CONTENTS 



PAGE 



4. Heterangium tiliaeoides . . 411 



5. Habit ... 414 



III. Affinities of Lyginodendreae 418 



CHAPTER XI 

 pteridospermeae — continued 



Medulloseae ; Aneimiteae ; Seed-bearing Pecopterideae ; 

 Other Cycadofilices 

 Medulloseae — 

 Habit 



Anatomy — Medullosa 

 „ Sutcliffia . 



Fructification of Medulloseae 

 Affinities of Medulloseae 

 Aneimiteae 

 Seed-bearing Pecopterideae 



425 

 428 



447 

 45° 

 463 

 465 

 466 



Summary on the Pteridosperms . 47 1 



Other Cycadofilices . 473 



Megaloxyleae . . -474 



Calamopityeae 47° 



Cycadoxyleae • 483 



Protopityeae . . 494 



Cladoxyleae • • 496 



CHAPTER XII 



THE CORDAITALES 



Poroxyleaej Pityeaej Cordaiteae 



I. Poroxyleae 5°° 



II. Pityeae 5 '4 



III. Cordaiteae 5 l8 



1. External Characters . • ■ 5 Z 9 



