198 THE POTOMAC OR YOUNGER MESOZOIG FLORA. 



within it, by a comparatively broad flat pedicel, in shape elongate-elliptical 

 to oblong, length reaching 8*^'" and width 15"". Nerves fine, numerous, 

 closely placed, forking near the base, and parallel to near the summit, where 

 they are a little more crowded; the outer nerves on the upper margin end 

 in the margin of the leaves some distance below the summit. 



Localities: Fredericksburg; banks of Dutch Gap Canal ; fishing-hut 

 above Dutch Gap Canal. It is most common at Fredericksburg, but is rare 

 everywhere. 



Nagieopsis ceassicaulis, sp. nov. 



Plate LXXIX, Figs. 2, G; Plate LXXXII, Fig. 1; Platu LXXXIV, Figs. 3, 9, 11. 



Leaves with very thick stems even at the summits of the leafy twigs ; 

 leaflets attaining very considerable dimensions; length not made out, width 

 up to 27"" and over, gradually narrowed to the base and tip; elongate- 

 elliptical in shape, attached by a short slightly twisted pedicel to the margin 

 of the stem, or slightly within it; nerves at the base and sumnn"t of the 

 leaves, so far as seen, indistinct and not well made out, fine and rather 

 remote. 



Localities: Road-side near Potomac Run; Fredericksburg; Kankey's; 

 72d mile-post, near Brooke; banks of Dutch Gap Canal; fisliing-hut above 

 the canal. 



The plant is rare, and having long narrow leaves, with a thin leaf-sub- 

 stance, the leaves are usually found detached and in fragments; in this re- 

 spect it is more like Zamites than most of the species of Nageiopsis. The 

 nerves are usually so fine and the leaf-substance .so thick, that they can not 

 be clearly made out. It is not certain that .some of the specimens placed 

 in this species are not Zamites. 



Nageiopsis latifolia, .sp. nov. 



Plate LXXXII, Fig. 3. 



Leaves very broad and short, base and apex not seen; leaf-substance 

 thin; shape of leaves probably broadly elliptical ; nerves not fully disclosed, 

 but probably branching near the base; they are then approximately parallel 

 to near the apex, following the margins, and parallel. 



