PLATE IX. 



Pityoxylon Woodwardi, sp. iiov. Radial sections of wood. 

 Lower Greensand ; Woburn, Bedfordshire. 



Fig. 1. Radial section showing pitting of tracheids. ., ele- 

 ments with large, round, isolated pits ; >., " twin-pits " 

 in a similar element. No. V. t5429 b (p. 116). 



Fig. 2. Radial section showing pitting of tracheids. ., as 

 above ; c., pits in adjacent pairs. No. V. 5429 b 

 (p. 117). 



Fig. 3. Radial section showing the medullary ray, with hori- 

 zontally running black bands formed by contents- 

 containing cells, p.m., pitted cells in which the large 

 definite oval pits are well seen, each surrounded by a 

 very faint border. No. V. 542.0 b (p. 1 li ). 



