684 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



by Professor Ward or with the types as shown by Heer. They are quite 

 obscure, but iu all probability they are identical with Heer's form. 



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

 Creek, Yellowstone National Park ; collected by F. H. Knowlton, August, 

 1888. 



CYPERACE/E. 



Cyperacites angustior (Al. Br.) Schimper. 



Cyperacites angustior (Al. Br.) Scliimp. : Pal. veg. Vol. II, p. 414, 1S70. 

 Cyperites angustior Al. Br. Lesquereux: Aim. Kept. U. S. Geol. and Geog. Surv. Terr., 

 1872 (1873), p. 403. 



This species was identified by Lesquereux, but. the material can not 

 now be found. 



Habitat: "Elk Creek, near Yellowstone River; collected by A. C. 

 Peale, Joseph Savage, and 0. C. Sloane." 



Cyperacites giganteus n. sp. 

 PL LXXXII, fig. 10. 



Leaves large, thick, with strong midvein and numerous close nerves. 



This species, although fragmentary, is represented by several leaves 

 and stems. The largest is 1 8 cm. in length and about 7 mm. in width. It 

 has a well-defined midnerve or vein and numerous close veins. It was 

 evidently of very firm texture. 



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

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



Cyperacites? sp. 

 PI. LXXXIII. fig. 4. 



This fragment is all of this species, whatever it may be, that has thus far 

 been found. It was at least 2.5 cm broad and had a well-marked keel. The 

 veins are strong, about 1 mm. apart, with a fine intermediate vein. There is 

 altogether too little of it to venture a specific description or determination. 



Habitat: Cliff west of Fossil Forest Ridge; collected by Ward and 

 Knowlton, August 15, 1887. 



