VOL. XVII. (3) FOSSIL PLANTS— FOREST OF DEAN 331 



Transactions of the Royal Society of London, Ser. B, Vol. 

 202., p. 231, 1912. Photographs of many typical Upper Coal 

 Measures plants are also given in my little sixpenny " Fossil 

 Plants " (Gowans and Gray's Nature Books, No. 21, 1909). A 

 discussion on the many problems which remain unsolved in 

 connection with the subject of Coal, will be found in my 

 " Natural History of Coal," one of the shilling Cambridge 

 Manuals of Science and Literature, 1911. 



I wish here to add my thanks to the owners and managers 

 of the various collieries in the Forest for the facilities which 

 they have always given me, in the kindest way, for collecting 

 fossil plants at their collieries. I am particularly indebted to 

 Mr Frank Brain of Trafalgar, Mr C. Cooke of the Princess 

 Royal Collieries, and I would gratefully acknowledge the help 

 and influence of Mr T. A. Llewellyn of the Crown Office, which 

 has always been most willingly placed at my disposal. I would 

 also add that part of the cost of collecting the flora has been 

 defrayed by means of grants from the Government Grant 

 Committee of the Royal Society. 



EXPLANATION OF THE PLATES 



{All the specimens figured are in the Carboniferous Plant Col- 

 lections of the Sedgwick Museum, Cambridge, to which the 

 numbers refer. The negatives are by the author, the prints 

 by the author and Mr Tarns, of Cambridge). 



PLATE XXXVn. 



Fig. I. Mariopteris muricata (Schloth.), from the Second Divi- 

 sion, at Crump Meadow Colliery. No. 1782. 

 Slightly reduced. 



Fig. 2. Pecopteris Miltoni (Artis), from the First Division, 

 Woorgreens Coal, Woorgreens Colliery. No. 1801. 

 Slightly reduced. 



Fig. 3. Pecopteris polymorpha, Brongn., from the First Divi- 

 sion, Woorgreens Coal, Woorgreens Colliery. No. 

 1958- — X i. 



Fig. 4. Alethopteris Grandini (Brongn.), from the Third Divi- 

 sion, Yorkley Coal, at Park Gutter Colliery, No. 

 1598. — X f. 



