OF LOWER GREEXSAND PLANTS. 223 



up better than the rest of the tissues, and in it the 

 spiral and fine scalariform elements can be clearly 

 recognised. 



V. 5455 b. Radial longitudinal section of above. Very little of 

 the tissue is well preserved. The resin-parenchyma 

 can be recognised, however, and here and there the 

 round, isolated, bordered pits in the tracheids and 

 the medullary rays. The observable details agree 

 entirely with the radial section seen in text-fig. 61. 



V. 5455 c, d. Tangential longitudinal sections of the above 



In d the outgoing leaf-trace can be well seen. 

 Lower Greens and ; "Woburn Sands. 



Transferred from tlie Botanical Dept. 



V. 5447. An irregular wedge of secondary wood, measuring 

 3x2x6 cm., doubtfully referable to P. woburnense. 

 In longitudinal sections, nothing can be made out 

 except the fact that the tracheid-pits are large, round, 

 and isolated. The transverse section, however, agrees 

 very closely with the type. Externally it shows the 

 woody texture, and is petrified in a whitish silicified 

 medium, locally iron-stained. 



V. 5447 a. Transverse section of the above, in general very 

 poorly preserved, but locally, where it is iron-stained, 

 the tissue is clearly seen. The medullary rays are 

 conspicuous, and interspersed among the large 

 tracheids are numerous resin-containing xylem- 

 parenchyma cells (cf. text-fig. GO). 



V. 5447 b, c. Longitudinal sections, both extremely poorly 



preserved. 

 Lower Grcensand ; Woburn Sands. 



Transferred from the Botanical Dept. 



Podocarpoxylon bedfordense, sp. nov. 

 [Plate XXI ; text-fig. 64.] 



Diagnosis. Podocarpoid wood with well-marked growth-rings, 

 but with a very narrow zone of autumn wood. Species founded 

 on an axis not less than S cm. in diameter, and perhaps more. 



