672 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



or 6 lobes or pinnules, the sinuses toward the base going nearly to the 

 secondary rachis, more entire near the apex; lower pinnules or divisions 

 2 or 3 toothed, all, but especially the terminal pinnules, ending- in long, 

 slender, outward-pointing- teeth; nervation simple, consisting of a strong 

 secondary rachis with rather delicate nerves pointing to the pinnules; the 

 nerves near the base two or three times branching, the branches entering 

 the teeth; nerves near the extremity unbranched. 



The small fragment figured represents all that was found of this 

 species. It is only about 30 mm. long and 25 mm. broad, the pinna? being 

 17 mm. in length and approximately 10 mm. in width. 



Notwithstanding the smallness of the fragment, there is enough to 

 show that it differs markedly from any other form in the Park flora. I am 

 quite at loss, however, to indicate its generic affinities. I have placed it 

 under Devallia tentatively, and can only hope that subsequent material will 

 serve to fix more satisfactorily its position. 



Habitat: Fossil Forest Ridge, Yellowstone National Park, bed No. 

 3, "Magnolia bed;" collected by Lester F. Ward and F. H. Knowlton, 

 August 16-19, 1887. 



Lygodium kaulfusii Heer. 



PI. LXXX, tigs. 1-3. 

 Lygodium neuropteroides Ls.: Teit. Fl., p. (3L, PI. V, tigs. -1-7; PI. VI, tig. 1. 



According to Gardner, 1 the Lygodium neuropteroides of Lesquereux is 

 absolutely identical with L. kaulfusii of Heer. Lesquereux was shown 

 specimens of the true L. kaulfusii from the British Eocene and pronounced 

 them "positively identical" with his species from the Green River group 

 and later formations. A glance at Gardner's 2 figures shows that it is impos- 

 sible to separate the American specimens. 



This species was found at two localities in the Yellowstone National 

 Park, namely, on the Yellowstone River below the mouth of Elk Creek, 

 and on the north bank of the Lamar River between Cache and Calfee 

 creeks. The specimens from below Elk Creek are in hard, rather coarse- 

 grained rock at the base of the section. They are very large, having lobes 



1 Brit. Eoc. Fl., Pt. I, Filices, p. 47. "■ Op. oit., PI. VII, tigs. 1, 3-8 ; PI. X, fig. 11. 



