OF THE FOSSIL PLANTS OF THE COAL-MEASTTBES. 
79 
PLATE III. 
Fig. 14. Tangential section of the peripheral margin of a nodal cortical disk with 
sections of leaves, magnified 30 diameters. 
Fig. 15. Longitudinal hut slightly tangential section of part of the outer prosenchymatous 
bark, exhibiting a longitudinal section of a leaf prolonged from the margin of 
the nodal disk, magnified 30 diameters. 
Fig. 16. Slightly oblique transverse section of a branch passing through a nodal foliar 
disk, so as to intersect the verticil of leaves on the left of the section, mag- 
nified 30 diameters. 
Fig. 17. Series of transverse sections of leaves, magnified 30 diameters. 
Fig. 18. Transverse section of a young twig of Asterophyllites or Sjohenophjllum from 
Burntisland, corresponding to fig. 1, magnified 30 diameters. 
Fig. 19. Similar section to fig. 18, but slightly oblique, and exhibiting two of the three 
superficial cortical grooves, magnified 30 diameters. 
Fig. 20. Transverse section of a branch from Burntisland, with three or four exogenous 
layers, magnified 30 diameters. 
PLATE IV. 
Fig. 21. Transverse section of a more matured stem from Burntisland, magnified 30 
diameters. 
Fig. 22. Tangential section of part of the exogenous zone of fig. 21, showing the inter- 
sected extremities of the medullary rays, magnified 130 diameters. 
Fig. 23. Eadial longitudinal section of part of the same zone as fig. 22, made in the 
plane of the medullary rays, magnified 130 diameters. 
Figs. 24 & 25. Portions of the barred vessels of fig. 23, magnified 420 diameters. 
PLATE V. 
Fig. 26. Fragment of Sphenophyllum Schlotheimi. k', lower portion of the internode 
k, with its lateral groove and the bases of a verticil of leaves. 
Fig. 27. Transverse section of part of a stem from Burntisland, giving off a branch, 
magnified 30 diameters. 
Fig. 28. Transverse section of Volkmannia Dawsoni , a fruit of Asterophyllites or 
Sphenojohyllum, magnified 7^ diameters. 
Fig. 29. Central vascular axis of fig. 28, magnified 22 diameters. 
Fig. 30. Three spores like those of fig. 28, magnified 140 diameters. 
Fig. 31. Single strobilus of ALsterop hyllites from a bed of shale at Brooksbottom, mag- 
nified 2 diameters. 
Fig. 32. Fruiting stem of an Asterophyllites from the Lancashire Coal-measures. 
Natural size. 
