100 THE GEOGRAPHY OF MAMMALS 



bution of the mammals of Eastern Africa. Many of the 

 animals formerly supposed to be confined to the southern 

 end of the continent, have been shown to extend all 

 through Nyasaland, at least as far north as British East 

 Africa. It will, therefore, be advisable to extend the 

 boundaries of this Sub-region further north. The boundary 

 adopted in this paper, as will be seen by consulting the 

 map (Plate IV., p. 122), runs from Angola in the west, 

 along the southern water-parting of the Congo as far as 

 Lake Tanganyika, passing thence to Kilimanjaro, and so 

 on to the Indian Ocean along the Tana River. 



The rest of Africa, including the Sahara, the southern 

 portion of Arabia, and North-East Africa, will form a fourth 

 Sub-region, which, however, does not contain nearly so high 

 a percentage of endemic genera as the other three. 



The Ethiopian Region may therefore be divided into 

 four Sub-regions as follows : — 



1. The Malagasy Sub-region, including Madagascar and 

 its adjacent islands. 



2. The West African Sub-region, including the great 

 equatorial forest of Central Africa contained in the basins 

 of the western rivers, from the Senegal to the Congo 

 inclusive. 



3. The Cape Sub-region, including all Africa south of 

 the watershed of the Congo on the West and of the Tana 

 on the East coast. 



4. The Saharan Sub-region, consisting (if we exclude 

 the Abyssinian plateau) chiefly of desert, or at any rate 

 of a comparatively dry country, including the Sahara, 

 Eastern Africa as far south as the Tana River, and 

 Southern Arabia. 



