FOSSIL FLORA. 729 



long and about 10 cm. broad. It was probably, when living, at least 15 

 cm. long. 



The marked feature of this leaf is that it is not strictly palmately 

 nerved, having, as pointed out in the diagnosis, the 2 lower pairs of 

 secondaries with branches on the outside which end in the marginal teeth. 

 Otherwise it is hardly to be distinguished from Platanus raynoldsii Newby., 

 as figured by Lescpiereux 1 from the Denver beds of Golden, Colorado. 

 This species was described by Newberry 2 as having the margin doubly 

 serrate, but a number of specimens referred to it by Lesquereux have the 

 margin undulate, dentate, or even entire. Newberry's type had 3 lobes or 

 points in the upper portion, while certain of Lescpiereux's specimens were 

 rounded and entire above. 



The smaller leaves from the lower Yellowstone described by Professor 

 Ward under the name of Grewiojjsis populifolia, 3 especially fig. 4 of his plate, 

 approach the leaves under discussion. These, as he has already pointed 

 out, are suggestive of P. raynoldsii. The}" can hardly belong to Grewiopsis. 



Whether the leaves from the Yellowstone National Park should be 

 regarded as new to science or referred to Platanus raynoldsii is an open 

 cpiestion. They agree closely enough in size, shape, and marginal dentition, 

 but differ in the nervation. It is possible that this character may be of 

 sufficient importance to keep them distinct, and also to exclude them from 

 the genus Platanus, but for the present at least, and until better material 

 can be obtained, they may remain as above. 



Habitat: East slope of high hill about three-fourths of a mile south 

 from Yanceys; collected by George M. "Wright, September 4, 1885. 



LEGUMINOSiE. 



Acacia macrosperma n. sp. 

 PI. XCVIII, tig-. S. 



Legume large, more than 8 cm. long and 2.2 cm. wide, broad linear. 

 ]M>->ilily constricted, with obtuse, regularly rounded end; apparently sur- 

 rounded by a wing 5 nun. broad; seeds numerous, large, oblong, in mm. 



luiin-, i; mm. i)i'(,;i(|. 



' Tort. PI., PI. XXVI. fig, I ; PI. XXVII, figs. 1-3. 



- Later Ext. El., p. 69; Ill.Cret.and Tert., PI. XVIII. 



'Types of i ],,- Laramie PI., p. 90, I'l. XL, figs. 3-5. 



