FOSSIL FLOKA. 729 



lono- and alioiu In ciii. hroad. 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 FIiiIkiui.s ruijnoUsn Newby., 

 as iigured 1)}- Lesquereux' from the Denver l:)eds of Golden, Colorado. 

 This species was described by Xewberry- as having the margin doubly 

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

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

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

 rounded and entire above. 



The smaller leaves from the lower Yellowstone descrilied by Professtn- 

 Ward under the name of Grcniojisis pcqutHforKi,'' especially tig. 4 of his jjlate, 

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

 out, are suggestive of F. )rii)iiohlsii They can hardly Ijelong to Grewiopsis. 



Whether the leaves from the Yellowstone National Park should be 

 reo-arded as new to science or referred to PJatuuns raijmldsU is an open 

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

 but differ in the nervation. It is possible that this character ma}" 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 aljout three-fourtlis of a mile south 

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



LEOIMINOSE. 



Acacia macrosperma n. sp. 

 PL XC VI II, tig. S. 



Leo-ume large, more than 8 cm. long and 2.2 cm. wide, broad linear, 

 possibly constricted, with obtuse, regularly rounded end; apparently sur- 

 rounded by a wing 5 nnn. broad; seeds numerous, large, oblong, 10 mm. 

 long, 6 mm. broad. 



' Tert. Fl., PI. XXVI, tig. 4 ; PI. XXVII, figs. 1-3, 



"- Later Ext. El., p. 69 ; 111. Cret. and Tert., PI. XVIII. 



= Types of the Larainie Fl., p. 90. PI. XL, tigs. 3-5. 



