ILLUSTRATIONS 



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

 FRONTISPIECE . .... Alice B. Woodward 



CAMBRIAN PERIOD 



MOB 



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 



OSTRACODBRMS . . . ,, . 36 



DEVONIAN PERIOD 



OSTRACODBRMS AND ARTHRODIRAN FISHES . Alice B. Woodward 38 

 SHARKS AND GANOIDS . . ,, . 40 



CARBONIFEROUS PERIOD 



VEGETATION . . ... Ernest Bucknall 50 



STBGOCBPHS . . . . ,, 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 



