448 



THE CARBONIFEROUS SYSTEM. 



Fig. 167.— Tree Ferns. 



A, Megaphyton magmficum, restored. B', Row of Leaf-scars, reduced. 



B, Leaf-scar of the same, jj nat. size. C, Palfcopteris Ilarttii, scars half nat. size. 



D, Palseopteris Acadica, scars half nat. size. 



