FOSSIL PLANTS. 431 



narrow, flattened or recurved margin ; nervation obsolete ; 

 veins distant and apparently forking once only. The scarcely 

 visible veins are more distant than in the former species. The 

 surface of the leaves is traversed crosswise by irregular wrin- 

 kles or fissures through the thick epidermis. The convex, 

 narrowly-margined or flattened leaflets look as if their under 

 surface was thickly covered with spores, though no trace of 

 them can be seen marked by compression upon the upper sur- 

 face. Locality: Mazon creek. Coal No. 3. 



Neuropteris inflata, Sp. nov. PL 37, fig. 2. Apparently 

 bipinnately divided. Leaflets large, nearly round or broad 

 oval, rounded at the base, lanceolate above, attached to the 

 rachis by a broad base, inflated or convex on the upper surface. 

 Nerves flabellate, dichotomous or forking in ascending, arched, 

 distinct, —thin, resembling those of Neuropteris hirsuta, but 

 better marked and inflated near the base. The specimen fig- 

 ured is also from Mazon creek. It shows two opposite leaflets 

 attached to a narrow, irregularly striated rachis, which is appa- 

 rently connected with a broader main stem, about half an inch 

 thick. Another specimen from the same locality represents 

 the upper part of a pinna, with a number of leaflets, each 

 attached to the rachis by a broad base and diversely folded and 

 superposed. On one side of the branches the leaves are round, 

 like those of our figure, while on the other they are longer, 

 oval-lanceolate, somewhat pointed, resembling the large form 

 of Neuropteris hirsuta, but shorter and with a convex surface. 

 From these specimens, and also from two fine ones preserved in 

 the Cabinet of Princeton College, New Jersey, the upper sur- 

 face of this species appears always convex or inflated. 



Neuropteris verbencefolia, Sp. nov. PI. 37, fig. 1. This re- 

 markable species is known only by a single specimen from 

 Mazon creek. It is a single leaflet, oval-lanceolate in outline, 

 obtuse at the top, taper-pointed towards the apparently petioled 

 base. The margin is regularly and deeply serrate. The veins 



