360 THE ANATOMY OF VEKTEBRATED ANIMALS. 



In all those respects in which Ancliitherium departs from 

 the modern Equine type, it approaches that of the extinct 

 Palwotheria ; and this is so much the case that Cuvier 

 considered the remains of the Anchitherimn with which he 

 was acquainted to be those of a species of Palceotherium. 



h, In the Rliinocerotidce the second, third, and fourth 

 toes are nearly equally developed in both the fore and the 

 hind feet, 



mt, J J. 1 * 1 . . 1-1 . 0-0 0-0 4-4 3-3 



The dental lonnma is i. -— or i. —„ c. —- p.m. —-: m. -—■ 



1*1 U'O 0*0 -*■ 4*4 3*3 



But the teeth differ from those of the Horse in many 

 other respects besides the number of the incisors and the 

 absence of canines. Thus, the upper incisors differ greatly 

 in form from those which are situated in the lower jaw ; 

 and, in some species, incisors are absent. Their crowns are 

 not folded as in the Horse. The peculiarities of the 

 grinding teeth will be mentioned below. 



The skin is very thick and may be converted into a 

 jointed armour; the hair is scanty. The upper lip is 

 mxich produced and is very flexible. In some species one, 

 or sometimes two, horns are attached in the middle line to 

 the nasal or frontal bones. But these horns are formed, as 

 it were, by agglomeration of a great number of hair-like 

 shafts. 



The distal phalanges of the tridactyle feet of the Rhi- 

 noceros are invested by small hoofs; but these do not 

 entirely support the weight of the body, which rests, in 

 great measure, upon a large callous pad developed from the 

 under face of the metacarpal and metatarsal regions ; these 

 are much shorter than in the Horse. 



The dorsolumbar vertebrae are twenty-two or twenty-three, 

 of which twenty are dorsal. There are four sacral and 

 twenty-two caudal. The cervical vertebrae, as in the Horse, 

 are strongly opisthoccelous, and the transverse processes 

 of the last lumbar articulate with those of the penultimate 

 lumbar and with the sacrum. 



The skull differs from that of the Horse in the absence 

 of any frontal or zygomatic processes, in consequence of 



