CONTENTS. xi 



PAGE 



Archaeocalamites . . . . . . . . . . . 320 



Leafy branches of Calamariae (Annularia, Asterophyllites) .... 322 



Fructifications of Calamariae 324 



Specimens showing fructifications and stems in conjunction .... 338 

 Justification of the division of Calamariae into archegoniate Calamitae and 



gymnospermous Calamodendrae 340 



XIV. Sphenophylleae 343 



External character of the impressions 343 



Anatomy 345 



Fructifications 351 



Affinities with other groups of plants 353 



XV. Remains of stems of doubtful affinity, in which the character of the 



outer surface is unknown 355 



Sigillariopsis 355 



Poroxylon 356 



Lyginodendron 358 



Heterangium 362 



Kaloxylon 363 



Amyelon 363 



XVI. Remains of plants of doubtful affinity, in which the character of 



the surface only is known, while the structure is unknown . .365 



Vertebraria 365 



Aethophyllum 366 



Spirangium 367 



Fayolia, Gyrocalamus, Spiraxis 369 



Williamsonia 369 



List of Publications 373 



