DESCRIPTIONS OF SPECIES. 79 



sinuses that separate them, three nearly equal on either side, summit broadly 

 rounded or obscurely lobed, often oblique; nervation strong and simple, 

 midrib straight or slightly flexed, giving off lateral branches, which run to 

 the margins of each lateral lobe." 



The general form of this leaf is much like that of our living Q. obtusiloba, 

 though it is smaller and more symmetrical. Among the many fossil species 

 which have been described there is none which approaches this very closely, 

 most of them bearing either simple, entire leaves, or toothed, rather than 

 lobed ones. 



Formation and locality: Cretaceous (Dakota group). Banks of Rio 

 Dolores, Utah. 



Quercus Sullyi Newb. 



PL LX, fig. 2. 

 Proc. IT. S. Nat. Mus., Vol. V (March 21, 1883), p. 506. 



"Leaves ovate, pointed, wedge-shaped, or rounded at the base; mar- 

 gins set remotely or closely, with acute, spiny-pointed teeth; nervation 

 strong, somewhat flexuous; lower pair of lateral nerves giving off numerous 

 branches; middle and upper pairs simple below, forked at the summit." 



Collected by S. M. Rothhammer, on the expedition of Gen. Alfred 

 Sully. 



The characteristics of these leaves are but imperfectly shown in the 

 figure, but the general form, margin, and nervation can be very well made 

 out from the numerous fragments contained in the collection made by the 

 Sully Expedition. It is evident that we have here one of the Ilex-like 

 oaks, and indeed it may be a question whether it is not rather a holly 

 than an oak. The leaf was generally unsymmetrical, the nervation strong 

 but flexuous, the surface roughened by the tertiary nerve branches. In a 

 general way these leaves resemble those of the common evergreen oak, 

 Quercus agrifolia of California, but the spines of the margin are smaller 

 and more numerous, the leaves more elongate and pointed. It is evident, 

 however, that the tree which bore them belonged to the same group of 

 oaks. 



Formation and locality: Tertiary (Eocene?). Burned shales over lig- 

 nite beds, Fort Berthold, Dakota. 



