PLATE XXXI. 



Coli/mbetes Edivardst, gen. et sp. nov. Sections of portion 

 of trunk. Lower Greenland ; perhaps from Leightoii Buzzard. 



l ? ig. 1. Transverse section, showing the pith and surrounding 

 scattered xylem-zone. p., pith-cells ; #., isolated 

 groups and clusters of tracheids : ., series of tracheids, 

 widely separated by large quantities of ground-tissue. 

 No. V. 6127 e (p. 314). 



Fig. 2. Tangential longitudinal section of an outer zone of 

 secondary wood, showing the large quantity of medul- 

 lary rays, m., with the narrow curving tracheids 

 between them. At t. the tracheids may be seen to 

 loop and branch. No. V. 6127 n (p. 326). 



