with Descriptions of X> w Sp< '■ s of Fossil I ' 



usually broadly cordate; the nervation of the base and lateral 

 portions of the leaf being supplied from the first or basal pair 

 of lateral nerves, which are largely developed, much branched, 

 and reach considerably above the middle point of the lati 

 margin. In Corylus, on the contrary, the basal nerves are 

 short and supply only the basal margins; the second pair of 

 lateral nerves is relatively more developed than in 77 

 Morus, etc., and in the number and parallelism of the lateral 

 nerves they approach more nearly to the Btrictly feather-veined 

 leaves of Fagus, Alnus, etc. 



Formation and Locality. Miocene Tertiary strata, Fort 

 Union, Dacotah. (Dr. Ilayden.) 



Cory In* graiitlifolia. (n. Bp.) 



Leaves large (5-6 inches long), short-petiolcd, unequally cord 

 at the base, pointed above, coarsely and unequally dentate ; n< 

 tion strong; midrib straight or curved, not Binuous ; lateral ne> 

 6-7 pairs; lower pair diverging at a larger angle than the upper 

 ones, and supporting a number of short, generally simple, brand 

 on the lower side, which terminate in the basal margin ; second 

 pair diverging at an angle of 45°, reaching the margin about the 

 middle, supporting about 4 branches on the outside; upper | 

 simple or branched once, rarely twice. 



This was evidently a large, thick, ronghish leaf, having m 

 the aspect and texture of the leaves of the mulberry than ol 

 hazel. The nervation is, however, much nearer t 

 latter genus. Indeed, in all essential characters it Is thi 

 as that of the three species of Corylus with which it 

 ated. The dentation of the margin, also, i 

 partially double, much more like that of the It 

 than of any of those with which I bfl 



Formation >>/"/ Locality. Lignite 'I 

 Union, Dacotah. (Dr. Eayden.) 



Cory In* Ann in ana. 



Amon* the variety of specimens of the le I ! 



cana with which I have compare. I I 



