lbsqubbbux.] FOSSIL PLANTS FROM POINT OF ROCKS. 307 



Of this species, there is the point of a leaf, and another one nearly 

 entire, though somewhat lacerated, about two and a half centimeters 

 long, including the petiole (three millimeters), and one and a half 

 centimeters broad, oblong or Ungulate, with borders cut from the base 

 in comparatively large, pointed teeth, either simple or with small pro- 

 tuberances on the back of the largest ones ; nervation craspedodrome, 

 the secondary veins entering the large teeth, and more or less irregu- 

 larly and obscurely dividing in very thin branches, joined in the middle, 

 and forming a large, scarcely distinct areolation. By the form of the 

 leaves and the border-divisions, this species is comparable and closely 

 related to Rhus Pyrrliw, Ung., as figured in Tert. Flor. Helv. of Heer 

 (PI. CXXVI, fig. 20), which has leaves, round truncate at the base, and 

 short-petioled, as in one of our specimens. Like Rhus Pyrrhce, it is also 

 comparable to Rhus aromatica Ait., «. very common species of our pres- 

 ent flora. This has also generally doubly dentate teeth, and, in southern 

 specimens, a thickish, membranaceous consistence. 



Habitat. — Point of Eocks, Br. F. V. Hay den. 



30. JUGKLANS RHAMNOIDES, Lsqx. 



A small leaf of this species, which is not yet, however, definitively lim- 

 ited, as seen from the description in Dr. F. V. Hayden's Eeport for 1871 

 (p. 294), and which may be identical with Juglans Leconteana, Lsqx., and 

 Cornus acuminata, Newby. Though it may be of the value of the species, 

 the leaf from Point of Eocks is identical in all its characters, even 

 in its size, with some of those found in the burned beds of red shales at 

 Black Butte. 



Habitat. — Point of Eocks, Br. F. V. Rayden. 



The three following species have been sent also by M. Cleburn from 

 near the Alkali stage-station, on the Sweetwater road, about thirty 

 miles north of Green Eiver station of the Union Pacific Railroad. The 

 proprietor of the specimens did not himself visit the locality, but 

 obtained them from another party, who did not give any details on the 

 relative position of the beds where they were discovered. They repre- 

 sent three species, all new. 



The character of the leaves, as also the presence of remains of Palms 

 at the same locality, seem to indicate about the same station as that of 

 Point of Eocks or Black Butte. They are described, therefore, as of the 

 same group. 



1. Alnites uneqtjilateralis, sp. nov. 



Leaves thin, variable in size, broadly oval or ovate-pointed, rounded 

 to a short petiole ; borders creuato-serrate ,; nervation pinnate: lateral 

 veins' irregular in number and distance, curving in passing to the bor- 

 ders, at an angle of divergence of fifty to sixty degrees, and entering the 

 teeth by their ends or by small brauchlets, when they pass under the 

 teeth and follow the borders. 



These leaves vary in size from four to eight centimeters long and 

 from three to six centimeters broad, one of the sides measuring generally 

 one-fourth in width more than the other. The irregularity in the num- 

 ber of the veins is correspondingly great ; one of the leaves, the smallest 

 for example, has, on one side, five lateral veins, the lower much branched 

 outside, and on the other, ten, all simple. The largest of the leaves 

 of this species, which is represented by a number of specimens, is 

 related by form and nervation to Populus Lebrunii, Wat., which Saporta 



