FOSSIL PLANTS. 443 



distant, with more or less undulated or pinnately round-lobed 

 margins; medial nerve flat and smooth. The epidermis of the 

 leaflets is thick, smooth, and the veinlets obsolete — appear 

 generally as marked fig. 1 a. Fig. 2 a represents the only 

 leaflet where I could distinctly see the veins. They are pin- 

 nately branching from the medial nerve, arched oblique, fork- 

 ing once below the middle. Found at Murphysboro, in small 

 specimens. Lower Coal Measures. 



Pecopteris Newberry i, Lsqx. Splienopteris Newberry i, Lsqx., 

 Oeol. Report of Penn., p. 862, tab. 9, fig. 4. Locality: Mazon 

 creek. Small specimen. Coal No. 3. 



Pecopteris Murrayana ? Brgt. Hist, des Veg. Foss., 1, p. 358, 

 tab. 26, fig. 1 to 5. A small specimen from Mazon creek, and 

 a large one from Newport, R. I., have all the characters of this 

 species of the Oolite of Europe. M. Brongniart already re- 

 marks, in his examination of this species, that one species 

 apparently identical with it is found in the Coal Measures of 

 France. A small specimen also from Mazon creek, is referable 

 by the form of the leaflets to Pecopteris cheer ophylloides, Brgt., 

 Hist, des Veg. Foss., 1, p. 357, tab. 125, fig. 1 and 2, but the 

 nervation is indistinct. 



SECOND DIVISION.— LEAVES OF UNCERTAIN OR UNKNOWN AFFINITIES. 



Genus Cordaites, Ung. Stem erect, ringed by the persist- 

 ent base of the leaves ; leaves simple, half embracing the stem, 

 long, linear, sometimes obovate, one to two inches broad; veins 

 thin, parallel, equal or rarely forking. 



Cordaites borassifolia, Ung. Abounds in the roof shales of 

 the coal strata, presenting various forms which probably belong 

 to different species. The long, narrow, entire leaves resemble 

 those of some Palms. Some of the numerous rootlets found 

 in the Coal Measures have been referred to this genus by hy- 



