288 GEOLOGICAL SURVEY OF THE TEREITOEIES. 



lateral lobes and ascend to its point. The secondary veins as seen 

 near the point of the middle division are close to each other, curving 

 along the borders, but the areolation is obsolete. The border of the 

 leaf is entire, and though the lobes on one side are curved down into 

 the stone, and on the other side partially erosed, the outlines of the 

 whole leaf are easily made out. 



QuEECUS ^MULANS, sp. iiov. A large leaf, 4 inches long, 2 inches 

 wide, broadly oval, (point and petiole broken,) gradually curving to 

 the base, with borders equally dentate from below the middle upward, 

 entire or merely undulate downward ; medial nerve narrow, deep ; sec- 

 ondary veins irregular in distance and direction, (angle of divergence 

 about 40°,) slightly curving upward, nearly simple, craspedodrome; a 

 species not satisfactorily known as yet, related by the form of the leaf 

 to Quercus furcinervis, Heer, as figured in Fl. Arc, I, PI. xlv. Fig. 1 dj 

 but far different by the irregularity of th-e secondary veins curved in 

 ascending to the borders and by the sharp teeth turned up from an 

 obtuse sinus, as in the leaves of our Castanea pumila. The leaf is twice 

 as large as that of Heer. 



JuGLANS ACUMINATA, (?) Heer. The point of a leaf, from the middle 

 upward, merely differing from the general form of the species by the 

 longer tapering point of an apparently narrow leaf. Probably repre- 

 sents an inferior leaflet of this species. 



6. Washakie Group, Creston, W. T. 



Soft, greenish clay, a kind of soapstone, easily cut with the knife. 



AcoRUS BRACHYSTACHYS, Heer, (Fl., Spitz., p. 51, Tab. viii, Figs. 7 

 and 8.) A fragment of the same size and form as the branch figured on 

 the left side of PI. viii. Fig. 8, bearing also a small sessile ear of the 

 same size. In one specimen part of the seeds have been detached from 

 the receptacle, and thus the spiral direction of the axis and the mode of 

 attachment of some of the seeds are distinctly seen. 



Paliurus Colombi, Heer. (Fl. Arc, I, p. 122, Tab. xvii. Fig. 2, and 

 PI. xix, Figs. 2 to 4.) Numerous leaves of the different forms represent- 

 ing this species and other varieties are preserved on our specimens. 

 The smallest leaf is 22 millimeters long and 14 millimeters broad, ovate, 

 lanceolate-pointed, narrowed by a curve to the petiole. This form has 

 generally the borders marked by one or two obtuse teeth above 

 the middle. The more general form of the leaves is broadly ovate, ab- 

 ruptly narrowed to an obtuse point, with the base rounded to a long 

 petiole and the borders entire, generally equilateral, but sometimes more 

 enlarged on one side. The nervation is the same as marked by the au- 

 thor, loc. cit. It has three primary nerves, the lateral ones ascending to 

 three-quarters of the leaves, curving inward and there anastomosing 

 with branches of the medial nerve. But when the leaves enlarge, they 

 bear at the base a pair of thinner marginal veins, which in still broader 

 leaves become as thick as the primary lateral ones, ascend in the same 

 direction, and give the leaf the same appearance as that of some leaves 

 of Fopidus arctica. Our specimens have branches of the same species, 

 bearing x)etioles of leaves and spines ; also pieces of bark with oval scars 

 of spines close to each other, and small oval seeds or nutlets, surrounded 

 upward with an oval, flattened border, like a narrow wing. The areo- 

 lation is rendered distinct by the erosion of the parenchytna of some of 

 our leaves. 



