58 AEAUCAEIOXTLOlf. 



51,724. PI. VI. Kg. 2. 



A radial longitudinal section stowing medullary rays and tte 

 patch of secretory tissue (r) seen in the transverse section repro- 

 duced in Fig. 3, PI. VII. The radial walls of the tracheids hear 

 contiguous rows of hordered pits, as is seen more distinctly in 

 Kg. 5. 



Whithy, Upper Lias. History unknown,. 



51,488. PI. VIL Fig. 5. 



Eadial longitudinal section showing very clearly the characteristic 

 Araucarian form and disposition of the hordered pits. In some of' 

 the medullary rays seen in this section (not shown in the photo- 

 graph) there occur small and simple pits. In one or two places- 

 long and narrow parenchymatous cells occur at the limit of the 

 autumn wood. Bryson Coll. 



51,484. PI. VI. Fig. 4. 



Radial longitudinal section showing the shape and vacuolated 

 contents of the medullary-ray cells. Bryson Coll. 



Other sections : — 51,437. A large transverse section 6-5 X 5 cm.;, 

 the pith, composed of large polygonal cells, is partially preserved, 

 as in 51,484 (PI. VI. Fig. 3). Annual rings well defined and 

 wide, reaching a breadth of 8 mm. MeduUary rays distinct. 



Scarhorough. Bryson Coll. 



51,450. No douht cut from the same specimen as 51,486.- 

 Radial longitudinal section ; preservation poor, but contiguous 

 rows of polygonal pits are seen here and there. 



Whitby, Upper Lias. Bryson Coll. 



51,452. Radial longitudinal section showing clearly marked 

 annual rings. Medullary rays vary in depth from one to twelve or 

 more rows. A row of long and narrow cells occurs in one place 

 next the spring tracheids at the limit of the autumn wood. 



Whitby. Bryson Coll. 



51,473. Transverse section. In all probability specifically 

 identical with the preceding sections. 



Staithes, Upper Lias. Bryson Coll. 



51,486. Tangential longitudinal section. Medullary rays usually 

 one cell broad, but occasionally two cells wide ; the number of cells- 



