736 GEOLOGY OP THE YELLOWSTONE NATIONAL PAEK. 



also somewhat like A. trilobatum tricuspidatum Heer, as figured by Professor 

 Ward from the Fort Union 1 group, differing* in being much more wedge- 

 shaped at base, and in the angle of the lateral ribs and secondaries. 



Habitat: Fossil Forest Ridge, bed No. 3, "Magnolia bed;" collected 

 by Ward and Knowlton, August, 1887. 



Acer, fruit of. 

 PL XOVIII, fig. 5. 



The collection contains several of these fruits, the best of which is 

 figured. While they are very definite and clearly belong to Acer, they are 

 not usually regarded as being sufficiently distinctive for specific reference. 

 A number have been figured and named also, but I have preferred not to 

 name these. They may possibly belong to the preceding species, but of 

 this there is no proof. 



Habitat: Crescent Hill above Yancey s; collected by W. H. Weed, 

 September 28, 1885. 



SAPINDACE.E. 



Sapindcs affixis Newby. 



PI. Oil, figs. 1-3. 



Sapindus affinis Newby. : Later Extinct Floras, p. 51; 111. Cret. and Tert. PL, PL XXV, 

 fig. 1. 



The material upon which this determination is based is ample, as it 

 consists of fully 100 specimens, all more or less well preserved. These 

 specimens differ so much in size that it was at first thought that at least 2 

 species must be represented, but after a careful study it has been found 

 impossible to draw any satisfactory line between them. There are all 

 gradations of size from the little slender leaflets, hardly 4 cm. long, to the 

 large ones, fully 10 cm. long. 



In the only published figures of this species by Newberry the nerva- 

 tion is not shown, but the National Museum contains the original New- 

 berry material, and on studying this it is found that the nervation agrees 

 perfectly with the specimens from the Yellowstone National Park. It may 



i Types of the Laramie PL, PI. XXIX, fig. 3. 



