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ORDER VI. 

 THE CETACEA. 



THE Cetacea are divided into two very distinct fami- 

 lies, having, in common, the anterior extremities 

 shaped into flippers, and the posterior no longer 

 divided, but forming one horizontal flattened tail. 

 They are destitute of a pelvis, having barely two 

 bones suspended within the muscles, as a rudiment 

 of it. In the first we place the typical or true Ce- 

 tacea ; in the second the herbivorous Cetacea. 



The typical Cetacea^ or whales, are clearly mark- 

 ed by the nostrils, no longer at the point of the 

 snout, but terminating in one or two fistulous aper- 

 tures, at the anterior and upper part of the head. 

 The teeth are all conical or wanting, having in lieu 

 a horny substance, called balein or whalebone. We 

 refer for the details of this order to the Sixth Volume 

 of the Naturalists' Library, and repeat here only the 

 general distribution into BAL^N^E, or Whales, form- 

 ing the genera 



Balcena, or Typical Whales. 



Rorqualus^ Finners or Fin Fish. 



Cachalot, Spermaceti Whales. 



Narwhalus, Narwhal or Sea Unicorn. 





