53 



PLATE XXVI. 



Pecopteris Silesiaca. 

 Goepp. Var. 



This specimen is nearly akin to the type-form of this 

 species, from which it differs principally in the spacing 

 of the lobes, which is greater than in Goeppert's figure 

 ( <£ Sytema Filicum Fossilium," Plate 27). It is also 

 allied, but more distantly, to Pecopteris oxyphilla of the 

 same author. 



The fern, of which this is a mere fragment, must have 

 been of very large size, since the drawing (by Peior) is 

 one-half the size of nature, whilst the figure in the Plate 

 is one-third smaller than in the drawing. 



N.B. — The words "half natural size" in the Plate 

 apply to the original drawing only. 



The fossil comes from the Bensham shale, Jarrow 

 Colliery. 



