1. Sections of Recent Vegetables 55 2. Sections of Fern-Stems 62 3. Nodule of Ironstone, enclosing a Fern Leaf 69 4. Siliceous Frustules of Diatomaceæ, and Spicules of Spongillæ 94 5. Fossil Gallionellæ 96 6. Organic Bodies in Porcelain Earth 97 7. Microphytes from the Tertiary deposits at Richmond, U.S. 98 8. Confervites Woodwardii 101 9. Chondrites Bignoriensis 102 10. Delesserites (Fucoides) Lamourouxii 103 11. Moss and Conferva in transparent quartz 104 12. Equisetum Lyellii 105 13. Equisetites columnaris 106 14. Calamites decoratus 107 15. Calamites in Coal-shale 108 16. Pecopteris Sillimani 110 17. Pachypteris lanceolata 112 18. Sphenopteris elegans 112 19. Sphenopteris nephrocarpa 113 20. Sphenopteris Mantellii 113 21. Cyclopteris trichomanoides 114 22. Neuropteris acuminata 115 23. Glossopteris Phillipsii 116 24. Odontopteris Schlotheimii 116 25. Anomopteris Mougeotii 117 26. Tœniopteris latifolia 118 27. Fig. 1, Pecopteris Murrayana 118 2, Pecopteris lonchitica 118 28. Lonchopteris Mantellii 119 29. Fig. 1, Phlebopteris Phillipsii 120 2, Phlebopteris propinqua 120 30. Clathropteris meniscoides 121 31. Caulopteris macrodiscus 123 32. Base of a Trunk of a Sigillaria, with root 126 33. Sigillariæ, in Coal Shale 128 34. Sigillaria Saullii 129 35. Silicified Stem of Sigillaria elegans 130 36. Stigmaria ficoides 133 37. Transverse section of Stigmaria ficoides 135 38.