66 Mr. R. Kidston on British Carboniferous Lycopods. 
Mill, Water of Leith, Midlothian; collected by Mr. James 
Bennie. Wardie, near Granton, Midlothian ; collected by 
Dr. J. M. Macfarlane, F.R.S.E. Little Whickhope Burn, 
near first branch above Cross Sike, Northumberland ; com- 
municated by Mr. H. Miller, F.R.S.E. 
Horizon. Calciferous Sandstone Series. 
In my ‘Catalogue of Palxozoic Plants in the Collection of 
the British Museum’ * I stated the belief that the leaf-scar 
of Cyclostigma, Haughton t, did not differ in any character 
from those of Rhytidodendron, which is now known to be 
synonymous with Bothrodendron. Last year I had the oppor- 
tunity of examining the fine collection of Kiltorkan fossils in 
the Science and Art Museum, Dublin, and in the collection 
of the Geological Survey of Ireland, Dublin, and this has 
confirmed my opinion that Cyclostigma should be merged in 
Bothrodendron. 
The fructification of the Coal-measure Bothrodendra is but 
imperfectly known, and, so far as I am aware, the only cone 
identified with the Coal-measure members of the genus is that 
with short bracts figured in this communication. The cones, 
however, of the Cyclostigma kiltorkense are provided with 
long, linear, lanceolate bracts with a subtriangular base, on 
which the spores are borne. These have been figured by 
Schimper as Lepidostrobus Batlyanus }. Their whole struc- 
ture reminds one much of Sigillarian cones. 
At present so little is known about the fructification of the 
various species of Bothrodendron that on this important point 
a comparison cannot be made between the members of the 
genus ; but so long as the generic characters of these Lyco- 
pods are founded on the structure of the leaf-scar, Cyclo- 
stigma must be enrolled in the older genus Bothrodendron. 
I am aware that the description of the leaf-scar of Cyeclo- 
stigma that I now give differs in some important points from 
that given by Dr. Haughton § and by Heer ||, as also from 
the figures and descriptions given by this last-mentioned 
author in his ‘ Fossile Flora der Biiren Insel;’ but in many 
of the specimens a certain amount of shrinkage appears to 
have taken place which may have reduced the leaf-scars to 
the condition in which many of them occur. Be this as it 
may, the fact remains that when well-preserved examples 
* P. 236. 
t+ Ann. & Mag. Nat. Hist. ser. 3, vol. v. p. 448 (1860). 
} Traité d. paléont. végét. vol. i1. p. 71, pl. 1x1. fig. 9. 
§ ZL. ¢./p. is. 
uart. Journ. Geol. Soc, vol. xxviii. p. 169, pl. iv. 
