98 THE GEOGRAPHY OF MAMMALS 



found. They are very numerous, and from thirty to forty 

 species have been described, some of them, such as the 

 Diana Monkey (Cercopithecus diana) and Brazza's Monkey 

 (C. hrazzse) remarkable for their beautifully coloured fur. 

 Intermediate between the Guenons and the Macaques of 

 the Oriental Kegion are the Mangabeys (Cercocebus), of 

 which some six species are recognized. Finally, the ter- 

 restrial Baboons (Theropithecus and Cynocephalus) close 

 the Ethiopian series with some eight or ten species. 



Summarizing these results, therefore, we find that the 

 Ethiopian Region is characterized by the exclusive pos- 

 session of eleven families of mammals, namely — 



Orycteropodidae (Aardvark), Protelidae (Aard-wolf), 



Hippopotamidae (Hippopotamus), Potainogalidae (River-shrew), 



Giraffidae (Giraffe), Centetidae (Tenrec), 



Hyracidse (Rock-coney), Chrysochloridae (Golden-mole), 



Anomaluridae (Anomalure), Chironiyidae (Aye-aye), 

 Lophiomyidae (Crested Tree-rat), 



and by the presence of about ninety-nine endemic genera. 



On the other hand, among a considerable number 



of families not represented in this Region, the following 



five are all widely spread elsewhere, and may therefore 



be considered as typical "lipotypes" of the Ethiopian 



Region : — 



Cervidae (Deer). Ursidae (Bears). 



Tapiridae (Tapirs). Talpidae (Moles). 



Castoridae (Beavers). 



Section III. — Subdivision of the Ethiopian Region 



In dividing the Ethiopian Region into Sub-regions, it 

 must be always remembered that one of the Sub-regions 

 far predominates over the others in speciality and distinct- 



