LIST OF ILLUSTRATIONS. 



PAGE 



Table of Chronology of Plants .... {Frontispiece.) 



Protannularia Harknessii 21 



Nematophyton Logani (three Figures) 22, 23 



Trail of King-Crab 28 



Trail of Carboniferous Crustacean . ...... 28 



Rusichnites 29 



Pakeophycus .30 



Astropolithon 31 



Carboniferous Rill-mark 33 



Cast of Shrinkage Cracks 34 



Cone-in- cone 36 



Buthotrephis 37 



Silurian Vegetation . .40 



Erian Plants . .49 



Protosalvinia 54 



Ptilophyton (two Figures) 62, 63 



Psilophyton (two Figures) 64, 66 



Sphenophyllum 65 



Lepidodendron 66 



Various Ferns 72, 73 



Archaeopteris 74 



Caulopteris . . 75 



Megalopteris .... 76 



Calamites # . . . .77 



Asterophyllites . 78 



Dadoxylon . . . , , 6 79 



