PLATE XIX. 



Si(/iUaria vascularis, Biniiey. 



Fig. 1 (No. 39). Transverse section of a stem from the " Hard Bed " of Coal at 

 North Owram, Yorkshire, showing the pith, internal radiating cylinder, lax cellular 

 tissue, external radiating cylinder, and outer bark. The wedge-shaped spaces of a light 

 colour indicate the lax cellular tissue enveloping the foliar bundles communicating with 

 the leaves. Natural size. 



Fig. 2. External view of the same specimen, partly decorticated^ showing the irre- 

 gular ribs and furrows. Natural size. 



