212 DR. D. H. SCOTT : 
two neighbours (Phot. 12). There is a primary xylem-strand corresponding to 
each of the three secondary wedges; the median strand (not well preserved) 
begins further out from the pith than the other two and presumably alone 
represents the leaf-trace (Phot. 13, /.£.). "The structure is comparable to 
that shown in C. americana : see, for example, Pl. 6, Phot. 5. The secondary 
wedge corresponding to the trace is however narrower in C. annularis. 
One of the adjacent strands lies nearly behind the leaf-trace, and may well 
be the reparatory strand from which it has separated (Pl. 7, Phot. 13). 
Unfortunately there are no sections available to show the outward progress 
Text-figure 1. 
Calamopitys annularis (Unger), Solms. 
Transverse section of leaf-trace strand, shown at /.t. in Phot. 18. <°, outer edge of secondary 
wood of stele. The strand shows the ill-preserved primary xylem in the middle, surrounded 
by a broad secondary zone. X about 18. Drawn by Mr. G. T. Gwilliam, Section 98, 
Berlin. (Coll. Solms 411). 
of the trace; the next phase shown (in another specimen) is beyond the 
wood altogether (Phot. 18). 
This is in specimen 98. The stele, measured to the outside of the wood, 
is 28 x 21 mm. in diameter and the pith (including primary xylem) about 
8-9 mm. On one side a portion of cortical tissue is attached, which probably 
formed part of a leaf-base. 
The pith itself is destroyed ; the primary wood is imperfect, but enough 
remains to show that it formed a very nearly continuous zone. Where the 
