LIST OF ILLUSTEATIONS. 



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 



Paloeophycus 30 



Astropolithon ........... 31 



Carboniferous Rill-mark ......... 33 



Cast of Shrinkage Cracks 34 



Cone-in-cone 36 



Buthotrephis 37 



Silurian Vegetation 40 



Brian Plants 49 



Protosalvinia 54 



Ptilophyton (two Figures) 62, 63 



Psilophyton (two Figures) 64, 66 



Sphenophyllum 65 



ddodendron .......... 66 



arious Ferns 72, 73 



taeopteris 74 



pteris 75 



'egalopteris ........... 76 



Calamites 77 



phyllites 78 



ioxylon . . 79 



