OF LOWER GREENS AND PLANTS. 153 



diameter. In all cases the walls are somewhat thickened and 

 pitted, the pits between the ray and the adjacent tracheids 

 showing very clearly in many cases in transverse view (text- 

 fig. 41, JP.<.). Owing possibly to the petrifaction being slightly 

 imperfect, it is impossible to be certain whether or not the end- 

 walls have typical *' abietinean pitting." That the end-walls 

 are pitted is seen in the tangential view (text-fig. 42, p.e.). 

 In text-fig. 43 the outline and the pitting in relation to the 

 tracheids are all that can be clearly shown. The rays consist of 

 uniform cells, as is shown in text-figs. 42 and 43, and are 

 entirely devoid of ray- tracheids. 



AFFINITIES. The absence of xylem-parenchyma and the 

 pitting of the end-walls of the ray-cells, which can just be seen in 

 some cells of the tangential section (text-fig. 42), prove the type 

 to be a Cedroxylon. The tendency to form partly biseriate rays 

 is found rather more characteristically in Cupressinoxylon than in 

 Cedroxylon, but it is of secondary importance, and is sometimes 

 found in Cedroxylon as, for example, in C. cedroides, Gothan. 



Unfortunately, the preservation of our fossil is such that, 

 though the pits are well seen in the radial walls of the medullary 

 ray-cells, the end and horizontal walls are not well petrified and 

 do not show their pitting. That they had typical " abietinean 

 pitting " when alive seems proved by the few end cell-walls seen 

 in tangential section, in which the characteristic pits occur. 



I do not know any described fossil with which our new 

 species entirely corresponds ; in many respects it comes nearer 

 to Cedroxijlon cedroides (see Gothan, 1907, p. 23) than to any 

 other. Gothan's species, however, has typically larger and 

 much fewer pits than in ours, in which the number of pits per 

 iracheid-tield is particularly high. C. cedroides also has well- 

 developed xylem-parenchyma, which is lacking in our wood. 



There is no British fossil with which one can compare the 

 new species, and I name it after the neighbourhood in which it 

 was found already famous for the number of Aptian fossil 

 plants it has yielded. 



1769. Type-specimen. A portion of secondary wood 11 x6x5 

 cm., and small segments cut from it for sections. 

 The exterior of the splint of wood is nearly free from 

 matrix and is weathered, showing the wood-iibre, and 



