35 



PLATE XVII. 



Pecopteris (Alethopteris) marginata. 



GrOEPP. 



This Plate aptly supplements Plate 213 of the " Fossil 

 Flora." In the latter a specimen is represented under 

 the name Pecopteris marginata, the pinnules of which 

 " seem to have been drawn a little together before the 

 plant was fixed in the matrix" (" Fossil Flora," Vol. III., 

 p. 165). In the present case the plant-fragment is pre- 

 served in its natural position, and bears therefore but 

 little resemblance in general form to that previously 

 figured. 



There is no locality attached to this specimen, but the 

 species is recorded from the shale lying immediately 

 above the Bensham seam at Jarrow, whence this example 

 probably came. 



Both drawing (by Prior) and Plate are of natural size. 



