FOSSIL FLOliA. 669 



the tvi)e, and the nerves may not fork. It is possible that it is a new 

 species, but until better material can be obtained I have preferred to retain 

 the specimens under this species. 



Habitat: Yellowstone River, onedialf mile below mouth of Elk Creek; • 

 collected by F. H. Knowlton, August 13, 1S,S8 (tig-. G). Yellowstone River, 

 wall of canyon abo\'^ mouth of Hellroaring Creek; collected by W. H. 

 Weed, October 13, 1887. 



AsPLENiaJI KEMOTIDENS n. sp. 

 PI. LXXX, fig. 7. 



Pinuc-e large, coriaceous, broadly lanceolate, taper pointed, obtuse 

 and unecpral sided at l^ase; margin with few remote sharp teeth; midvein 

 strong; lateral veins at an angle of about 4.5', simple or forking (Mice some 

 distance above the midvein; sori not seen. 



Tlie very perfect example tigured is the only specimen ol)tained. It 

 is 11 cm. in length and 2.5 cm. broad. It is broadly lanceolate witli a 

 slender tapering apex and ol)tuse unequal-sided base. The nervation is 

 very obscure. It is probable that all of the lateral veins fork, l)ut it was 

 not possilde to make this out, and tlie figuj-e shows many as unforked. 

 The ones that are made out to have the tbrk show it some distance above 



their base. 



This species is very closely allied to, if not indeed identical witli, 

 Asplemum erosiim (Lx.) Kn.,' from the Denver formation of Colorado. It 

 lias exactly the same shape, but differs in having few remote teeth, and in the 

 branchino- of the veins. In A. erosuni the veins fork at the base and occa- 

 sionally above the middle. In any case the species are very close together 

 and may be combined at any time if future material from the Yellowstone 

 National Park shows variation in the characters now relied upon for their 

 separation. 



Habitat: Yellowstone River, one-half mile below mouth of Elk Creek, 

 at base of bluft"; collected by F. H. Knowlton, August, 1888. 



Dryopteris weeuii n. sp. 

 PI. LXXX, fig. S; PI. LXXXI, fig. 2. 

 Frond twice pinnate; pinnaj probably lanceolate in outline; pinnules 



I Under Pteris erosa Lx., Tert. Fl., p. 53, PI. IV, fig. 8; Cret. and Tert. Fl., p. 121, PI. XIX, fig. 1 . 



