have successively occupied the surface of the Earth, 79 



Adiantites 6 



Sphenopteris 30 



Hymenophyllites 6 



Trichomanites 1 



Taeniopteris 2 



Desmophlebis 3 



Alethopteris 13 



Callipteris 4 



Pecopteris 80 



Coniopteris 7 



Cladophlebis 8 



Oligocarpia 1 



Scolicopteris 1 



Chorionopteris 1 



Asterocarpus 3 



Hawlea 1 



Senftenbergia 1 



Woodwardites 1 



Lonchopteris 2 



Glossopteris 2 



Schizopteris 1 



? Aphlebia 1 



** Petioles. 



Zygopteris 1 



Selenopteris 4 



Gyropteris 1 



Anachoropteris 2 



Ptilorachis 1 



Diplophacelus 1 



Calopteris ,. 1 



Tempskia 4 



*** Stems. 



Caulopteris 6 



Protopteris 2 



Zippea 1 



Asterochlaena 1 



Karstenia 2 



Lycopodiace^. 



§ 3. Lepidodendrece. 



Lepidodendron 40 



Lepidostrobus 8 



Lepidophyllum 8 



Ulodendron 9 



Megaphytum 4 



Halonia 3 



Lepidophloios 3 



Knorria 2 



§ 4. PsaronietB. 



Psaronius 30 



Heterangium 1 



Diplotegium .^ 1 



EaUISBTACEiB. 



Equisetites 3 



Calamites 10 



Gyiiinospennous Dicotyledoixs. 

 ASTEROPHYLLITEB. 



Calamodendron 6 



Asterophyllites 20 



Hippurites 1 



Phyllotheca 1 



Annularia 5 



Sphenophyllum 8 



SiGILLARIEiB. 



Sigillaria 35 



Stigmaria 6 



Syringodendron 2 



Diploxylon 1 



? Ancistrophyllum. 1 



? Didymophyllum 1 



NCEGGERATHIE^. 



Noeggerathia 10 



Pycnophyllum 2 



Cycadb^. 



? Colpoxylon *1 



? Medullosa 2 



CONIFERJS. 



Walchia 4 



Peuce 1 



Dadoxylon 7 



Palaeoxylon 2 



Pissadendron 2 



Angiospermous Dicotyledons. 

 None. 



Monocotyledons. 



Very doubtful and imperfectly 

 known. 



Musaeites primgevus J 



Cromyodendron radicans 1 



Palmacites carbonigenua 1 „ 



leptoxylon J 



Myeloxylon (Medullosa elegans) 1 



Musoearpura 2 



Trigonocarpum 7 



By summing up these numbers, and avoiding at the same 



