DESCRIPTION OF THE SPECIES. 197 



The leaflets attain a maxiimim width of 2"" and a leiig-th of 7"". Tliey are 

 widest near the base, and taper gradually to an acute tip, are abruptly nar- 

 rowed at base and rounded off, attached by a very short, slightly twisted 

 foot-stalk mostly to the sides of the stem, usually distichous, varying in 

 shape from narrowl}- ovate to linear-lanceolate, opposite nearly always; 

 nerves remote and distinct, forking at or near the insertion of the leaves, 

 diverging- strongly on entering the leaf, and almost parallel to near the 

 summit, wliere they are more crowded together, the outer ones terminating 

 in the margins below. 



Localities: Fredericksburg; banks of Dutch Gap Canal: tisliinghut 

 above Dutch Gap Canal. 



This tine plant is abundant at Fredericksburg, but it is quite rare at 

 otlier localities, only a few imperfect specimens being found, as, for ex- 

 ample, at Dutch Gap. As will be seen from the figures, the leaves varv a 

 good deal in size, shape, and distance apart; the smaller are often more 

 crowded than the larger ones. The fine specimen given in PI. LXXIX, Fig. 

 1, ajjparently branched several times. In PI. LXXX, Fig. 1, a thick strong 

 stem is shown, and the leafy twig had evidently considerable length, the 

 leaves being comparatively remote from each other. Fig. 4 of the same 

 plate gives fragments of a copiously branching stem, the junction of one 

 terminal and two lateral twigs being shown radiating from a common point, 

 which seems to be a usual mode of branching in the plants of this genus. 

 The two lower left-hand twigs seem to come ofT in a similar manner from 

 down lower on the stem. The leaves on this specimen are much crowded. 

 In PI. LXXXI, Fig. 1, we have apparently the same mode of branching. 



This plant, in the nerves and shape of the leaflets, is so much like a 

 Zamites, vhat for some time I held it to be a cycad. It is the most abundant 

 species of Nageiopsis found at Fredericksburg. Unlike the leaves of 

 Zamites and I'odozamites, those of this and the other species of Nageiopsis 

 seem to be quite persistent, for they are usually found attached to the stem. 



Nageiopsis ekcurvata, sp nov. 



Plate LXXV, Fi;,'. 2; Plate LX.XIX. Fi^'. 4; Plato LXXX, Fig. :5. 



Stems stout, leaves remote, recurved, subacute to obtuse, gradually 

 narrowed to the base, and attached to tiie margin of the stem, or slightly 



