INDEX 



Horse — contd. 



Mesohippus, teeth of, 141 



Upper molar tooth of a 

 x'ecent horse, 142 

 Toes and foot : 



Description of bones of 

 fore and hind foot, 134, 

 136 



Living horses occasion- 

 ally born with two toes 

 attached to the splint 

 bones, 139 



Photogi'aphs of modern 

 horse's foot and of 

 foTir-toed and three- 

 toed ancestors, 135, 

 137, 138 



*' Splint-bones," remains 

 in modern horse of two 

 additional toes, 136 

 Hybrids — Okapi as hybrid or 

 " mule " between ze- 

 bra and giraffe theory, 

 164, 165 

 Hyracotherium — ancestor of 

 the horse, 136, 137, 

 139, 140 

 Hyrax, fossil remains found in 

 the Fayum, 125 



Ichthyornis — skeleton of 



toothed bird, 237 

 Ichthyosaurus : 



Excrement, fossilized lump, 

 showing spiral groov- 

 ing, 229 



Extinct order of reptiles, 

 192 



Eyes — third or pineal eye 

 placed on the top of the 

 head, 227, 228 



Ichthyosaurus — contd. 



Fish-like or whale-like ap- 

 pearance, 226, 227 



Head of, from Liassic rocks 

 of Lyme Regis, 6 



Large-paddled ichthyosau- 

 rus preserved in Lias- 

 sic rock, 225 



Offspring of four-legged ter- 

 restrial reptiles, 227 



Size of, 222 



Skeletons, 225, 229 



Young, bringing forth alive, 

 231 

 Iguana — upper jaw showing 

 serrated edges of teeth 

 similar to those of the 

 igvianodon, 200 

 Iguanodon : 



Bones and teeth, discover- 

 ies made by Dr. Gide- 

 on Mantell, 199, 200 



Footprint, supposed, in Isle 

 of Wight sandstone, 

 54 



Foot like that of a bird — 

 stock from which birds 

 have been derived, 202 



Size, shape, etc. — probable 

 appearance in living 

 condition, 198, 199 



Skeletons : 



Complete skeletons dis- 

 covered near Brussels, 

 201 

 Drawing of, 197 



Skull — specimen discovered 

 near Brussels, 201 — 

 photograph, 202 



Teeth showing serrated 

 mai'gin, 199 



310 



