AEAUCAEIOXTLOsr. 59- 



in a ray varies from one to twenty. Probably a section of 

 Araucarioxylon Lindhii. 



WMtby, Upper Lias. Bryson Coll. 



51.489. Transverse section. 



Wiitby, Upper Lias. Bryson Coll. 



51.490. Kadial longitudinal section; preservation very good. 

 The pits are particularly well shown, usually occurring in two or 

 three contiguous rows, but occasionally in four rows. Pits shown 

 on the walls of some of the medullary -ray cells. 



Whitby. Bryson Coll. 



51,697. Tangential longitudinal section, probably from the same 

 specimen as 51,486. 



51,703. Badly preserved transverse section, probably Araucari- 

 oxylon Lindleii. 



Upper Lias. Bryson Coll. 



Araucarioxylon Lindleii (P). 



51,449. PL VII. Eig. 2. 



Transverse section characterised by the great breadth, if not by 

 the absence, of annual rings. The tissue is crushed in places, 

 hence the difficulty of stating definitely that rings of growth do 

 not occur. Medullary rays comparatively broad and well marked. 

 This wood bears a close resemblance to that which is associated 

 with some of the specimens of jet described below. 



"Whitby, Upper Lias. Bryson Coll- 



51,487. A transverse section, no doubt identical with 51,449 

 (PL VII. Eig. 2). No rings visible. 



Whitby. Bryson Coll. 



51.491. Oblique tangential section, showing traces of contiguous 

 and polygonal pits on some of the tracheids. 



Whitby. Bryson Coll. 



51,494. A crushed transverse section. 



Fear Whitby. Bryson Coll. 



51,647. Badly preserved transverse section. 



Staithes, Upper Lias. Bryson Coll. 



51,728. Eadial longitudinal section. 



Whitby. Bryson Coll. 



