IN THE STRATA OF THE CARBONIFEROUS SERIES. 55 



References to Plates XII. and XIII. illustrative of Lepidodendron. 



PLATE XII. 



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 



parenchymatous tissue, and an oblique section of one of the processes. 

 Enlarged. 



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



more perfect than usual. Enlarged. 



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



and one of the processes. Enlarged. 



8. Transverse section of Lycopodium clavatum. Enlarged. 



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



PLATE XIII. 



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. En- 



larged. 



3. Portion of the same towards the surface, more highly magnified. 



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



5. Portion of a similar section. 



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



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



Having now completed my examination of the fossil vegetables of the 

 Carboniferous Deposits, 1 proceed to the investigation of those of the Lias. 

 It may be useful, however, here to enumerate the results of our examina- 



