DESCRIPTION OF SPECIES— AMPELIDEtE. 241 



of our fig. 6, and of course the variable characters, appreciable in oilier leaves 

 of the same species, may be only hypothetically considered. This species may 

 be a mere variety of the former; the consistence of tho leaves being the same, 

 as well as its habitat. 



Habitat. — Black Buttes, Wyoming; not rare. 



VITIS, Linn. 

 Titis Olriki, Heer. 



Plate XLI, Fig. 8. 



ntie Olriki, Heer, Fl. Foss. Arct., p. 120, pi. xlviii, fig. 1.— Lesqk., Supplement to Annual Report, 1871, 

 pp. 10, 12. 



Leaf large, cordate, narrowing upward into an angular point ; obscurely lobed ; borders dentate. 



In comparing this leaf with the well-preserved and beautiful one figured 

 by Heer, it is scarcely possible to doubt that both represent the same species. 

 The transverse bar joining the principal lateral veins at the base of the leaf 

 of Greenland is visibly marked in our figure, as also the slight expansion of 

 the lamina of both these leaves at the end of the primary lateral nerves, an 

 extension which shows a tendency to lobes, which upon these leaves are 

 rather by five than by three. The only diiferences which can be noticed 

 are the less numerous and less distinct teeth of the borders in the American 

 leaves, and also the angular rather than the acuminate point. The somewhat 

 greater distance of the first pair of secondary nerves from the base of the 

 principal ones cannot be counted as a difference, for it is the same between 

 the leaves of the former species, whose nervation is similar. 



Habitat. — Raton Mountains, New Mexico; Evanston, Wyoming {Dr. 



F. V. Hayden). 



Titis sparsa, sp. nov. 



Plate LX, Fig. 24. 



Seeds cordiform, narrowed to an obtuse point from the enlarged base, seven millimeters long, five 

 millimeters broad, half-round or convex on one side, flattened and ridged in the middle on the other, 

 smooth. 



These seeds are larger than those of Vitis Hookeri, described by Heer 

 in the Fossil Flora of Bovey Tracy (Phil. Trans., 1862, p. 1070, pl.lxix, figs. 

 27-29), but of an analogous form, and are evidently referable to Vitis or 

 Cissus. 



Habitat. — Black Buttes, Wyoming, in connection or rather in the same 

 bank of shaly sandstone, where leaves of Vitis tricuspidata are of frequent 

 occurrence. 



16 T F 



