LIST OF ILLUSTRATIONS 



Fig. page 



82. Drawing representing the probable appearance in 



Hie oi the Tetrahelodon angustidens . . .119 



83. A drawing of the head of Tetrahelodon angustidens 



with open mouth and upUfted "trunk.". . 121 



84. Drawing of the head of the African Elephant, with 



upUfted trunk 122 



85. A scene in the Fayuni Desert, showing the remains 



of sihcified trees, embedded in the sands . .124 



86. Profile views of a series of Elephant ancestors, from 



drawings by Dr. Andrews . . . .126 



87. Lower jaws of extinct Elephants, from drawings by 



Dr. Andrews . . . . , . .128 



88. Profile and palatine views of the skull of Meri- 



theriuni Lyonsi, as restored by Dr. Andrews . 129 



89. The Meritherium, discovered by Dr. Andrews . 130 



90. Photograph of a model of a thorovighbred English 



horse, by Vashtag . . . . . .133 



91. Hind- and fore-foot of an English cart-horse . 135 



92. Hind-foot and fore-foot of the horse-ancestor, 



Hyracotherium . . . . , .137 



93. The hind- and the fore-foot of Hipparion, one of the 



three-toed ancestors of the horse . . .138 



94. The skeleton of Hyracotherium, an ancestor of the 



modern horse, fovmd in Eocene strata. . .139 



95. Restoration of the probable appearance of the 



Hyracotherium . . . . . .140 



96. Skeleton of the Phenacodus, a five-toed Eocene ani- 



mal, related to the ancestor of the Horse . .141 



97. Cheek-teeth or molars of the upjDer and lower jaw, 



left side, of Mcsohippus Bairdii, from the Middle 

 Oligocene of South Dakota . . . .141 



