12 Watson, 0)i the Uhdcndroid Scar. 



DESCRIPTION OF PLATES. 



All photographs by the Aiitlior. 



Fig. I. General view of the reverse of the whole Ulodendroid 

 scar. X about \. 

 Middle Coal Measures, Peel, Delph ? 

 In the Manchester Museum. 

 Note the elliptical form and excentric umbilicus. 



Fig. 2. The subject of Fig. i seen from below and slightly from 

 the left. Almost natural size. 

 X the partly petrified wood ring which joins on to X in 



Li' Leaf-trace arising from the wood X. 

 Lt" Leaf-trace further out than IJ' . 



