Table of Chronology of Plants (Frontispiece.) Protannularia Harknessii 21 Nematophyton Logani (three Figures) 22, 23 Trail of King-Crab 28 Trail of Carboniferous Crustacean 28 Rusichnites 29 Palæophycus 30 Astropolithon 31 Carboniferous Rill-mark 33 Cast of Shrinkage Cracks 34 Cone-in-cone 36 Buthotrephis 37 Silurian Vegetation 40 Erian Plants 49 Protosalvinia 54 Ptilophyton (two Figures) 62, 63 Psilophyton (two Figures) 64, 66 Sphenophyllum 65 Lepidodendron 66 Various Ferns 72, 73 Archæopteris 74 Caulopteris 75 Megalopteris 76 Calamites 77 Asterophyllites 78 Dadoxylon 79 Cordaites 81 Erian Fruits 82 Foliage from the Coal-formation 111 Sigillariæ (five Figures) 112-114 Stigmariæ (two Figures) 115 Vegetable Tissues 117 Coals and Erect Trees (two Figures) 118, 119 Lepidodendron 120 Lepidophloios 121 Asterophyllites, &c. 122 Calamites (five Figures) 123-125 Ferns of the Coal-formation (six Figures) 126-129 Noeggerathia dispar 130 Cordaites 131 Fruits of Cordaites, &c. 132 Conifers of the Coal-formation (four Species) 135