16 THE OLDER MESOZOIO FLORA OF VIRGINIA. 



angular at its bottom, and is shallow. This appears to be the plant named 

 Catamites planicostatus by Professor Rogers. He seems to have noted it 

 only in its condition after the removal of the raised ribs, for these almost 

 never appear, while the flat markings are the most common and obvious 

 features. Professor Rogers mentions seeing in the nodes small circular 

 scars like the insertion of leaves, arranged at intervals of about half an 

 inch. This fossil seems to be the cast of the interior of a plant very differ- 

 ent from the Equisetum Rogersi, for the impressions called Catamites arena- 

 ceus, which are casts of the interior of this fossil, do not show any of the 

 above characteristic features. If it is the cast of the interior of an Equi- 

 setum, it is certainly different from E. Rogersi. 



Formation and locality. — It occurs not uncommonly in the strata under 

 the main coal and above the bottom seam at Clover Hill, along with the 

 casts of E. Rogersi, and also at Carbon Hill and other localities. From the 

 material composing the large sandstone casts above mentioned, whose 

 horizon and locality are not known, it would seem that it occurs also above 

 the horizon of the coal beds. Poorly preserved specimens may readily be' 

 mistaken for E. Rogersi when in the form of casts. 



Schizcneura. spec. 1 

 Plate I, Fig. 3. 



This figure represents the flattened cast of the interior of some stem 

 of which only a portion is preserved. As only one fragment was found, I 

 can say nothing as to the size of the stem, of which the specimen is evi- 

 dently only a small portion. The impression shows parallel, sharply 

 defined, raised lines, which are semi-cylindrical, and narrow very slowly 

 from a width of about half a millimeter in their most remote parts as they 

 approach the nodes, where they are abruptly terminated in a blunt point, 

 abutting against the interval between the adjacent pair of raised lines or 

 ribs on the opposite side of the node. The impression seems to be that of 

 the stem of a Schizoneura. The plant must have been very rare, as I 

 found only one specimen. 



Formation and locality. — Clover Hill, found in the strata accompanying 

 the main seam. 



