43 



PLATE XXI. 



Pecopteris (Cyatheides) oreopteridia. 



Brokg. 



This small fragment of a frond of great size differs 

 in some respects from the typical form of this species, 

 with which, however, it agrees in essential particulars. 

 It w^as found in the Bensham shale, Jarrow Colliery . 



The Plate and drawing (by Peioe) are of the natural 

 size. 



