458 



THE CARBONIFEROUS SYSTEM. 



Fig. 172. — Cordaites and Diplotegium. 



A, Cordaites borassifolia restored. 

 A'. Portion of stem. 



A-, Portion of leaf, enlarged. 



A3, Base of leaf. 



AS Point of leaf. 



A^ Transverse section of stem, showing axis. 



B, Fragment of stem of Diplotegium retusum. 

 B', Scar of do. enlarged. 



