DESCRIPTIVE CATALOGUE 



is very irregularly broken out from the trunk and 

 teredo-bored to some extent. The exterior is weathered 

 to a whitish-grey colour, but the inner zones of the 

 wood appear quite black when cut across, and a rich 

 brown in transparent section. 



1769 a. Figured, PI. XIF, fig. 1 ; and text-fig. 41. Transverse 

 section from the above, showing a large number of 

 very well preserved annual rings, as described in the 

 account of the species, atit<'. 



1769 b. Figured, text-fig. 42. Tangential longitudinal section 

 of the same, partly very well preserved, and showing 

 not only the height and si/.e of the medullary rays, 

 but also, in a few cases, the pitting in the end-walls, 

 as is illustrated in text-fig. 41*. 



1769 c. Figured, PI. XII, fig. 2; and text-fig. 43. 



longitudinal section of the above, showing the pittings 

 in the trachcid-walls and in the medullary rays. The 

 small round pits in the radial walls of the medullary 

 rays can be seen in numerous places. In many of the 

 tracheids also the rims of Sanio are quite apparent. 



Kentish Rag, Lower Creonsand ; Iguanodon Quarry, Maidstone. 



Presented by W. 11. Bensted, Esq., 18oU. 



Cedroxylon pottoniense, sp. nov. 

 [Text-fig. 44.] 



Ihar/nosis. Incomplete, owing to the unsatisfactory preserva- 

 tion of the specimen. The species founded on a twig originally 

 about 3-5 cm. in diameter. Coniferous wood with well-marked 

 annual rings, tracheids in regular series, somewhat rounded, up 

 to about 30-40 p in diameter. Wood-parenchyma fairly plenti- 

 ful, particularly in summer wood, Kesin-canals absent. 

 Medullary rays principally 4-15 tracheids distant, uniseriate, 

 and low. Walls of ray-cells much thickened, and showing very 

 typically the " abietiuean pitting " both in horizontal and end 

 walls. 



HORIZON. Lower Greensand [not derived ?]. 



LOCALITY. Potton. 



