NEW COLONIAL FLOEAS. 



57 



Therefore tlie sum of tbe Ordinal differences between two spots 

 in the tropics of the Old and New World respectively, and containing 

 together upwards of 2000 genera and 5000 species is represented by 

 only about 82 genera and 200 species. 



If again we seek to ascertain the extent to which the dominant 

 Orders are represented in each, we find a further great and remarkable 

 uniformity. More than half the Flowering plants belong to eleven 

 Orders in the case of the West Indies, and to ten in that of Ceylon, 

 whilst with but one exception the Ceylon Orders are the same as 

 the "West Indian, and they follow in nearly the same sequence in each 

 country. 



* The species in each column marked with an asterisk, are confined (in the 

 tropics) to the Old and New Worlds respectively. 



