FROM THE LOWER COAL-MEASURES. 65 
The photographic illustrations to this paper are by my colleague, Mr. L. A. 
Boodle, F.L.S., to whom I am much indebted for the trouble he has taken to obtain the 
best possible results. The drawings for the figures in Plate 10 are from the skilful 
hand of Mr. John Allen, of Kew. 
ADDENDUM. 
Since the paper was sent in to the Society I have seen a number of additional sections, 
cut by Mr. Lomax, from the two ends of the original specimen, and therefore beyond 
the limits of the series on which my observations have been based. From the upper 
end, above transverse Section XVII., no less than eleven additional sections * have been 
cut, forming an important extension of the transverse series. Unfortunately I have 
still been unable to find any decisive evidence of the giving off of a petiole from the 
stem. "The large leaf-base, lying between d.r. and d.r. (Pl. 8. fig. 6) disappears, it is 
true, but its disappearance is due to decay. It is therefore impossible to tell whether a 
real separation took place within this region. No other leaf-base becomes free. 
As regards the course of the meristeles, the division of the meristele g, indicated in 
Section XVII. (fig. 6), is completed, and the outer portion at once divides into two. 
No further change could be detected. The meristele B gives off yet another bundle 
from the right-hand end (fig. 6). "The new sections confirm the opinion expressed on 
p. 52, that the small meristele 9' does not really undergo fusion with the stele, but has 
merely been mechanically forced into its tissue. The same thing has happened to a 
small Goniatite shell close by. 
From the lower end of the specimen, below Section I. of our series, two further 
transverse sections (W I. and W II.) have been cut. They agree with Mr. Watson's 
section (No. I.) except in one point, which, however, is important. The meristele on the 
right, lying next above y (see fig. 1), is undivided in Section I.; in the first of the new 
sections, W L, it shows signs of splitting into two; and in the lowest section, W II., it 
has divided into two nearly equal parts. As the division is found on tracing the 
meristele downwards, the case is evidently really one of fusion in the upward direction, 
and thus affords an interesting parallel to the fusion of the meristeles 6 and y deseribed 
in the text. The occurrence of these fusions is evidently characteristic of the meristeles 
in Sutclifia. Fight additional longitudinal sections have been cut from the lower 
extremity of the specimen. The various tissues are well shown, but there are no new 
features to be recorded. 
It will thus be seen that the new sections confirm, but in no way modify, the conclu- - 
sions arrived at from the examination of the original series. a 
May 7, 1906. D. H. Scorr. 
* These sections are lettered in order, from below upwards, from À1teJ. 
