104 Proceedings of the Royal Physical Society. 
For the privilege of examining the specimens which formed 
the subject of these remarks by Messrs Jack, Etheridge, 
and Carruthers, just quoted, I am indebted to Sir Archibald 
Geikie. The conclusions to which I have come, after a 
careful examination of the fossils, is, that the original 
suggestion of Messrs Jack and Etheridge, that the affinity of 
the fossils was with Arthrostigma, is the correct view of their 
relationship ; and if Sir William Dawson has been correct in 
referring to Arthrostigma the curious little fructification 
which he associates with his Arthrostigma gracile, the plants 
are very distinct from Pslophyton, and I do not see any 
reason for rejecting Dawson’s views in regard to the fructifica- 
tion of his Arthrostigma gracile. The fossils probably belong 
to the Lycopodiacew, but I am not aware on what grounds 
Mr Carruthers states that they have a “ true Lepidodendroid 
structure,’ and taking into consideration the differences in 
the fructification of Psilophyton and Arthrostigma, how they 
can possibly be regarded as “the same thing.” 
It is possible that the plants placed by Dawson in Cyelo- 
stigma may be fragments of his Arthrostigma, but Haughton’s 
genus Cyelostigma is a very different plant, and’ perhaps not 
generally distinct from Lothrodendron. 
But before further discussing the identity of the Brae- 
andam specimens, it may be well to consider the generic 
characters of Dawson’s genus Arthrostigma. 
ARTHROSTIGMA, Dawson, 1871. 
Geological Survey of Canada—Fossil Plants of Devonian and Upper 
Silurian Formations of Canada, p. 41. 
“Stems elongated, cylindrical, bifurcating, and giving off 
lateral branches; irregularly furrowed or ribbed longitudin- 
ally, with circular leaf-scars arranged in whorls, and bearing 
linear rigid leaves with circular bases. Structure apparently 
cellular, with a slender vascular axis ; fructification probably 
in cylindrical strobiles.” 
In the second part of the “ Fossil Plants of the Erian 
(Devonian) and Upper Silurian Formations of Canada,” 
