30 PENHALLOW ON DEVONIAN PLANTS. 



Description of Figures. 

 Plate I. 



Fig. l.—Nematophijlon Logani— Transverse section, showing conversion of the normal into a pseudo-cellular 

 structure through cry.stallization. Tal;en from a specimen also showing normal structure. ;< 154. 



Fig. %—Nemattrphyton crassum ( f ).— Transverse section showing effects of crystallization, x 154. 



Fig. 3. — Nemalophylon cragsum (?). — Longitudinal section showing tendency of false cells to follow lines of normal 

 structure, x 154. 



Fig. 4.—Neynalophyton ioi/am'.— Longitudinal section of normal structure showing the secondary filaments crossing 

 ' the cells of the medulla, x 154. 



Figs. 5 & 6.— Transverse and longitudinal sections of Nemalophylon crassum. Normal, x 154. 



Plate II. 



Fig. i.— Nemalophylon Hîcim.— Showing siliceous casts with carbonaceous fragments adherent to them, x 210. 

 Fig. 1— Nemalophylon «cnuc— Longitudinal section, showing general character of the structure. One of tlie large 

 tubular openings is seen in the centre, x 300. 



