BELUGA LEUCAS. 153 



each side towards the front of the lower jaw. The head 

 blunt and somewhat rounded ; dorsal fin rather elevated, 

 placed nearer to the tip of the tail than to the end of 

 the nose; pectorals large, pointed, set on low. Colour 

 blackish above, with many irregular lines of a lighter, 

 colour, white beneath ; at the base of the pectorals is a 

 kind of oval mark of the same shade with the above men- 

 tioned lines on the back. One of the Nice specimens has 

 the dorsal, pectorals, tail, and hinder part of the body- 

 below, varied with black. The females are said to be of 

 a uniform brown colour, with irregular lines, as in the 

 males. 



Entire length, 9 feet ; head, 18J inches ; height of dorsal, 

 9 inches. 



Does not appear to be known anywhere except in the 

 Mediterranean, off the coasts of Piedmont. 



Genus BELUGA. 



The genus Beluga differs from Phoccena only in the 

 absence of a dorsal fin (Cuvier, Keg. Ann.). 



Beluga leucas. 



Beluga leucas, Bell, Brit. Quad. 

 BeVphinus leucas, Desm. Mamm. Sp. 779. 

 Delphinapterus leucas, Gekaud. 

 Delphinapterus albicans, Jenyns, Man. Brit. Vert. 



Description. — Head broad and blunt ; teeth eight or nine 

 on each side, above and below, short and blunt ; the gape 

 is narrow ; the upper jaw a little overhangs the lower ; 

 old individuals are found without any teeth in the upper 

 jaw ; pectoral fins short, thick, oval ; caudal fin very broad 

 and powerful ; no dorsal fin. The colour of the young 

 animal is bluish grey, changing to white with age ; the 

 adult is quite white. 



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