68 



meters long, represented by an analogous form in the Miocene of Greenland. 

 Gaudin, in his Contributions, (I, p. 31, PI. vi, Figs. 6-7,) desci'ibes Fagus 

 sylvatica from the Miocene of Tuscany. His species is represented by two 

 leaves, one of which (Fig. 6) would seem a counterpart of ours but for the 

 more distant and less numerous secondary veins. The Tertiary leaf has only 

 eight veins when perfect, while, if the point was added to the Cretaceous 

 one described here, it would have no less than fifteen. 



The presence of a Fagus in the formation of the Dakota group should 

 be taken into account as an indication of the temperature of that epoch, 

 especially in searching for relative species of our time. 



Habitat. — Decatur, Nebraska, Hayden. A single specimen. The locality 

 of the leaf described by Dr. Newberry is marked Smoky Hills, Kansas. 



Ficus (?) halliana, sp. nov., PI. xxviii, Figs. 3, 9. 



Leaves hard, subcoriaceous, very entire, rietioleu, oblong-lanceolate, pointed, ntore or less obtusely 

 cuneate to the petiole ; nervation piunato ; lateral veins close, straight, parallel, numerous. 



The leaves, broader below the middle or a little above the base, are more 

 or less abruptly narrowed to the petiole, and gradually tapering to the point ; 

 the secondary veins, at an angle of divergence of 40°, are straight, numerous, 

 all equidistant and parallel, except the lowest pair, which is more oblique and 

 parallel to the base ; the reticulation is formed by intermediate or tertiary 

 veins, which anastomose with nervilles at right angles to the secondary veins, 

 forming loose, irregular, quadrate, or pentagonal meshes; medial nerve narrow; 

 secondary veins thin. 



It is at first difficult to admit that both these leaves are referable to the 

 same species. But in the fossil descriptions and representations of Tertiary 

 pinnately-nerved species of Ficus, the secondary veins are often, even upon 

 the same leaf, as in Ficus lanceolata, Heer, variable in distance, or close on 

 one side and distant on the other. The same difference is recognizable 

 in the Cretaceous leaves of Ficus geinitzii, Ett., (Flora v. Niedeeshoena, p. 16, 

 PI. ii, Figs. 7, 9-11,) whose forms and nervation have great analogy with those 

 of the Nebraska leaves. Fig. 11 has the secondary veins of the same type 

 as those of our Fig. 3, while the broader leaf of Figs. 9 and 9 b enlarged, has 

 a more open nervation, with close veins, and an areolation of the same char- 

 acter as seen in our Fig. 9. There is, however, especially between the frag- 

 ments represented (Fig. 9) and some species of Rhus — it. metopium, L., for 



