CETACEA OR WHALES. 



115 



have the tail rounded ; others, as the Dugongs (Halicore), 

 and the Stellers (Hhytina), have the tail forked. Those 

 of the last genus are without teeth. 



SUB-SECTION IX. 

 THE ORDER OF CETACEA OR WHALES. 



The name of this order conies from the Greek ketos, a 

 whale. The Cetacea are mammalia which are somewhat 

 fish-like in general appearance, and which are specially 

 adapted for a constant residence in the water. They have 

 their forward pair of limbs paddle-like; and they are 

 wanting in hind limbs and pelvis two small bones sus- 

 pended in the flesh being the only vestiges of hind ex- 



FlG. 123. 



Dolphin, Ddphinus delphis, Linnaeus. 



tremities. The Cetaceans progress mainly by means of 

 their broad and horizontally flattened tail. They are 



