Portion, at 225 cm from the base, in which, on the right, the 

 impression retains partial casts of the leaf trace sheaths pass- 

 ing very obliquely upward and outward, the stage of preserva- 

 tion over a part of the area being that known as Knorria. 

 The costation is narrowed and exaggerated over the median 

 line of the trunk, while in the upper left the cushions present 

 the fusiform (lepidodendroid) type in distinctly spiral 

 arrangement. 



Cortical impression, at 275 cm from the base, in which the 

 partially macerated tissue permits the expression of the 

 obliquely emergent nerve trace sheaths. 



Marginal area, at 280 cm from the base, showing the elongated 

 form of lepidodendroid leaf cushion. Along the left border 

 several leaves (L) are seen still attached to the bolsters. 

 Figure 3 is inverted. 



Slightly enlarged detail of leaf cushion from nearly mid-length 

 of the trunk, showing the obovate leaf scar, the ligular pit 

 just above it, and the nerve trace above the center of the scar. 



Portion, enlarged, of rib showing leaf cushion, leaf scar and the 

 greatly elongated parichnoian cicatricules which are usually 

 slightly in-hooked at the top and w T hich tend to meet in the 

 lower part of the leaf scar so as to form a horseshoe-shaped 

 cicatricule nearly embracing the nerve trace. 



Enlarged and semidiagrammatic detail of the leaf still attached 

 to the cushion. 



