JJe 1?HE FLOKA OF THE DAKOTA GKOUP. 



GYMNOSPERM^e. 



Order CYCADACE^. 



Tribe ENCEPHALARTE^E. 



Subtribe ZAMIE^. 



Zamites species. 

 PI. I, Fig. 8. 



Leaf coriaceous, naiTOwly lanceolate-acuminate, 1"" broad in the lower 

 part, where it appears broken, H""' long ; nerves very close, parallel, 

 scarcely distinct. 



The fragment is comparable in its form at least to the leaves of Z. 

 Feneonis Brongn., as figured and described by Schimper,^ of which, however, 

 the nerves are more distinct and distant and all equal. In our leaf the 

 nerves are so thin and close that they can be counted only with a strong- 

 glass and are separated at a distance of 1°"" by a few more distinct ones, 

 though also very thin. . It does not appear that these last nerves are casually 

 swelled or regularly marked as primaries, separated by thinner secondaries, 

 as in the leaves of species of Glumacese, such as Cyperus, Phragmites, etc. 

 The hard texture of the leaf, which is even coriaceous, and the very thin 

 nervation, militate against the reference of the fragment to any glumaceous 

 plant. 



Habitat: Ten miles northeast of Delphos, Kansas. No. 4060 of the 

 collection of Mr. R. D. Lacoe, of Pittston, Pennsylvania. 



PoDOZAMiTES Haydenii Lesq. 



Cret. aud Tert. Fl., p. 27. 



Pterophyllum f Haydenii Lesq., Hayden's Ann. Rept., 1874, p. 334 ; Cret. Fl., p. 49, 



PI. I, Figs. 6, 6b. 



PODOZAMITES OBLONGTJS Lesq. 



Cret. and Tert. Fl., p. 28, PI. i, Figs. 10, 11. 



' Pal. V6g., vol. 2, p. 152; Atlas, PI. utxi, Fig. 2. 



