PORPOISES AND DOLPHINS 333 



Prodelphinus malayanus is found in the waters of the East 

 Indies. Its colour is a uniform ashy grey. Teeth number 

 39 in each jaw, and the length attained is upwards of 6 feet. 



The Blue-White Dolphin, Prodelphinus cceruleo-albus , is a 

 stoutly built animal ; the specimen from which the form was 

 described was only 3 feet 10 inches long. True's description 

 states : " Back and forehead dark steel blue. A very dark blue 

 stripe starts from the dorsal fin, and, passing forward, ends 

 abruptly in front. A narrow blue stripe on the sides from the 

 eye to the vent, expanded at the posterior end. Pectoral fins 

 (flippers) blue grey connected by a coloured band with the 

 ring which surrounds the eye. Belly, snout and other parts 

 of the body white." 



It is found on the coast of South America, near the mouth 

 of the River Plate. It has 50 teeth on each side of upper and 

 lower jaws. 



Prodelphinus euphrosyne resembles the last very closely. 

 The back is black, the belly white but, in contrast to the Blue- 

 white Dolphin, the extremities of both jaws are black. A 

 narrow band runs along the side from eye to vent, giving off 

 a short branch in the region above insertion of flipper. As in 

 the Blue-white Dolphin, a black band connects eye and base 

 of flipper, but it has in its centre an area of white. The fins 

 are black with a narrow line of white on their lower margin. 

 Teeth number 45, and the total length of the animal is about 

 8 feet. Its range extends in the Atlantic Ocean from the coast 

 of Europe to South Africa. It has been reported from 

 Jamaica, St. Paul and Ascension Island. There are two recent 

 records of British strandings. 



Genus Sotalia. Fig. 93. 



The genus Sotalia includes a considerable number of species 

 which frequent estuaries and rivers, but a few are to be found 

 in the open sea. They have been given the common name of 

 Long-beaked River Dolphins, but as this leads to confusion 

 with the true Fresh-water Dolphins, a group of cetaceans 

 outside the Delphinidae, its use should be avoided. 



The species of Sotalia are concentrated in tropical seas or 

 rivers of South America, Africa, India and the Far East. 

 None is known from the cold waters of higher latitudes. 



