232 Proceedings of the Royal Physical Society. 
The only clear evidence of the presence of Conifere which 
I have met with in British Carboniferous rocks (with the 
exception of one or two small seeds of a Gnetopsis, Ren. 
and Zeiller, collected by Mr Hemingway from the Middle 
Coal-Measures of Yorkshire) is that afforded by a small 
specimen of Walchia imbricata, Schimper, which was found 
in the Upper Coal-Measures when sinking the shaft of the 
Hamstead Colliery, Great Barr, near Birmingham." 
These notes on the flora of the Upper Coal-Measures will 
show that the plants of that series were of a very distinctive 
type. 
It may be mentioned here that in France there is a higher 
series of Upper Coal-Measures than any found in Britain, 
where it would appear that rocks on the horizon of our 
Upper Coal-Measures are entirely absent. 
EXPLANATORY NOTES ON THE TABLE OF DISTRIBUTION 
OF SPECIES. 
Although each series of the Coal-Measures is distinctly 
characterised by its own flora, there are many species which 
are common to more than one series, and some even extend 
throughout the whole of the Upper Carboniferous. Of these 
species some are equally common in two of the series, but 
are very seldom, if ever (except in the case of Stigmaria), 
equally common in all. 
The lists given in the table showing the distribution of the 
fossil plants in the Carboniferous rocks of Britain do not 
bring out this relative proportion of the species in the 
different series, but it is represented diagramatically in the 
case of some of the more widely—in time—extending species 
in the following table :— . 
1 Trans. Roy. Soc. Edin., vol. xxxv., part 6, p. 324, fig. 9. 
