132 MAMMALS OF THE PACIFIC WORLD 



dolphin is found near the coasts of New Zealand and eastern 

 Australia and in the northern Pacific, from California and Ja- 

 pan to the Aleutians. 



The False Killer Whale (Pseudorca) is completely black and 

 more slender in shape than the killer. The long and tapering 

 flippers comprise about one-tenth of the body length. The short 

 dorsal fin is directed backward. Eight to eleven pairs of large 

 teeth much like those of the killer in appearance are found in 

 both jaws. Cuttlefish or squids are the chief prey of this por- 

 poise. The false killer is twelve to fourteen feet in length. It lives 

 in all seas. 



The Irrawaddy Dolphin (Orcella) is about seven feet long. 

 The short head has a bulging forehead and narrow, shelf-like 

 beak. The color is slaty blue. The teeth number twelve to nine- 

 teen on each side of the upper and lower jaws. This dolphin 

 feeds on fishes. It is found in the Straits of Malacca and Ma- 

 cassar and near the shores of the South China Seas. 



The Blackfish or Pilot Whale (Globiocephala) is almost 

 world-wide in distribution. The head is greatly swollen in 

 front, the forehead bulging out above the upper jaw. These 

 whales are about fifteen to eighteen feet in length. The teeth, 

 ten on each side, are located at the front of the jaws. Black- 

 fish live for the most part on squid. Large schools of black- 

 fish occasionally beach themselves without obvious reason. 



Ball's Porpoise {Phoccenoides) has no beak. The body is 

 black, with a large white area on the underside extending to the 

 sides of the hinder half. The teeth are small ; twenty-three are 

 found in the upper jaw and twenty-seven in the lower on either 

 side. This porpoise is found in Alaskan waters south to Cali- 

 fornia, and True's porpoise, a closely related species with the 

 white marking covering most of the sides, is found off Japan. 



The Harbor Porpoise (Phoccena) slate gray and less than 

 six feet long, occurs along the North Pacific shores. 



The Finless Black Porpoise (Neomeris) is found from the 

 coasts of southern Japan and Formosa to the Cape of Good 



