Part 4

18. Fructification of Equisetum maximum 31

19. Polygonal scale of Equisetum 32

20. Spore of Equisetum--filaments contracted 32

21. " " " expanded 32

22. Marsilea Fabri 33

22 bis. Adiantites Lindseæformis 41

23. Pecopteris (Alethopteris) aquiline 43

24. " (Alethopteris) heterophylla 43

25. Neuropteris Loshii 43

26. " gigantean 43

27. " acuminate 43

28. Sphenopteris affinis 43

29. Cyclopteris dilatata 43

30. Stem of Caulopteris macrodiscus 44

31. " " Balfouri (Carr.) 44

32. " " Morrisi (Carr.) 44

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