114 THE OLDER MESOZOIC FLORA OF VIRGINIA. 



Pterozamites linearis. 



Plate LIV, Fig. 2. 

 Emmons's "Am. Geol.," p. 120, fig. 87. 



"Frond linear and narrow; leaflets very narrow and delicate; midrib slender. 

 It occurs in the soft drab-colored slate at House's Quarry, Haw River." 



This plant is clearly a Ctenophyllurn. It is possible that it may be a 

 small form of the very variable Ctenophylluni Braunianum, but it seems to be 

 a new species. It might be called Ctenophyllurn lineare. 



Pterozamites spatulatus. 



Plate LIII, Fig. 6. 

 Emmons's "Am. Geol.," p. 120, fig. 88. 



" Midrib delicate, punctate or transversely striate, leaflets long, spatulate, or nar- 

 rowing towards the base, but attached by their whole width. The termination of the 

 leaflets is rounded, and they are widest near the middle or a little beyond it. It 

 occurs at House's Quarry, on the Haw River." 



The only plant known to me with which this may be compared is the 

 Pterophyllum Andrceanum, Schimper, Pterophyllum longifolium, Andrae, from 

 the Lias of Steierdorf, Banat. But this latter plant has wider leaflets that 

 are joined at the base. Still, Andrae's figure 1, plate x, of the "Foss. Flor. 

 Sieb. und des Banates," shows that some of the leaflets of the Steierdorf 

 plant are not wider than those of the North Carolina species. The Steier- 

 dorf fossil in this irregularity of the width of the leaflets on the same 

 midrib resembles the Virginia Pterophyllum incequale. The Steierdorf plant 

 has the same narrowing of the* leaflets towards the lower part that we find 

 in the North Carolina plant. Taking these three forms together, viz., 

 Pterophyllum Andrceanum, P. incequale, and the present plant, P. spatulatum, 

 we have a complete transition from one form to the other, and, assuming 

 that the North Carolina and Virginia fossils form the extremes, the Steier- 

 dorf plant is the intermediate form. The plant in question is clearly a 

 Pterophyllum, and may be called P. spatulatum. 



Diouites linearis (Zamites graminoides). 

 Plate XUX, Fig. 6. 

 Emmons's "Am. Geol.," p. 121, plate 4, fig. 11. 



"Frond narrow, pinnate, elongate; midrib slender, striate; leaves long, narrow 

 grass-like, tapering from near the middle to a point, and forming an acute angle with 



