98 THE OLDEE MESOZOIC FLOEA OF VIRGINIA. 



This bituminous shale group comes some distance above the base of 

 the North Carolina Mesozoic series of strata, and, as stated, most probably 

 stands on the horizon of the strata yielding most of the Virginia plants. It 

 seems to be very poor in fossils. No determinable plants have been found 

 under this group. The following is Emmons's description of the above- 

 named plants. The plates first given in these descriptions refer to the 

 plates of this work containing the plant in question. Figures given in 

 Emmons's quoted descriptions are those of his work. The first and second 

 of these plants are in Eminons's text referred to plate 2, but are really 

 found on plate 6. 



Equisetum Columnaroides. 



Plate XLIX, Fig. 3. 



Emmons's "Am. Geol.", plate vi, fig 3, p. 35. 



"Cuticular surface very reticulate; articulations indistinct; ribs of the stein of 

 two kinds, the ligulate aud tapering; the latter terminate in a point, and are grooved 

 in the middle. It belongs to the bituminous slate, near the top, and was found within 

 the gray sandstone, beneath the main coal seam, and in the bituminous slates above." 



I do not find plate 2, in the work of Emmons. In the description given 

 above the reference is to plate 2, fig. 3, of the "Am. Geol." I find, however, 

 on plate 6, fig. 3, the form depicted on Plate XLIX, Fig. 3, of this work 

 and this may be the plant in question. It seems to be the same with the 

 rhizome of Equisetum Mogersi, given on Plate I, Fig. 2, and found at Clo- 

 ver Hill. 



Calamites punctatus. 

 Plate XLIX, Fig. 4. 

 Emmons's "Am. Geol.", plate vi, fig. 5, p. 35. 



Emmons says of this : 



" Stem finely striate ; punctures, or bars, between all the striae, sometimes on the 

 striae. The transverse bars, under a good glass, are much like dots, and do not always 

 connect the longitudinal Hues." 



This plant is referred to plate 2, fig. 5, but I find it on plate 6, fig. 5. 

 Its locality is not given. It is clearly a fragment of a leaf of Splienozamites 



Bogersianus. 



