IN THE STRATA OF THE LIAS AND OOLITIC SERIES. 63 



minute reticulations or granules, and one of the medullary rays, which 

 have cellules always in a single series, and varying from ten to twenty or 

 more. 



This species I would honour with the name of an esteemed friend. I 

 therefore propose that it be denominated Pence Huttonii 



I have already remarked, that it seems to me difficult to characterize 

 the other species of the Whitby lias ; and all the longitudinal sections that 

 I have seen are so similar in their characters, that I can only say of them 

 that they all belong to the genus Pence. Further investigation may elicit 

 specific distinctions, for it is not likely that all the fossil trees of the lias 

 of a whole district should be of two species only. 



FOSSIL TREE FOUND IN THE OOLITIC DEPOSITS OF THE HEBRIDES. 



In Plate XIV. (Figs. 13. and 14.) will be seen representations of two 

 small portions of a transverse section of a fossil plant found in the island 

 of Eig, one of the Inner Hebrides, which was briefly described by me in 

 my " Observations on Fossil Vegetables," and afterwards more fully descri- 

 bed and figured by the authors of the " Fossil Flora," under the name of 

 Pittites eggensis. I shall first advert to the figure and description in the 

 work last mentioned, and then proceed to my own representation of the plant 

 in question. 



In Plate XXX. of the Fossil Flora is represented part of a transverse 

 slice magnified 180 diameters, and including portions of four annual layers. 

 " In structure," it is said to be " obviously different from any of the coal 

 Coniferae ; its medullary rays appear to be more numerous, and frequently 

 are not continued through from one zone of wood to another, but more ge- 

 nerally terminate at the concentric circles ; it abounds in turpentine vessels, 

 or lacunas of various sizes, the sides of which are distinctly defined ; and here 

 and there, rows of flattened tubes are found among the ordinary cylindrical 

 woody tissue. These are distinctly visible in a cross section." 



The fossil in question was found at the base of the magnificent mural 



