180 MESSRS. KJEKBY AND DUFF ON THE 



to Neuropteris heterophylla and one or two other species likewise 

 occur sparingly. 



At E patches of flattened Sigillaria are still met with, but 

 they are associated with Favidaria tessellata, Lepidodendron 

 selaginoides, Catamites approximatus, Antholites Pitcairnia, Neu- 

 ropteris heterophylla, N. gigantea, Sphenopteris Honinghausi, 

 Pecopteris laciniata, and other ferns. 



At F there are many ferns, such as Pecopteris laciniata, Ale- 

 thopteris lonchitidis, Neuropteris heterophylla, along with Cat. 

 approximatus, Lep. selaginoides, and Lep. elegans. 



While at G Sigillaria occurs again in upright stems with a 

 few ferns. 



At H there is a great profusion of fossils with a predominance 

 of ferns. Among them are — Alethopteris lonchitidis, A. Serlii, 

 Pecopteris laciniata, P. adiantoides, P. oreopteroides {?) Neurop- 

 teris attenuata, N. acuminata, N. caudata, N. gigantea, N. hete- 

 rophylla, Sphenopteris dilatata, S. excelsa, and Cyclopteris oblata; 

 also Antholithes Pitcairnia, Walchia piniformis, Volhnannia 

 polystachia, Favularia nodosa, Ulodendron major, Megaphyton 

 distans, Lepidodendron elegans, L. selaginoides, Sigillaria renifor- 

 mis, &c. The roof, which is grey shale, is often literally covered 

 with the fronds of ferns, sometimes of one species and sometimes 

 of another, and also in such perfection as almost to preclude the 

 idea of their having been subjected to much drifting before de- 

 position. 



If the list of species be taken there is little to mark it as dis- 

 tinctive from lists already published from the mid and upper 

 strata of the Durham Coal Measures. A few species have not 

 been recorded from Durham before, but the bulk of them are al- 

 ready well known from the horizons of the Low Main, Bensham, 

 and High Main seams of the Tyne and the Wear. 



These are the results of our examination, which would un- 

 doubtedly have been more satisfactory had the field of our 

 observation been wider and more exhaustively investigated. 

 Taking them however as they are, they scarcely appear to sup- 

 port the views of Geinitz, for they show anything but uniformity 

 of fossil distribution on the horizons of the Brockwell and Five 



