334 GEOLOGICAL SURVEY OF THE TERRITORIES. 



Gleichenia Kurriana, Heer., Cret. Flor., p. 47, PI. I, Figs 5-5 c . 



Frond pinnate ; pinnae long, linear, pinnately equally lobed ; lobes nearly 

 at right angle to the rachis separated to near the base ; medial nerve thick, 

 pinnately branching, veins forking at the middle. 



Gleichenia Nordenskioldi, Heer, Flor. Foss. Arct., p. 50, Tab. IX, 

 figs. 6-12.— PI. II, fig. 5. • 



Frond slender dichotomous, bi-polypinnate ; ultimate pinnce alternate-, 

 rigid, open, linear, parallel; leaflets free, oblong obtuse, rounded at their 

 base, inclined upward, coriaceous; secondary veins few, three or four pairs, 

 the lower forking, the upper simple. 



This species is very distinct from the former, and the differences in 

 the characters easily seen even in onr fragmentary specimens. In the 

 one figured here, the pinnules are separated to their base, and not mere 

 lobes as in the former ; they are turned upward, and by the upper basilar 

 border they compress the rachis, which becomes evidently flexuous, in 

 our specimen, at least ; the veins, also, are more distant, or less divided. 

 The fructifications of this fine fern are marked upon the specimens of 

 Greenland by two large round sori on each side of the middle nerve, 

 near the base of the leaflets. There is no difference whatever in any 

 of the characters of the Kansas specimen with those of the Greenland 

 form. Even the undulation of the primary rachis distinctly remarked 

 in Tab. IX, fig. 7, of Heer's flora, is equally distinct in the primary 

 rachis of the fragment figured here. This species has been observed on 

 specimens from the Lower Cretaceous of Greenland only, wherefrom 

 Professor Heer has described thirteen species of Gleichenia, while only 

 two were found in the specimens of the Upper Cretaceous of the same 

 country. 



Habitat. — Near Fort Harker, Kansas, Ghs. Sternberg. 



PHiEXOGAMOUS. 



CYCADEJE. 



« 



Pterophyllum (?) Haydenii, Lesqx., Cret. Flor., p. 49, PI. I, fig. 6. 6 C . 



Frond linear, simply pinnate ; rachis rugose, half an inch broad or more, 

 marked by circular dots in vertical rows, and regularly placed about half a 

 centimeter distant, apparently scars of the points of attachment of the 

 pinnce; pinnce (or leaves) entire, oblong, oval-obtuse, slightly arched on 

 the lower side, flat, attenuated at the round point of connection to the 

 rachis, regularly and narrowly striated lengthwise. 



Of this peculiar organism, no other part has been discovered except 

 the fragment figured. Professor Heer regards it as unreferable to the 

 Gycadece, on account of extraordinary broad stem, and supposes that it 

 should rather be considered as a Conifer, of the section of the 

 Araucarites. This opinion seems confirmed by the presence upon the 

 same specimens of the cone described here below as Abietifes Ernestiiue, 

 both cone and branch being originally described as representing a 

 same species related to Pterophyllum Frnestinm of Stiehler, described 

 from similar fragments in the Paleontographica. 



CONIFERS. 



Abietites Ernestine, Lesqx., Cret. Flor., PI. I, fig. 7. 



Gone oblong, abruptly narrowed to a short pedicel, scales broad, truncate, 

 cqypressed and imbricated. 



