FOSSIL FLORA. 727 



secHiidaries at a very acute ano'le, ci'aspi^dodrome, alternate, lower pair 

 tliiiiuest, those iiljove niiicli thicker, branchini;- on the outside, ))raiiches at 

 ail acute angle, eraspedodronie; iuternie(liate secondaries several, generally 

 lost in the space between the secondaries; nerv-illes strong, at A-arions 

 angles, niainlv ])ercurrent; tiner nervation irregular. 



No perfect example of this species has been found, the fragments 

 figured being all that we have to represent it. The specimen showing the 

 wedge-shaped base is only o cm. long, but was probably 10 or 12 cm. in 

 length when perfect. It is 4 cm. wide. The larger of the others is the 

 wedge-shaped apical portion, and is 6 cm. long, with the probability of its 

 having lieen at least 12 cm. long. The small specimen was probably 

 hardly more than 8 or 9 cm. in length Avlien perfect. The upper portion 

 appears to have more numerous secondaries than the lower part. They are 

 also branched on the outside. 



Habitat: Yellowstone River, 1 mile below the mouth of Elk Creek; 

 collected by F. H. Knowlton, August, 1888. 



CiNNAJIOMUM SPECTAJULE Hccr. 



PI. XOIY, tig. <i. 

 Ciniiamonnoii .spevt,(hilc Hccr: Fl. Tert. Helv., Vol. H, p. Ill, PI. XCVI, figs. 1-8. 



The leaf tiguretl, whicli ap[)ears to be the only one obtained, differs 

 slightly from the figures of the European form to which it is referred. The 

 lower pair of secondaries, for example, are nearer the liase of the leaf than 

 in the figures given liy Heer, but, granting the slight differences, I have 

 hesitated to make it a new species. 



Habitat: Tower Creek, Yellowstone National Park; collected by 

 Arnold Hague (field No., 1036), August 16, 1883. 



rLATAXA( E.E. 



PlATANUS GUILLELJLE Gropp. 



PI. XGVI, tig. 1; PI. XCVII, flg. 5. 



This species is verv abundant, being represented b}- over 12.") more or 

 less perfect specimens. Some of these — as, for example, the one figured — 

 are particularlv perfect. Tliey differ somewhat in size, the average lieing 

 about 7 or 8 cm. broad between the lobes and 8 or 9 cm. in length. Au 

 occasional one is 14 cm. broad and abont the same length. 



