98 



THE CHAIN OF LTFE. 



like leaves^ which modern discoveries would refer to th » same 

 group. As yet we know no Devonian Palms or Grasses ; and 



Fig. 89. — Frond of Archceopteris J acksonH^w.). Devonian, of Maine. 



only a single specimen has been found indicating the existence 



Fig. 90.— Portion of a branch of Leptophleuvi rhombicutn (Dn.). A Lycopodiaceous 

 tree of the Devonian of Maine. Natural size. 



of a plant of the highest vegetable class, that of the true 



^ Cordaites. 



