64 THE HOKSE. 



frequents the sides of wood-clad rugged hills. Spec- 

 imens in which the posterior horn has attained a 

 length as great as, or greater than, the anterior horn 

 have been separated under the name of E. keitloa, 

 but, as already mentioned, the characters of these 

 appendages are too variable to found specific distinc- 

 tions upon. The two-horned African rhinoceros is 

 far more rarely seen in menageries in Europe than 

 either of the three Indian species, but one has lived 

 in the gardens of the London Zoological Society 

 since 1868. Excellent figures from life of this and 

 the other species are published in the ninth volume 

 of the Transactions of the Society. 



2. Burchell's, or the square-mouthed rhinoceros 

 (R. simus), sometimes called the white rhinoceros, 

 though the color (dark slate) is not materially dif- 

 ferent from that of the last species, is the largest 

 of the whole group, and differs from all the others 

 in having a square, truncated upper lip, and a wide, 

 shallow, spatulate form of the front end of the lower 

 jaw. In conformity with the structure of the mouth, 

 this species lives entirely by browsing on grass, and 

 is therefore more partial to open countries or districts 

 where there are broad grassy valleys between the 

 tracts of bush. It is only known in the regions south 

 of the Zambesi, and owing to the causes indicated 

 above has of late years become extremely scarce; 



