DESCmrTlON OF THE Sl'EClES. 199 



Localities: Fishing-hut above Dutch Gap Canal ; road-side near Poto- 

 mac Run ; very rare. 



Several detached leaves of this plant were found at the fishing-hut 

 above Dutch Gap Canal. Iht-}' occurred together, as if coming from the 

 same plant, but were detached so as to give no intimation of the mode of 

 attachment, kind of stem, etc. The most complete of these leaves is given 

 in the figure. Fragments indicating even greater width than that of the one 

 figured were seen. The maxinnnn dimensions indicated were 12"" by i")"". 

 It is possible that this plant is a broad-leaved rodozaniitvs, similar to the 

 broad-leaved forms such as Podozumites Reinii Geyler, described by Geyler 

 from the Jui'assic formation of Japan. (Ueber Foss. Pflanzen aus der 

 Juraforui. Japans, PL XXXIV, Fig. 2.) 



Nageiopsis decrescens, sp. nov. 



Plate LXXVII, Fig. 3. 



Leaves, so far as seen, small, closely placed, narrowed at the l)ase and 

 apex, diminished greatly and abruptlv in ascending on the leafy twigs, in 

 shape narrowly oblong to linear; nerves forking at base, parallel to near 

 the apex, the outer ones ending in the margins just below the apex. 



Locality : Road-side near Potomac Run. 



Only one specimen of this plant was found. It shows the peculiarity 

 of a sudden diminution of the leaves in ascending. As a rule the leaves 

 of the species of this geinis diminish towards the lower portions of the 

 leafy branches if there is any inequality in them. 



Nageiopsis ovata, sp. nov. 



Plato LXXVII, FiR. 4; Plato LXXX, Fig. 5. 



Stems comparatively very stout ; leaves opposite, going off nearly at 

 right angles from the stem, closely placed, lower ones smaller but gradually 

 increasing in ascending, broadest near the base and abiuptly rounded off 

 there, attached by an extremely short slightly twisted pedicel, narrowing 

 to an acute tip, oblong to elongate-elliptical in shape ; nerves indi.stinct, 

 but forking at base, diverging on entering the base of the leaf, then nearly 



