45 



PLATE XXII. 



Pecopteris (Alethopteris) serra(?). 



Likdl. and Hutt. 



This elegant fern seems to hold a position midway 

 between the type above named and Pecopteris Serlii 

 (Brong.) The group which embraces these types is a 

 sufficiently distinct one in itself, but the forms compos- 

 ing it are very difficult to separate, since they pass almost 

 imperceptibly from one to the other by very minute gra- 

 dations. In this specimen the number of lobes is much 

 smaller than on the pinnules of the Pecopteris serra figured 

 in the " Fossil Flora," and the lobes are marginally 

 entire. 



The fossil was found in the shale associated with the 

 High Main coal in Felling Colliery. 



The drawing is by Prior, and is, as well as the Plate, 

 of the natural size. 



