23 WATSON, Ttvo Species of Lepidodendron Harconrtii. 



Plate III. 



Fig. 6. Portion of transverse section of L. Hickii represented in 

 Fig. i, shewing two leaf traces and the protoxylem points. 



X(72). 



A 144. D. Watson collection. 



Fig. 7. Portion of the transverse section represented in Fig. i r 

 shewing the beginning of periderm formation in the outer 

 cortex. x (72). 



A 144. D. Watson collection. 



Fig. 8. Portion of transverse section represented in Fig. 1, 

 shewing a leaf trace, with xylem, phloem, and the dark 

 patch of secretory tissue, and the parichnos (shaded) to 

 the outside of it. x (61). 



A 144. D. Watson collection. 



Fig. 9. Portion of a transverse section of a branch of L. Hickii t 

 shewing the exterior of the wood, the badly preserved 

 soft tissue surrounding it, and a leaf trace in the inner 

 cortex. x (72). 



A 171. D. Watson collection. 



Fig. 10. A pair of sieve tubes with their companion cells, from 

 the phloem of L. Hickii. x (324). 



A 170. D. Watson collection. 



Fig. 11. Patch of Aerenchyma filling pit in a leaf base, still in 

 connection with a stem of L. Hickii. 



■ CN. 360/. Williamson collection. 



All the figured sections are from the " Higher Early Banks 

 Mine," at Hough Hill, near Stalybridge, in Cheshire, and are 

 from " coal balls," not from roof nodules. 



