CHAPTER XXII =MARATTIALES (FOSSIL).= Pp. 395–411. _Ptychocarpus_ 397; _Danaeites_ 398; _Parapecopteris_ 398; _Asterotheca_ 398–400; _Hawlea_ 400; _Scolecopteris_ 401, 402; _Discopteris_ 402–404; _Dactylotheca_ 404–406; _Renaultia_ 406; _Zeilleria_ 407; _Urnatopteris_ 407; _Marattiopsis_ 407–409; Danaeopsis 409; Nathorstia 410, 411. CHAPTER XXIII =PSARONIEAE.= Pp. 412–426. CHAPTER XXIV =OPHIOGLOSSALES (FOSSIL).= Pp. 427–431. CHAPTER XXV =COENOPTERIDEAE.= Pp. 432–472. I. Botryoptereae 434–443 II. Zygoptereae 443–470 CHAPTER XXVI =HYDROPTERIDEAE AND SAGENOPTERIS.= Pp. 473–483. Marsiliaceae 473–475; Salviniaceae 475–477; _Sagenopteris_ 477–483. CHAPTER XXVII =GENERA OF PTERIDOSPERMS, FERNS, AND= _PLANTAE INCERTAE SEDIS_. Pp. 484–580. _Taeniopteris_ 485–494; _Weichselia_ 494–496; _Glossopteris_ 496–512; _Gangamopteris_ 512–517; _Lesleya_ 517–519; _Neuropteridium_ 519–523; _Cardiopteris_ 523–525; _Aphlebia_ 525–529; _Sphenopteris_ 529–532; _Mariopteris_, _Diplotmema_, _Palmatopteris_ 532–537; _Cephalotheca_ 537; _Thinnfeldia_ 537–544; _Lomatopteris_ 544–546; _Cycadopteris_ 546; _Ptilozamites_ 546–548; _Ctenopteris_ 548–550; _Dichopteris_ 550–552; _Odontopteris_ 552–556; _Callipteris_ 557–559; _Callipteridium_ 560; _Archaeopteris_ 552–565; _Neuropteris_ 565–571; _Cyclopteris_ 571, 572; _Linopteris_ 572, 573; _Alethopteris_ 573–576; _Lonchopteris_ 576; _Pecopteris_ 576–580. INDEX Pp. 609–624 LIST OF ILLUSTRATIONS Several of the illustrations are printed from blocks for which I am indebted to learned societies or to individuals. The sources from which clichés were obtained are mentioned within square brackets. FRONTISPIECE. _Thamnopteris Schlechtendalii_ (Eich.). From a photograph given to me by Dr Kidston and Mr Gwynne-Vaughan. (Page 329.)