6i)2 GEOLOCY OF THE YELLOWSTONE NATIONAL VAllK. 



Anionji' living' .species H. culvcrl appears closer to H. ovatu (old (Vnv/« 

 alha 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 mouth of Elk Creek; 

 collected by F. IT. Kuowlton and CI. E. Culver, August, 1888. 



3I\KICACE.E. 



Myrica scottii Lx. 

 PI. LXXXIV, rig. »;. 

 Mliriin scottii Lx.: Cret. and Tert. FL, p. 147, PL XXXII, rigs. 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 l^elow Elk Creek, at Ijase 

 of l)lurt'; collected by F. H. Kuowlton, August, 1888 



Myrica wakdii u. sp. 

 PL LXXXIV, rig. 4. 



Leaf of tirm 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 oO^, 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 tigured is tlie only si)ecimen of this form . 

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

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



This species resembles more or less closely a nundier of descrilied 

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

 margiual nerve it resembles M. torrci/i Lx.,' from the Montana and Laramie, 

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

 size and shape M. ivanlu is nnu-h closer to M. pohimorplm Scliimp.," from 



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



-Cret. ;iii.l Ti-rt. Fl., p. 116, I'l. XXV, tigs. 1, 2. 



