57 



agrees in many points with the northern fauna of the Old World, and 

 has been united with it by some authors ; but its peculiar types, and 

 those which it shares with South America, are too numerous for such au 

 arrangement. Its relations are exhibited in the following table : 



The special peculiarities of the Xearctic region are then chiefly seen 



lin the Fishes and Batrachia. In Birds and Mammals, its prominent 



[divergences from the northern regions of the Old World are seen in the 



nuinerons representatives of forms which are characteristically South 



