THE BRIAN OR DEVONIAN FORESTS. 



FIG. 15. Vegetation of the Devonian period, restored. Calamites^ Psilo- 

 phyton, eptop?ileum, Lepidodendron, Cordaites, Sigillaria, Dadoxy- 

 lon. Aster ophyllites, Platyphyllum. 



raised as to the share of spores and spore-cases in the ac- 

 cumulation of coal, a question to be discussed in a sub- 



E 





