330

B. N. A. BOUNDARY COMMISSION.

Dicolyledones.

Populus Richardsoni —Heer, Porcupine Creek.—This fine species of Poplar , des-cribed, by Heer from Mackenzie River and Greenland , is represented by a fewfragments only in these collections.

Salix Rakana? Heer, Great Valley.—This species occurs at Mackenzie Riverand in Greenland . A few leaves appear referable to it but not with certainty.

Corylus rostrata —Ait.—Leaves not distinguishable from those of the commonbeaked Hazel, occur at Porcupine Creek. This species is also recorded by Newberryfrom the Port Union Group.

C. Americana. —Walt., Porcupine Creek.—This also is a recent species and is cre-dited by both Newberry and Lesquereux to the Fort Union Group. Thus both ourAmerican Hazels occur in these deposits; and a still finer species, C. MacQuarrii,Heer, is found at Mackenzie River and in the Fort Union beds.

Platanus heterophyllus, Newberry.—Wood End, loose, but no doubt, from theLignite Tertiary formation. The species is found in the Fort Union group.

Diospyros, sp.—To this genus I refer a few imperfect leaves from PorcupineCreek, but cannot certainly identify them with any of the species described fromother parts of these formations.

Sapindes affinis, Newberry.—Bad Lands, Woody Mountain. This species isfound also in the Fort Union Beds.

Rhamncs, sp.—Great Valley, 345 mile point. A single leaf, wanting part of thetip and base, but otherwise very perfect. It corresponds, as far as preserved, with R.Eridturi of linger, which occurs in Greenland , but it may be one of the species des-cribed by Lesquereux from the Lignite Tertiary of the United States .

Riiamxcs concinnus.— , Newberry.—Porcupine Creek. This species also occurs inthe Fort Union group.

Carya antiquorum. —Newberry, Porcupine Creek.—This species is also found inthe Fort Union group.

Juglans cinerea ? Porcupine Creek — A leaf so near this species, that I hesitateto separate it. It resembles, however, •/. bilinica Ung.

Viburnum pubescens —Pursh, Porcupine Creek—Either this species or a large leafof V. Innceolatn, Newberry, from Fort Union Group.

Other leaves in this collection may represent a species of Primus, a Thulictrumdifferent from our modern American species, and several other plants, but not deter-minable without more material.

Aesculus antiques, N.S. (Figs. 8 and 9.)-—Pericarp lj inches in length and 1 inchin breadth ; obovate, truncate at base, regularly rounded above, with several strongwoody spines on the upper half. Seed of similar form but smooth or with a fewtortuous impressions. Bad Lands west of Woody Mountain. This fruit is almostcertainly an Aesculus , but with characters intermediate in some respects between theHorse Cliesnut and the American Buck-eye.

Thafa Borealis? —Heer, (Fig. 10.)—A few obscure prints seem to indicate aspecies of this genus, which may be identical with the above species described byHeer from Alaska . They are associated with stems and linear submerged leaves whichmay have belonged to this plant, arid similar to those described by Heer from Alaska .In one of my specimens, the two lateral tubercles seen in Heer’s figures seem to beproduced into spines, making six in all. The specimens are from Bad Lands, west ofWoody Mountain, and there is an obscure example of the same form from GreatValley.

Carpolithes, sp.—An ovate fruit of the form and size of C. lunatus, of Newberry,but not distinctly striated. Bad Lands, west of Woody Mt.

The following are the species catalogued by Heer, from Richardson’s collectionson the Mackenzie. As they belong to this region, they are given here for compa-rison :—