110 THE GEOGRAPHY OF MAMMALS 



Section V. — The West African Sub-region 



The West African Sub-region, as defined above, does 

 not contain nearly so large a proportion of peculiar 

 genera as the Malagasy Sub-region. At the same time, 

 twelve out of a total of eighty genera of mammals that 

 are found within its limits are not met with elsewhere. 

 Moreover, we notice that, as a general rule, the genera 

 inhabiting other parts of Africa are here replaced by 

 distinct species. 



The Edentata are represented by one genus, Manis, 

 the Scaly Ant-eater. Of the four known African species 

 three are confined to this Sub-region. 



Of the Ungulates only one genus is endemic. This is 

 Eyomoschus, a very curious aquatic form, which, together 

 with an allied genus found only in the Oriental Region, 

 forms a peculiar Family (Tragulidse) distantly allied to the 

 deer (Cervidte). Many of the genera of Ungulates, however, 

 are here represented by peculiar species. Instances of this 

 are the Liberian Hippopotamus (Hippopotamus liberi- 

 ensis), the Red River-hog (Potamochcerus penicillatus), the 

 West African Eland (Oreas derbianus), a peculiar species 

 of wild ox (Bos pumilus\ and several species of Rock- 

 coney (Hyrax). 



The Rodents do not present any features of special 

 interest, the only peculiar genera being Deomys (allied 

 to Mus), recently obtained from the Congo district; and 

 the Brush-tailed Porcupine (Atherura), of which one 

 species is found only in this Sub-region, and the other 

 two are confined to South-East Asia. Four out of the five 

 known species of the peculiar Rodent-genus Anomalurus, 



