56 ABAUCAEIOXYION. 



Araucarioxylon Lindleii (Witham). 



[Internal Struct. Foas. Veg. p. 58, pi. ix. figs. 1-5 ; pi. xv. figs. 1-3.] 



(Plate VI. ; PL VII. Figs. 2, 3, 5.) 



' 1833. Feme Lindleiana, "Witham, Int. Struct. Fob?. Veg. p. 58, pi. ii. 

 figs. 1-5 ; pi. XV. figs. 1-3. 



1845. P. Lindleyana, Unger, Synopsis, p. 207. 



1847. P. Lindleyana, linger, Chlor. protog. p. 35. 

 ' 1848. P. Lindleyana, Bronn, Ind. Pal. p. 951. 



1849. P. Lindleyana, Brongniart, Tableau, p. 106. 



1850. P. Lindleyana, TJnger, Gen. spec. foss. p. 370. 

 Finites Lindleyamis, Goppert, Foss. Conif. p. 217. 



1854. Fence Lindleyana, Morris, Brit. Foss. p. 17. 

 1866. Finites Lindleyanus, Carruthers, Geol. Mag. vol. iii. p. 545. 

 1876. Feuce Lindleyana, Tate & Blake, Lias, pp. 233, 474. 

 1882. P. Lindleyana, Etheridge, Quart. Joum. Geol. Soc. vol. xxxviii., Proc. 

 p. 140. 



Annual rings distinct. "Wood tomogeneous, composed of traclieids 

 learing 1-3 rows of bordered pits on their radial walls ; the pits 

 usually occur in two contiguous rows, alternately disposed . and 

 polygonal in shape ; occasionally three rows of pits occur, and some 

 of the tracheids possess a single row (PL VII. Fig. 5). Medullary 

 rays distinct in transverse section of the wood, composed of narrow, 

 radially elongated cells, with single pits in their walls ; the rays 

 vary in depth from a single row to more than twelve rows of 

 parenchymatous cells. In a tangential section of the wood the 

 rays occur as long and narrow groups one cell in breadth ; 

 occasionally a ray is seen to be two cells in breadth. Pith 

 composed of comparatively large polygonal cells, passing into 

 a fairly distinct perimedullary zone of smaller and darker cells 

 (PL VI. Fig. 3). 



51,484. PL VI. Figs. 1, 3, and 4 ; PL VII. Fig. 3. 



A large transverse section, 8'5 X 5'5 cm., cut from the same 

 piece of wood as that which afforded the section figured by 

 "Witham in his pi. ix. fig. 1. The pith, which is imperfectly 

 preserved and occupies an excentric position, consists mainly of 

 fairly large polygonal cells (PL VI. Fig. 3), passing into a peri- 

 medullary zone of smaller cells. Groups of darker elements iu 

 the pith region may represent sclerous nests, but the preservation 

 is not sufficiently good to enable one to distiuguish between dark 

 ceU-contents and thickened membranes. 



