IN THE STRATA OF THE LIAS AND OOLITIC SERIES. 61 



presented by Figs. 6", 7, and 8. of Plate XIV. may be distinct fiom those 

 represented by the other figures. But any one aware of the great diffe- 

 rences in aspect presented by different portions of the same fossil stem, will 

 perceive the difficulty of characterizing species so closely allied as those of 

 the Whitby Lias, from their internal organization alone. I therefore re- 

 nounce the attempt, and feel satisfied with describing two well characterized 

 species, namely, that of the transverse sections of which representations 

 have been given in the lower half of Plate IX., and that represented in its 

 transverse section by Fig. 9, of Plate XIV. 



The former of these fossils, as already mentioned, was found in the up- 

 per lias close to Whitby, and presented marks of branches. The transverse 

 sections, Figs. 1, 2, 3, 4, and 5. of the lower part of Plate IX. shew the 

 tissue of a pine or coniferous tree in the most perfect state of preservation. 

 Let us now turn to Plate XV., where there are three figures illustrative of 

 the same plant. 



Fig. 1. Represents, of a larger size, a small portion of the tissue, as 

 viewed in a transverse slice. The cellules are obstructed towards the outer 

 margin of the annual layer, and are in general remarkably distinct, each 

 being bounded by well-defined walls, and completely separated from the 

 rest. 



Fig. 2. Represents part of a longitudinal slice parallel to the medullary 

 rays, of which traces are seen in the transverse parallel lines that intersect 

 it. The cellules are very regular, and present generally one, sometimes 

 two, series of circular glands or areolae, which are precisely similar to those 

 of recent Coniferse, figured in Plate II. The only difference presented in 

 this kind of section is, that, in the latter, the areolae are always in single 

 series, whereas here they are sometimes in double series, as in the fossil 

 genus Pinites. 



Fig. 3. Represents part of a longitudinal slice perpendicular to the me- 

 dullary rays, four of which are seen. They consist of single series only, as 

 in most of the recent Coniferas, and in their transverse sections, as seen 

 here, exhibit from one to eight cellules. 



In their Fossil Flora, Messrs Lindley and Hutton have proposed 



