SPECIES OF MAMMALS OF THE PACIFIC AREA 133 



Hope and is fairly common in the Malay region. It is about 

 four and one-half feet long, with a bulging forehead, and has 

 from fifteen to nineteen pairs of teeth in each jaw. 



Right Whale Dolphins (Lissodelphis) were given this name 

 because they have no dorsal fin and thus resemble the right 

 whales. They are small — six or eight feet long — slender, and 

 have a distinct beak. The southern species, found near New Zea- 

 land and southern Australia, has a black back and white lower 

 parts, the white including the beak. The northern species, found 

 in the Pacific from California northward, is black, excepting a 

 white area on the breast and a stripe of white extending from 

 this region to the tail. The right whale dolphins have many 

 small teeth : forty-three on each side of the upper and lower jaws 

 in the southern species ; forty-four pairs in the upper and forty- 

 seven pairs in the lower jaw of the North Pacific form. 



The White-headed Dolphin (Cephalorhynchus) is one of 

 the common New Zealand species. Its body is light gray, with 

 the nose and forehead pure white, gradually passing into the 

 color of the body. It is about four feet long and has thirty-one 

 or thirty-two teeth on each side of the upper and lower jaws. 

 Another species, Hector's dolphin, from the same region, has 

 the beak more developed. Its upperparts are blackish, its under- 

 side white, and a narrow band of white extends back on the sides 

 toward the tail. It is about six feet long and has about thirty 

 pairs of teeth above and below. Related species are found in 

 the waters off the Cape of Good Hope and the southern tip of 

 South America. 



Several species of the genus Lagenorhynchus are found in 

 the Pacific. They have high, sickle-shaped dorsal fins, not un- 

 like those of the killer whale and Grampus, and the beak is usu- 

 ally poorly marked. The white-sided dolphin of the North 

 Pacific Ocean is black above, with an irregular white area on 

 the side, which comes up about to the level of the eye. The flip- 

 pers are black. This dolphin is about seven feet long, and has 

 twenty-seven teeth on each side of upper and lower jaws. The 



