DESCRIPTION OF SPECIES— JDGLANDE^. 283 



R h :i 111 II u s R o s s ni ii s s I (■ r i , Uug. 



Plate LIV, Fig. 4. 



IHiamnus Bossmasgleri, Ung., Gen. et .Sp., \x 464. — Heer, Fl. Tert. Ilelv., iii, p. 80, pi. cxxiv, figs. 18-20. 

 riij/llites rhamnoidcs, Rossm., Beitr. z. Versteiu., j)!. viii, figs. 30, 31. 

 Bhammts aizoidcs, Uug., Sillog., ii, p. 17, pi. iii, f. 47?. 



Leaves narrowly obovate, obtusely pointed, very entire ; lateral nerves curving in passing to the 

 borders ; nervilles thin. 



The shape of the leaves, somewhat inequilateral, with the obtuse point 

 slightly turned to one side; their size also, five centimeters long and three 

 broad, the direction and relative distance of the lateral nerves, are the same 

 as in the leaves of this species, figured by Heer from the Miocene of 

 Switzerland. The average angle of divergence of the lateral nerves is 40° 

 to 50°; their simple bows follow quite near the borders. I am unable to 

 point out any difference between this and the European leaves described 

 under this name. 



Habitat. — Black Buttes, Wyoming, in sandy shale above the main coal. 

 The only leaf found. 



TEREBIiNTHINEi]. 

 JUGLANDE^. 



The distribution of the species of this family in the geological times, 

 compared with that of our present flora, presents for Europe a peculiar 

 anomaly, and for North America a remarkable analogy. We find Juglans 

 already represented in the European Cretaceous by one species, described 

 by Heer, from Moletin. The leaflets are very large and with entire borders. 

 There is apparently also one species present in the Cretaceous of Nebraska, 

 fur numerous leaflets of compound leaves have been referred, with doubt, 

 however, to this genus from the Dakota group. From the Eocene of Europe, 

 three species of Juglandltes are described, in the Sezanne Flora by Count 

 Saporta, from leaflets cither entire or minutely denticulate, both characters 

 represented in the leaflets of the same species, as if we had here the first 

 traces of denticulation in leaves of Juglans. Higher up in the Tertiary 

 formations, or from the lowest part of the Miocene to its end, European 

 paleontologists have found a very large number of species of this family, 

 not less for Juglans than fourteen, represented by entire leaflets, ten by ser- 

 rate ones, and twelve by fruits, besides seven more, of uncertain affinity, 

 described by Massalongo. Of the genus Carya, they have, in the same Upper 



