258 AFRICAN RHINOCEROSES < IIAI-. 



Coryndon l that the calf of Eh. simus " always runs in front of 

 the cow, while the calf of Eh. bicornis invariably follows its 

 mother." Both animals of course have two horns, and upon the 

 varying proportions of the horns a large number of " species " have 

 been made in the past. It is stated that the longest horn of the 

 "White Rhinoceros" known measures 56^ inches; while that of 



FIG. 133. Head of Rhinoceros bicornis. 



E. bicornis is shorter, 40 inches being apparently the maximum. 

 But the animal is smaller. 



The possible third African species of Rhinoceros ' 2 has been 

 provisionally named after Mr. Holm wood, and is based upon two 

 horns 41 and 42 inches long, which may be abnormal horns 

 of Eli. bicornis ; but they are thinner and have a smaller pedicel. 



Extinct Rhinocerotidae. The existing Rhinoceroses are thus 

 confined to Africa, to certain parts of the continent of Asia, and 

 to some of the large islands lying to the south of that continent. 

 But formerly the genus, and allied genera, had a wider range. 

 As far back as the Miocene we meet with remains of Rhinoceroses 

 closely allied to existing forms. The more ancient forms have, as 

 is natural, more ancient characters. Thus in Eh. schleiermacJieri 

 of the Miocene, canines appear to have been present. The 

 Miocene Aceratherium, primitive in the absence of horns as its 



1 Proc. Zool. Soc. 1894, p. 329. See also Mr. Selous' paper in Proc. Zool. Soc. 

 1881, p. 275. 



'- P. L. Sclater. Proc. Zool. Soc. 1893, p. 514. 



