth at the anterior end. Ziphius. 



One pair of teeth near the middle. Mesoplodon. 



Genus Berardius. 

 Two moderate-sized teeth near the end of the lower jaw. Beak 

 about half the length to the eye. Blow hole over the eye. Dorsal 

 fin rounded at the end. New Zealand only. 



Porpoise Whale. 



The Porpoise Whale. 



Berardius arnuxi. 

 Black, with a narrow baud of white along the belly. Length, up to 

 30 feet. 



Genus ZipUius. 

 A single conical tooth on each side of the lower jaw near the 

 end. Beak very small, gradually tapering. Dorsal fin rounded 

 .at the apex. 



