308 THE POTOMAC OR YOUNGER MESOZOIC FLORA. 



QUEECOPHYLLUM TENUINERVE, sp. 110 V. 

 Plate CXLIX, Figs. 6, 7. 



Leaves elliptical, narrowed towards the apex and base, wedge-shaped 

 at base ; margins beginning some distance from the base, serrate-toothed, 

 with the teeth directed forwards ; midnerve strong towards the base ; pri- 

 mary nerves very slender, going off at a very acnte angle, and arching for- 

 wards to end in the teeth, sending off obliquely on each side alternate, very 

 slender, subordinate nerves; ultimate reticulation not seen. 



Locality: Fredericksburg; quite rare. 



VITIPHYLLUM (Cissites ? ), gen. nov. 



Leaves small, approximately fan-shaped, cut to different depths into 

 obtuse, flabellately arranged lobes of varying shapes and size ; nerves 

 mostly radiating from the top of the petiole, the main ones generally three 

 in number, the middle one being the strongest ; petioles very long and 

 comparatively stout. The leaves, which I group under this head from their 

 general resemblance to Vitis, form a ver}^ considerable element in the Poto- 

 mac flora as found in the beds at Baltimore. They are abundant there and 

 are the most common plants at that locality. They have most affinity with 

 some of the fossils described by authors under the name Cissites. 



VlTIPHYLLUM CRASSIFOLIUM, Sp. nOV. 



Plate CL, Figs. 9, 10. 



Form of leaves not made out, as only segments w^ere seen ; principal 

 segments of comparatively lai-ge size, incised obliquely into oblong-obtuse 

 lobes, which in turn are notched at the summit to form two or three shal- 

 low obtuse lobes ; nerves going off obliquely one into each main lobe, 

 slender and imperfectly shown, only one branch seen in each lobe ; leaf- 

 substance veiy thick ; ultimate nervation not seen. 



Locality: Road-side near Potomac Run; very rare. 



The specimens shown in Figs. 9, 10, seem to be fragments of princi- 

 pal or primary segments of the leaf, probably the middle one. 



