692 • GEOLOGY OF THE YELLOWSTONE NATIONAL PAKK. 



Among living species H. culveri appears closer to H. ovata (old Carya 

 alba Nutt), which has, however, sharper teeth and more regular nervilles. 

 The secondaries and their branches entering the teeth are much the same 

 in both. 



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

 collected by F. EL Knowlton and CI. E. Culver, August, 1888. 



MYRICACEiE. 



Myrica scottii Lx. 

 PL LXXXIV, fig. 6. 

 Myrica scottii Lx. : Gret. and Tert. EL, p. 147, PL XXXII, figs. 17, 18. 



A single fairly well preserved leaf, that seems without question to 

 belong to this species. It has been found before only at Florissant, Colorado. 

 Habitat: Yellowstone River, one-half mile below Elk Creek, at base 

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



Myrica wardii n. sp. 

 PL LXXXIV, fig. i. 



Leaf of firm texture, lanceolate, long wedge-shaped at base, obtusely 

 denticulate from some distance above the base; midrib thick; secondaries 

 thin, rather scattered, alternate or subopposite, emerging at an angle of 

 about 50°, arching evenly around and joining the one next above at a little 

 distance from the margin, their union forming a continuous marginal line, 

 from the outside of which small veins enter the obtuse teeth ; nervilles thin, 

 percurrent. 



Unfortunately the fragment figured is the only specimen of this form 

 collected. This is 5.5 cm. long and about 12 mm. wide. When entire, it 

 was probably 10 cm. or 12 cm. in length. 



This species resembles more or less closelv a number of described 

 species, yet undoubtedly differs from all. Thus, in the matter of the intra- 

 marginal nerve it resembles M. torreyi Lx., 1 from the Montana and Laramie, 

 but is much larger and has a greater number of parallel secondaries. In 

 size and shape M. wardii is much closer to M. polymorpha Schimp., 2 from 



'Tert. Fl., p. 129, PI. XVI, ligs. 3-10. 



-Cret. unci Tert. Fl., p. 11(3, PI. XXV, tigs. 1, 2. 



