APPENDIX 



The bones of the skull are elevated to form a high crest 

 above and behind the nares. The rostrum is very massive 

 and wide, but gradually tapers to the apex, and is concave. 

 Lower jaw very long and narrow. Atlas free, but all the 

 other cervical vertebrae united into a solid mass. Vertebral 

 formula: cervicals 7, dorsals n, lumbars 8, caudals 24. 

 Total, 50. Habitat : cosmopolitan, in warm currents. 



KILLER WHALE, ORCA, GRAMPUS, THRESHER 

 Orca orca (Linn.) 



Form robust. Head pointed. Heavy pointed conical teeth 

 in both jaws. An extremely high dorsal fin. The color is 

 black, with an elliptical white spot on each side of head. 

 The throat and breast are white and there is a trident-shaped 

 area of white on the belly and flanks. A white or grayish 

 patch is usually present just behind the dorsal fin. The 

 flukes above are black, and below white except for a black 

 band on the posterior margins and tips. Greatest length, 

 30 feet. 



Rostrum about equal in length to the cranial part of the 

 skull, broad and flattened above, rounded in front. Teeth 

 usually twelve in each jaw. Vertebral formula: cervicals 7, 

 dorsals 11-12, lumbars 10, caudals 53. Total, 51-52. Habi- 

 tat: cosmopolitan. 



WHITE WHALE, BELUGA, MARSOUIN BLANC 

 Delphinapterus leucas (Pallas) 



Form robust. Head very small and marked off from body 

 by an ill-defined neck. No dorsal fin. Pectoral fins very 

 broad and upturned. The color is pure white in the adult, 

 except for a very narrow band of brownish on the edges of 

 the flukes and flippers. The young are entirely brownish. 



Skull rather narrow and elongated. Eight to ten teeth in 

 both jaws cervical vertebrae all free. Vertebral formula: 



