140 LECTURE IV. 



carried back to its native waters, and never more 

 appeared. 



It is well known that the common Seal or 

 Phoca vitulina, may also be readily tamed. 



Lastly the round-tailed Manati, a species allied 

 to the former, but smaller, is a native of the larger 

 African rivers ; it grows to the length of fourteen 

 feet, and is of a dark colour, with hair somewhat 

 resembling that of the Seals, and a flat rounded 

 fin at the extremity of the body, formed by the 

 juncture of the webs of the hind-feet : the fore- 

 feet are each furnished with flat and rounded nails. 

 A specimen of this animal exists in the Levenan 

 Museum. 



CETACEA. 



HAVING taken a slight survey of the pinnated 

 or web-footed quadrupeds, we are led by a kind of 

 natural transition to the Cetaceous Mammalia or 

 Whales. These cannot in strict propriety be called 

 Quadrupeds, since they are in reality furnished 

 with only two feet, which have the appearance of 



