544 



Mr. E. A. Newell Arber. On the [Nov. 18, 



Semina incertve sedis — 



Trigonocarpus nazggerathi (Sternb.). 



Lycopodiales — 



Lepidodendron lanceolatum Lesq. ; L. aculeatum Sternb. ; L. wortheni 



Lesq. ; L. dichotomum Sternb. 

 Lepidophloios cf. L. laricinus Sternb. 

 Lepidophyllum majus Brongn. ; L. brevifolium Lesq. 



Sigillaria Icevigata Brongn. ; S. clongata Brongn. ; S. rugosa, Brongn. ; 

 S. trigona Sternb. ; S. tessellata (Sternb.) ; S. brardi Brongn. var. 

 denudata (Goepp). 



COEDAITALES — - 



Cordaites angulosostriatus Grand' Eury. 



The floras of tbe three divisions of the productive measures in the Forest 

 of Dean are compared, and it is found that they are practically identical. 

 All three divisions belong to the palfeobotanical horizon known as the Upper 

 Coal Measures. It is shown that there is a marked agreement between the 

 flora of the Forest of Dean and the Upper Coal Measure floras of other 

 British coalfields, though the following species which occur in the Forest 

 have not previously been recorded from this horizon elsewhere : — 



Annularia gcdioides (L. and H. ). 



Sphenophyllum majus (Bronn). 



Mariopteris latifolia 1 (Brongn.). 



Lepidodendron dichotomum Sternb. 



Sigillaria rugosa Brongn. ; S. trigona Sternb. ; S. brardi Brongn. var. 

 denudata (Gcepp). 



The flora of the Forest of Dean is contrasted with those of the neighbour- 

 ing coalfields. As compared with the Badstock flora, there is found to be 

 a general agreement, though there are important differences in detail, which 

 are more marked than those which exist between the known floras of 

 Badstock and Bristol. These differences, however, do not appear to indicate 

 any considerable disagreement as regards the horizon, for the percentage of 

 Stephanian plants present is approximately the same in each case. They are 

 best explained as local variations in the distribution of the flora of the 

 period. 



The horizon of the so-called Millstone Grits, below the Upper Coal 

 Measures and above the Carboniferous Limestone, is discussed. Eeasons are 

 advanced in support of the view that the Upper Coal Measures of the Forest 

 overlie unconformably the so-called Millstone Grits, which in reality are the 



