BOTANY SCHOOL, CAMBRIDGE. _March_ 12, 1910. TABLE OF CONTENTS CHAPTER XII =SPHENOPHYLLALES= (continued from Volume I.). Pp. 1–16. PAGE _Sphenophyllum_ 1–7 _Cheirostrobus_ 7–12 =Sphenophyllales and Psilotaceae= 12–16 CHAPTER XIII =PSILOTALES.= Pp. 17–29. _Psilotum_ and _Tmesipteris_ 17–24 Fossils described by authors as being closely allied to _Psilotum_ 24–26 _Psilophyton_ 26–29 CHAPTER XIV =LYCOPODIALES.= Pp. 30–91. =Recent Lycopodiales= (General) 30–33 Lycopodiaceae (Recent) 33–49 Selaginellaceae (Recent) 49–58 Isoetaceae (Recent) 58–66 =Fossil Lycopodiales= 66–91 Isoetaceae (Fossil) 66–68 _Pleuromeia_ 68–73 Herbaceous fossil species of Lycopodiales 73–91 _Lycopodites_ 76–84 _Selaginellites_ 85–88 _Lycostrobus_ 88–91 _Poecilitostachys_ 91 CHAPTER XV =ARBORESCENT LYCOPODIALES.= Pp. 92–195. =Lepidodendron= 93–181 i. General 93–97 ii. Leaves and Leaf-cushions 97–105 iii. _Lepidophloios_ 105–109 iv. The anatomy of _Lepidodendron vasculare_ 109–123 v. Lepidodendron stems as represented by casts and impressions of partially decorticated specimens 123–128 _a._ _Knorria_ 124–126; _b._ _Bergeria_ 126, 127; _c._ _Aspidiaria_ 127, 128. vi. Lepidodendroid axes known as _Ulodendron_ and _Halonia_ 128–139 _a._ _Ulodendron_ 128–135; _b._ _Halonia_ 135–139.