82 INDEX TO THE PLATES. 



PLATE XII. Lepidodendron Harcourtii. 



Fig. 1. External appearance of the Fossil. Natural size. 



2. Longitudinal section, through the centre, not including the whole breadth. 



Natural size. 



3. Transverse section. Natural size. 



4. Longitudinal section, not through the centre. Natural size. 



5. Transverse section of a part towards the circumference, shewing the pa- 



renchymatous tissue, and an oblique section of one of the processes. 55. 



6. Transverse section, shewing an oblique section of one of the processes 



more perfect than usual. 55. 



7. Part of a longitudinal section, shewing the parenchymatous tissue, and 



one of the processes. 55. 



8. Transverse section of Lycopodium clavatum. 55. 



9. Portion of a longitudinal section of the same plant. 35. 



PLATE XIII. Lepidodendron Harcourtii. 



Fig. 1. Transverse section of another portion of the same fossil stem. Natural 

 size. 



2. Portion of a transverse section, from the axis a, b, to the surface. 12. 



3. Portion of the same towards the surface. 55. 



4% Portion of a transverse section, shewing part of the pith. 55. 



5. Portion of a similar section. 



6. Transverse section of one of the processes. 55. 



7. Oblique section of one of the processes. 55. 



PLATE XIV. Fossil Vegetables of the Lias. 



Fig. 1. Transverse section of fossil wood, from the upper lias, near Whitby. 55. 



2. Transverse section of the same. 55. 



3. Transverse section of fossil wood, from the lias, near Whitbv. 55. 



4. Distorted portion of the same. Transverse. 55. 



