33. " Sigillaria pachyderma 45 34. Sigillaria reniformis 45 35. " pachyderma 46 36. " (Favularia) tessellate 46 37. " pachyderma 46 38. Stigmaria ficoides 47 39. " " (S. anabathra of Corda) 47 40. Bifurcating stem of Lepidodendron obovatum (elegans) 49 41. Stem of Lepidodendron crenatum 49 42. Fructification of Lepidodendron 50 43. Longitudinal section of Fructification of Triplosporites 50 44. (1). Fruit of Selaginella spinulosa, A. Braun (Lycopodium selaginoides, Linn.) 51 (2). Scale and sporangium from the upper part of cone 51 (3). Antheridian microspores from ditto 51 (4). Macrospore 51 (5). Scale and sporangium from lower part of cone, containing macrospores 51 (6). Fruit of Lepidostrobus ornatus (Hooker) 51 (7). Three scales and sporangia of ditto 51 (8). Microspores from sporangia of the upper part of the cone of Triplosporites Brownii, Brongn. 51 (9). Macrospore from the sporangia of the lower part 51 (10). Scales and sporangia of a cone of Flemingites 51 45 _a._ Calamites Suckovii 57 45 _b._ Septum or Phragma of a Calamite 57 46. Vertical stems of Calamites--in coal-measures of Treuil, near St. Etienne 58 47. Fruits of Equisetum and Calamites 60 (1). Equisetum arvense, L. 60 (2). Portion of sporangium wall 60 (3, 4). Spores--elaters free 60 (5). Longitudinal section of part of one side of cone 60 (6). Transverse section of cone 60 (7). Calamites (Volkmannia) Binneyi (Carr.) 60 (8). Portion of sporangium wall 60 (9). Two spores 60 (10). Longitudinal section of part of one side of cone 60 (11). Transverse section of cone 60