134 MAMMALS OF THE PACIFIC WORLD 



hour-glass dolphin is five or six feet in length and has a dis- 

 tinct, though short, beak. The white markings on the sides 

 consist of two torpedo-shaped areas, one from above the eye 

 tapering back to the level of the dorsal fin and the other from 

 the base of the tail tapering forward to join or almost join the 

 first. The flippers are black and so is an irregular band from 

 the eye to the tail separating the white of the sides from that 

 of the underparts. The white areas of the sides are connected 

 in front of the eye. This species is found in the southern Pacific. 

 The dusky dolphin of New Zealand and the Falklands has a 

 longer beak than its relatives. The white of the underside ex- 

 tends up on the side to about the level of the eye, and there is a 

 whitish marking on the rear part of the dorsal fin. The back is 

 dark brown. This species is common in the seas around New 

 Zealand. Another species, very poorly known, is reported from 

 the tropical Pacific, but it is known only from the skull. 



Bottle-nosed Dolphins (Tursiops) have high, sickle-shaped 

 dorsal fins, a rather heavy body, swelling forehead above a short 

 beak, and the lower jaw longer than the upper. The upperparts 

 are gray or blackish, the underside white. One species in Aus- 

 tralian waters has the sides, lower surface, and flippers covered 

 with dark blotches. Other species lack these blotches and are 

 found in all temperate and tropical seas. 



The Common Dolphin (Delphinus) has a narrow, relatively 

 long beak (five to six inches) that is sharply marked off from 

 the forehead by a V-shaped groove. The body is black or dark 

 gray, and on each side are undulating bands of whitish, yellow- 

 ish, or gray ; the eye is circled by a ring of blackish and a line 

 connects this with the snout. The upper and lower jaws bear 

 forty to fifty pairs of fine teeth. The common dolphin is about 

 seven and one-half feet long. It is found almost throughout the 

 world. A small, closely related species is the red-bellied dol- 

 phin ( D. roseiventris) found in the Banda Sea and Torres 

 Strait. It is stouter in build, and about three feet ten inches in 

 length. 



