ILLUSTRATIONS 



The plates marked with an asterisk appeared in "Nebula to Man."^ 



Frontispiece . ... Alice B. Woodward 



CAMBRIAN PERIOD 



PAGE 



Marine Invertebrate Life . . . Alice B. Woodward 19 



ORDOVICIAN PERIOD 

 Marine Invertebrate Life . . . Alice B. Woodward 22 



SILURIAN PERIOD 



Marine Invertebrate Life . . . Alice B. Woodward 34 



Ostracoderms . . . . ,, ,, . 36 



DEVONIAN PERIOD 



Ostracoderms and Arthrodiran Fishes . Alice B. Woodward 38 

 Sharks and Ganoids . . . ,, ,, . 40 



CARBONIFEROUS PERIOD 



Vegetation . . ... Ernest Bucknall 50 



Stegocephs . . . . . ,, ,, . 59 



PERMIAN PERIOD 



Pareiasaurus and Inostransevia . Alice B. Woodward 61 



Edaphosaurus . . . . ,, ,, . 63 



Ganoids and Invertebrates . . . ,, ,, . 64 



TRIASSIC PERIOD 

 Vegetation . ... Ernest Bucknall 70 



Ichthyosaurs . ... Alice B. Woodward 79 



JURASSIC PERIOD 



* Marine Invertebrate Life . . Alice B. Woodward 86 



Vegetation . ... Ernest Bucknall 88 



xi 



