28 SIR J. W. DAWSON ON THE FOSSIL PLANTS 
SALIX RAEANA, Heer. 
Heer, Flora Foss. Arctica. 
This species, occurring in Greenland and on the Mackenzie River, is represented by a 
few specimens in the collections from Great Valley. 
Collected by G. M. D. 
SALIX LARAMIANA, 8. N. (Plate I, Fig. 10). 
Leaf moderately large and wide, veins few, at angle of 45°, forking at an obtuse angle 
toward the margin, which is entire, surface finely reticulate. 
This species, except in its entire margin, resembles very nearly the Sevarians, Heer, 
from Alaska. It occurs in the Upper Laramie of Great Valley. 
Collected by G. M. D. 
ULMus PRÆCURSOR, S. N. (Plate II, Fig. 11). 
Leaves small, thin, inequilateral and rounded at the base. Apex acute, margin 
sinuate. Veins numerous, slightly curved, and dividing toward the margin to enter into 
the unequal serrations. 
This species is nearly related to the U. fenuinervis of Lesquereux, from Florissant, 
Colorado. It does not seem to have been found in the recognized Laramie or Fort Union 
group of the United States. 
SASSAFRAS (ARALIOPSIS) BURPEANUM, Dawson. (Plate II, Fig. 12). 
Dawson, Mesozoic Floras, Trans. Roy. Soc. Can., Vol. III. 
This leaf will be found described in the paper above cited. It is from the Upper 
Laramie of Shaganappi Point, and is named after Mr. Burpee, who aided in my explorations 
there. 
SASSAFRAS SELWYNU, Dawson. (PI. II, Fig. 13). 
Dawson, Report Geol. Survey of Canada, 1879-80. 
Leaf somewhat rough on the under side; three lobed, three ribbed, with the central 
lobe longest ; ribs and nerves strong and woody; margin entire and slightly waved; 
breadth, 4°5 centimetres ; length, 5 centimetres. The two lateral nerves diverge at an 
angle of 40° from the midrib. Each lateral rib gives off three small curved veins at its 
base, and these six strong curved veinlets which bend round and become parallel with the 
margin. Slender parallel veins are given off from the inner sides of the lateral ribs, and 
join those of the midrib up to a height of 1°5 centimetres, when the midrib gives off 6 
strong slightly curved parallel lateral veins on each side, at angles of 40°. 
This species is represented by only one well-preserved example and some fragments, 
in Dr. Selwyn’s collections from the Souris River. Its form and venation are very 
peculiar, and [ think entitle it to be referred to Sassafras with quite as much probability 
as many of the leaves from the Cretaceous referred to that genus. It is indeed very near 
to S. cretaceum, Newberry, especially the variety obtusum of Lesquereux. It is to be 
observed, however, that this common Cretaceous species has also been referred to Araliopsis. 
If a Sassafras, it is of interest as being the first representative of that genus in the Laramie 
period. 
Collected by Dr. Selwyn. 
