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perissodactyl, division that the six-horned Dinocerata belong, 

 although they possess some features of each family and tend to 

 unite them, as was long-ago predicted of the earlier fossil forms of 

 Mammalia. The wonderful type genus Dinoceras mirabile, " in 

 his habit as he lived " clothed in skin, muscles, and flesh, stood 

 over six feet high, measured three feet across the loins, fourteen 

 feet from snout to tail, and is said to have weighed not less than 

 six thousand pounds, or nearly three tons. 



A detailed account of the six-horned Dinocerata was given. 

 They may be briefly described as animals with strong solid leg 

 bones, large limbs, and padded five-toed feet, very like those of 

 the elephant, to which they bore a strong resemblance when 

 walking, although having a neck much longer and more flexible 

 than that animal ; the long prehensile nose or trunk was not 

 developed. Abundant remains of these great beasts have been 

 found iu the picturesque wilds of the " Bad Lands " of Western 

 Wyoming, and have been brilliantly described and illustrated by 

 Professor 0. C. Marsh. 



These bulky and sluggish animals had their day, and it was 

 evidently a long one. At the close of the middle Eocene they 

 died out, leaving no direct descendants. The great changes of 

 climate ensuing on the elevation and drainage of the region they 

 frequented, and the hardening of the soil consequent thereon, 

 led to their extinction, as their slow movements, small brain 

 power, and fixed characters rendered them unfitted for survival 

 under less favourable conditions and surroundings. The 

 Dinocerata were the ancient representatives of a type of hoofed 

 ammals, possibly still continued by the existing elephants and 

 ■hinoceroses now found chiefly in the vicinity of tropical jungles, 

 iver courses, forests, and swampy ground. Both these races 

 re doomed to speedy extinction, and it seems probable that the 

 horse and its allies, tlie most changed and modified of all the 

 ungulates, so far as the structure of the feet and teeth are 

 concerned, will evidently be the only linear representatives of 

 the older and once dominant line of " odd-toed " ungulates. 

 'I'he oldest and ancestral type of this ancient order is that 

 singular five-toed creature named by Cope Phenacodus, of which 

 two species are known from the Wasatch Eocene, North 

 Wyoming. This genus is allied to the early proboscidians, and 

 by Sir W. Flower it is considered as an early ancestor of the 

 horse, whether represented by the swift pace of a Ladas or the 

 remarkable by-the-hour gait of that noble animal, the Brighton 

 cabhorse. 



