DESCRIPTION OF SPECIES. 89 



midrib is large and sometimes leaves an impression on the shale of the 

 depressed line on each side of it, which being seen in relief, looks as if the 

 leaf had two nerves. I have found only two very small fragments repre- 

 senting the terminal portion of two small branches. They were found in 

 the Cumberland area. Professor Rogers states that he found different parts 

 of the plant, and among them, the cone, but does not give the locality and 

 horizon. I give in Plate XLVII, Fig. 6, a copy of his figure of the plant 

 as presented in the article on the "Age of the Coal Rocks of Eastern Vir- 

 ginia," before referred to. He says of the plant that it strongly resembles 

 Lycopodites Williamsoni, Brongt., which is Phillips's Lycopodites uncifolius, 

 from the Yorkshire Oolite He says, "The one, sometimes two, strongly 

 marked ridges up the center of each leaf, the oppositely placed leaves with 

 the smaller ones between, the scales upon the stems, the cones with the 

 strongly marked rhomboidal, spaces like scars, and the peculiar claw-like 

 form of the leaf, especially when full grown, are all distinctly exhibited in 

 the Virginia fossil." 



The parts of the plant that I have seen, and the figure of Professor 

 Rogers, while indicating a plant something like the Yorkshire one, belong 

 to really quite a different fossil, and one which is much more slender, and does 

 not have the thick tetragonal leaves of the Yorkshire plant, which is -a Pachy- 

 phyllum. The leaves of the Virginia fossil, though thick, are by no means 

 so much so as the Pachyphyllum {Lycopodites) Williamsoni. They are flat, 

 and marked by a well-defined midrib. Dr. Emmons gives ("Am. Geol.," fig. 

 75), a representation of a fossil which is clearly allied to the Virginia plant. 

 Emmons calls this plant Walchia gracile. The plant he gives in fig. 76, as 

 Walchia variabilis is probably a Pachyphyllum. He says nothing about 

 the presence of a midrib, but one seems to be indicated in the figure. 

 Emmons's fig. 74, of Walchia brevifolia is no doubt a Cheirolepis. Dr. New- 

 berry, in Macomb's Report, plate iv, fig. 4, plate v, fig. 4, and plate vi, fig. 

 9, gives representations of twigs of conifers which appear to belong to this 

 species. 



Formation and locality. — Found by me only in the Cumberland Area, on 

 the horizon of the coal beds of that area. 



