PLATE 11, 12, 13, 13*, 14-. 
seen ; leafy, covered with scales. Leaves crouded (seem* 
ingly one from each scale) subulate, marked, with a strong 
rib. Scales rhomboidal, sharp-pointed, slightly carinated or 
keeled, close, imbricate, covering each other in such a 
manner, that the whole surface of the stem appears regu- 
larly divided into rhombs. 
Not uncommon in shale and ironstone, near Chesterfield. 
Impressions of it frequent in the coal at Thatch-marsh, near 
Buxton. 
The original of this petrifaction doubtless one of the 
fir tribe. 
Fig. 4. A specimen in ironstone. The stem com- 
pressed ; covered with a white, chalky, friable, calcareous 
substance, common in the cavities of nodular iron ores. 
5. In ironstone. The fragment a. appears to be the top 
of a specimen larger than the foregoing. It is not com- 
pressed, but rises considerably above the broken surface of 
the nodule— another specimen. The leaves only visible. 
I have met with very perfect specimens of this fossil in 
gritstone, in Lancashire. One of these (Plate 50) will con- 
vey a better idea of the form and disposition of the scales 
than any I have collected in this county. 
6 
