224 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLOEA. 



of fig. 1 is broken; those of figs. 2 and 3 aie short, though apparentljjire- 

 served in their whole length. The longest petioles of the leaves of the 

 present V. dfritatum, L., are not more than half that of fig. 4. As seen in 

 comparing fig. 5 and fig. 1, the size of the leaves is extremely variable. 



By the mode of division of the borders or of the teeth, this species 

 resembles V. dentatum; but its nervation is like that ol' T' lantanoides, 

 Michx., the veins and the borders being apparently covered by a thick coating 

 of vellosity, which by fossilization gives them the black color as remarked 

 above. The cuneate base is, however, a character not remarked upon any 

 of the allied living American species, except in a less degree in V. elUpticvm 

 of Oregon. It is quite distinct in T*. erosum, Thb., of Japan, whose leaves, 

 as large as those of the ibssil species, are ovate, lanceolate-acum'nate, and 

 have the border teeth of a different character. 



Habitat. — Black Buttes, Wyoming, very abundant ; found also at Point 

 of Rocks, Wyoming {Wm. Clebuni); Golden, Colorado, where it is very rare. 



Viburnuni platan oides, Lesqx 



Plate XXXVIII, Figs. 8, 9. • 



V%})m-mim. platanoides, Lesqx., Auaual Report, 1874, i>. 1514. 



Leaves large, angular, tapering upward from the cnlaiged middle, rounded or truncate to the 

 petiole; borders equally dentate; nervation coarse and thick, craspedodrome. 



The facies of these leaves is Platanoid ; the middle vein is thick, the 

 lateral veins proportionally so, joining the midrib at or quite near the border 

 base of the leaves, at an angle of divergence of 40° to 50°, nearly all parallel, 

 the lowest ones slightly more prolonged to the borders into an indistinctly 

 marked lobe ; all branching more or less, and entering the points of the teeth, 

 either directly or by their divisions. Though somewhat similar to those of 

 Platanus aceroides^ Heer, these leaves are of the same type as those of the 

 former species, differing by the obtuse or truncate base, the thick, less 

 numerous, secondary nerves, and the broadly cuneate points. The borders 

 are not blackened, the consistence still thicker, and the surface very coarsely 

 furrowed by the veins and strong, distant nervilles, which are more generally- 

 divided in the middle. 



Habitat. — Black Buttes, Wyoming, in the burned bed where the remains 

 of the Saurian Agathaumas sylvesfris, Cope, were found, fragments of these 

 leaves being glued to the bones. I considered the first found as referable to 

 Plntanus aceroides, their borders and outline being destroyed and the nerva- 

 tion only discernible. 



