266 ORDER VI. 



Diodon, Two Toothed Whales. 



Hyperoodon, Bottle Nosed Whales. 



Aodon, or Toothless Whale of Havre. 



Zipheus, a Fossil Species. 



The Delphinice^ with teeth in hoth jaws. 



Beluga, White Whale, of which we think the 

 " Poisson Blanc" of the St. Lawrence distinct from 

 the large open sea species. 



Delphinapterus, Dolphin without back fin. 



Globicephahts, Round Headed Dolphin. 



Phocoena, The Porpoise. 



Delphinus, the Dolphin. 



DelphinorhyncuS) Long Billed Dolphin^ 



Soosoo, Gangetic Dolphin. 



Ima, Inia of Bolivia. 



Oxypterus, Rhinoceros Whale. 



The second family contains the herbivorous ce- 

 tacea already described in the Eighth Volume of 

 this Work. They are distinguished from the true 

 cetacea by the want of blow holes, which, in the 

 skull, indeed, are pierced upwards, but still are nos- 

 trils opening in the snout. Their teeth have flat 

 crowns ; which circumstance determines their her- 

 bivorous character. The head is scarcely separated 

 from the body by a neck, and the body fish-like, 

 having an horizontal tail instead of posterior extre- 

 mities. We arrange them in an inverse order from 

 the cetaceous genus RYTINA. The Stelleri, who 

 appear to have only one molar on each side, above 

 and below, a very simple stomach, and are even 

 destitute of the small nails on the anterior flippers. 



