2 3 4 A BOOK OF WHALES 



Blanford as a distinct form. It has 6-7 teeth on 

 each side above and 7-8 below. The pre-maxillae 

 are broad and entirely cover maxilla. Its colour 

 is a uniform leaden black. The length is 14 feet 

 2 inches. The animal goes in shoals, and frequents 

 the Gangetic delta. 



The genus TURSIO must be carefully distinguished 

 from Tur stops. Its characters are : Beak distinct ; 

 no dorsal fin. Teeth small and numerous, 44. 

 Pterygoids separate. 



It is a pity that the name Tursio antedates Leuco- 

 rhamphus, since Tursio is so evidently suggestive 

 of Tursiops, to which genus the present is not so 

 nearly allied as it is to Prodelphinus. The name 

 of " Right Whale Porpoise " has been applied to the 

 dolphins of this genus on account, of course, of the 

 absence of the dorsal fin. The northern T. borealis 

 seems to be only distinguishable from the southern 

 T. peronii by its slightly different coloration ; this 

 does not appear to be a sufficient reason for sepa- 

 rating them. But the matter will not be decided 

 here. The species peronii has a wide range, and 

 is black above and white beneath, the colours joining 

 abruptly. It is southern in range, antarctic in fact, 

 though ranging as far north as New Guinea. 



The genus GRAMPUS* (Plate XX.) has no teeth 



* The derivation of the word Grampus (which has a sdmewhat loose 

 significance when used as an English word, applying also to Orca) is 

 variously given as grand poisson and gras poisson. 



