LIST OF ILLUSTRATIONS 



Fig. paof. 



175. Photographs to one scale of the South American 

 Cariania and the skull of the gigantic extinct 

 Phororachus ....... 240 



17G. Photographs to one scale of the Apteryx, the Ostrich 

 and the giant Moa of New Zealand, each with ite 

 egg 242 



177. The hard bony scales of a Ganoid Fish . . 247 



178. Photograph of a dried skin of the Polypterus of 



the Nile 249 



1 79. A fossil Ganoid Fish, as discovered embedded in rock 260 



180. Outline drawing of the extinct Ganoid FishOsteo- 



leps 251 



181. The Australian Lung-fish Ceratodus . . . 252 



182. The extinct Devonian Fish Dipterus . . . 253 



183. Outline drawings of the extinct fish Pterichthys 254 



184. Photograph of a cardboard model of Pterichthys 255 



185. The upper figure is a restored outline of the curious 



Devonian fish Coccosteus .... 257 



186. Photograph from the original specimen of Ceplialas- 



pis lyeli, preserved in the Natural History 

 Museum ....... 258 



187. Drawings of the head-shield of the fossil fish 



Pteraspis ....... 259 



188. Photograph (of the natural size) of a specimen 



showing parts of the upper and lower head-shields 

 of Pteraspis crouchii, with ten rows of lozenge- 

 shaped scales attached ..... 260 



189. Photographs of models of the Devonian Fish 



Drepanaspis, in the Natural History Museum 201 



190. Outline drawing of the Silurian fish Birkenia 262 



xxi 



