84 THE LATER EXTINCT FLORAS OF NORTH AMERICA. 



to raake any division without making several. They are, therefore, all 



grouped together for the present. 



Formation and locality: Tertiary (Green River group). Green River 



Station, Wyoming. 



Celtis parvifolia Newb. 



PI. LIH, fig. 6. 



Proc. U. S. Nat. Mus., Vol. V (March 21, 1883), p. 510. 



"Leaves small; oblong-ovate in outline; rounded and unsymmetrical 

 at the base, pointed at the summit; margins, except at the base, coarsely 

 dentate; nervation sparse; two principal branches on each side of midrib, 

 one pair springing from the base and throwing off branchlets, another 

 strong pair issuing from the midrib at the middle of the leaf, other delicate 

 branches given off near the summit." 



Collected by Dr. F. V. Hayden. 



In its general aspect, as well as its details of structure, this leaf very 

 closely resembles C. Australis, differing from our living G. occidentalism as 

 well as from the fossil species that are found in the Tertiary beds of this 

 country by its simpler nervation, its smaller size, and the relatively coarser 

 serration of the margin. 



Formation and locality: Tertiary (Eocene!). Tongue River, Montana. 



Order MORACEiE. 



Ficus (?) Alaskana Newb. 

 PI. LI, fig. 1 ; LII, fig. 1 ; LV, figs. 1, 2. 

 Proc. IT. S. Nat. Mus., Vol. V (March 21, 1883), p. 512. 



"Leaves large, reaching 8 to 10 inches in length and breadth; trilobed, 

 generally unsymmetrical; lobes pointed, usually obtuse; margins entire or 

 locally undulate; nervation strong, conspicuously reticulate; principal 

 nerves, three, giving off branches, which divide near the margins, some- 

 times connecting in festoons, sometimes craspedodrome ; tertiary nervation 

 forming a coarse network of usually oblong meshes filled with a fine 

 polygonal reticulation; upper surface of the leaf smooth and polished, 

 lower roughened by the reticulation of the nerves." 



Collected by Captain Howard, IT. S. N. 



These beautiful leaves have been referred with much doubt to Ficus. 

 They present considerable resemblance to some of the leaves of Ficus 



