IN THE STRATA OF THE CARBONIFEROUS SERIES. 35 



Messrs Lindley and Hutton, in the first volume of their Fossil 

 Flora, p. 9.. Plate II, have described and figured sections of the trunk of 

 1826. Observing that the structure differs in the respects indicated above 

 from the recent Coniferae, but acknowledging an affinity to that family, 

 they have referred it to a genus instituted by themselves, under the name 

 of Pinites, and have honoured me by giving it the specific name of Withami. 

 I see no reason for supposing the great tree of 1830 to be of a different 

 species. 



The fragment described above as having occurred in the early part of 

 1831, is precisely similar in its transverse sections to the two great trunks. 



Fig. 5. Represents a longitudinal section of the elongated cellules 

 parallel to the medullary rays ; and 



Fig. 6. A longitudinal section, in which one of the rays is cut across, 

 and exhibits four series of cellules. 



These sections differ in no essential respects from those already pre- 

 sented. It is therefore probable that the fragment of 1831, was a portion 

 of a tree of the same species. 



Lastly, the branch which occurred in 1831, and of which transverse 

 sections are given in Plate VI. Figs. 5, 6, 7, and 8, remains to be de- 

 scribed. 



The authors of the Fossil Flora have described and figured transverse 

 sections of it. Finding the pith to be " four times greater in diameter 

 than the first zone of wood that surrounds it," they have considered this 

 circumstance as affording a specific character. Having seen no longitudi- 

 nal section, but observing that in the transverse section, the appearance 

 of the tissue is <; as nearly as possible that of the tree" of 1826, they have 

 referred it to the same genus, and named it Pinites medullaris. 



Fig. 7- Represents a longitudinal section parallel to the medullary rays, 

 in which the tissue is seen to be precisely similar to analogous sections of 

 the two great trunks. 



Fig. 8. Represents a longitudinal section parallel to the bark, and is 

 very similar to Fig. 6. of the same plate, which is a section of the fragment 

 of 1831. 



