28 DESCRIPTION OF SPECIES. 



The leaves closely resemble those of Podozamites lanceolatus as figured 

 by Nathorst, " Fl. of Bjuf.," pi. xvi, fig. 3. I think, therefore, that the frag- 

 ments figured in "U. S. Geol. Rep.," figs. 6 and Qh, should be referred to 

 this genus. The relation of the cone, however, which I referred to the 

 same species from its likeness to that of Stiehler as Pterophyllum Ernestince, 

 is wrong, as it evidently represents a Conifer. 



Podozamites oblongus, Lesqz. 

 Plate I, Figs. 10, 11. 



Leaves oblong, gradually narrowed from below the middle to the flat sessile base, 

 rounded at the eroded apex; veins thin, parallel, close, equal, distinct with the glass. 



These leaves are evidently overturned upon the plate. The appar- 

 ently truncate lower part seems as an enlarged point of attachment sim- 

 ilar to that of species of Cordaites of the coal. But the irregular erosion 

 is accidental or caused by compression of the macerated apex of thick 

 coriaceous leaves. 



These leaves are of the same character as those of P. lanceolatus, 

 Schp., in Heer, "Fl. Arct.," iv, pi. vii, figs. 1-7 of the Jurassic Flora of 

 Spitzbergen, differing by the more abruptly rounded apex. 



Hah. — Dakota Group, Kansas. Chs. Sternberg. 



Podozamites angustifolius ? Heer. 



Leaves long and narrow, somewhat falcate or ensiform, linear-lanceolate, grad- 

 ually slightly narrowed upward from the middle, obtuse? (point broken) more rapidly 

 downward from below the middle to the point of attachment, distantly veined ; primary 

 veins obtuse, prominent; surface smooth, minutely lineate. 



The preserved part of the leaves is 11 centimeters long, averaging 

 9 millimeters broad. The point of attachment is flat, 3 millimeters 

 broad. As the apex of the leaf is broken it is not possible to see if it is 

 acuminate. 



The leaves figured by Heer, "Fl. Arct.," iv, pi. vii, figs. 8-11, and pi. 

 viii, fig. 5, are either acuminate or somewhat obtuse and slightly scythe- 

 shaped, as in the one described here, but this is broader than any of those 

 of Heer. The nri'vation seems like that of P. Eichwaldi, Heer, ibid., the 

 primary veins being broad, thick, or prominent, so that the surface appears 

 undulate and the intervals marked by irregular or not continuous very 

 small veinlets. This leaf is also, from its shape and size, comparable to 



