OF LOWER G11EENSA.X1) PL.VNTS. 267 



V. 13231 d. Figured, PI. XXVII, figs. 1& 2; PI. XXV III, fig. 1. 

 lladial section similar to the above, showing the pits 

 in the walls of the rays in all directions and the 

 pitted areas in the radial walls. Numerous tyloses 

 can be seen blocking the vessels. In many places 

 the scalariform bars and the oval bordered pits of 

 the vessels can be seen, also the isolated round 

 bordered pits of the wood-fibres. 



V. 13231 e. Longitudinal section, partly tangential and partly 

 radial oblique, in which many individual cells are well 

 preserved. 



V. 13231 f. Figured, text-fig. 78. Tangential longitudinal 

 section, partly rather oblique. Where it is truly tan- 

 gential the uniseriate nature of the medullary rays 

 and their thickened walls can be seen. 

 Folkestone Beds, Lower Greensand ; near Ightham, Kent. 



Presented by the Committee of the 

 Corporation Museum, Maidstone, 1915. 



Family DIPTEROCARPACB^B (?). 



Genus WOBURNIA, Stopes. 



[Phil. Trans. Hoy. Soc. Lond., ser. B, vol. 203, 

 p. 91 etseq., 1912.] 



As one species only of this genus is known the species and 

 genus are not separately diagnosed (see p. 283). 



Woburnia porosa, Stopes. 

 [Text-figs. 79-81.] 



1912. Woburnia porosa, Stopes, Phil. Trans. Roy. Soc. Lond., 

 ser. B, vol. 203, pp. 91-93, pi. vii, fig. 7 ; pi. viii, fig. 8j text- 

 fig-. 6. 



Diagnosis. The species is founded on a wedge of decorticated 

 secondary wood, from a branch or trunk of unknown size. 

 Secondary wood with exceedingly numerous and very large 

 vessels. Vessels approximately round, placed singly, averaging 

 about 350 n in diameter. Hays mostly mulfciseriate, averaging 



