PLATE XXIL 



Sigittaria vascularis, Binney. 



Fig. 1 (No. 44). A transverse section of a specimen from the "Bullion Seam" of 

 Coal, near Burnley, showing the pith, internal radiating cylinder, cellular tissue, and 

 external radiating cylinder with bell-shaped orifices. Natural size. 



Fig. 2. Pith and internal radiating cylinder as seen by reflected light. Magnified 

 6 diameters. 



Fig. 3. Transverse section of a part of the outside of the internal radiating cylinder, 

 showing vascular bundles and spaces where medullary rays may have passed. Magnified 

 15 diameters. 



Fig. 4. Tangential section of the internal radiating cylinder, showing a vascular 

 bundle and medullary rays. Magnified 12 diameters. 



