CHAP. XVII.] 



MAMMALIA. 



213 



Europe and North America ; while a still more ancient form of 

 large size is found in the Lower Eocene of France and England, 

 indicating an immense antiquity for this group of Mammalia. 

 There are many other extinct forms connecting these with th e 

 Palseotheridse, already noticed in chapter vi. (vol. i. pp. 119-125), 



FAMILY 45. RHINOCEROTID^E. (1 Genus, 9 Species.) 



GENERAL DISTRIBUTION. 



LIVING SPECIES. 



1.2 .3 



.4 



1.2 



EXTINCT SPECIES. 

 1 .2.3.4 



Living Rhinoceroses are especially characteristic of Africa, with 

 Northern and Malayan India. Four or perhaps five species, all 

 two-horned, are found in Africa, where they range over the whole 

 country south of the desert to the Cape of Good Hope. In the 

 Oriental region there are also four or five species, which range 

 from the forests at the foot of the Himalayas eastwards through 

 Assam, Chittagong, and Siam, to Sumatra, Borneo and Java. 

 Three of these are one-horned, the others found in Sumatra, and 

 northwards to Pegu and Chittagong, two-horned. The Asiatic 

 differ from the African species in some dental characters, but 

 they are in other respects so much alike that they are not gene- 

 rally considered to form distinct genera. In his latest catalogue 

 however (1873), Dr. Gray has four genera, Rhinoceros (4 species), 

 and Ceratorhinus (2 species), Asiatic ; Rhinaster (2 species), and 

 Ceratotherium (2 species), African. 



Extinct Khinocerotidce. Numerous species of Rhinoceros ranged 

 over Europe and Asia from the Post -pliocene back to the Upper 

 Miocene period, and in North America during the Pliocene period 



