206 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



and the petiole in fig. 9 is enlarged toward the base, indicating the relation 

 of these leaves to Ficus. The areolation seen npon the leaf, of Heer is of 

 the same type as that of our fig. 7, only smaller. In this fig. 7, the base is 

 equilateral; fig. 9 shows it, on the contrary, distinctly inequilateral. 



Habitat. — All the specimens have been obtained at ihe same locality — 

 Table Mountain, near Golden, Colorado, where they are mixed with Sabal 

 leaves, Piatanus Haydenii, etc. 



Ficns aiiriculata, Lesqx 



Plate XXX, Figs. 4-0. 



Ficus auriculata, Lesqx., Annual Report, 1872, pp. 379, 406.— Scbp., Pal. V6g<?t., iii, p. 595. 



Leaves rather coriaceoas, entire, ovate-lanceolate, obtusely pointed or exactly ovate in shape, 

 deeply cordate or broadly auriculate at the base ; basilar nerves in three or four pairs ; division* campto- 

 drome. 



As seen in fig. 5, which represents the more general character of these 

 leaves, three pairs of nerves come out from the base of the leaves at the top 

 of the petiole, passing in curves to the borders of the auricles. In the small 

 leaves (figs. 4 and 6), the same number of basilar veinlets are attached to the 

 petiole, and in right angle to it, indicating the same character of nervation. 

 It is, however, seen to be the same in fig. 7 of the former species, and it 

 is possible that the fragments (figs. 4 and 6) should be referred to it; 

 for, since the preparation of the plates, I have received, from other localities, 

 a number of specimens, all representing leaves of about the same size as fig. 



5, seven to nine centimeters long, five to seven centimeters broad, all deeply 

 auricled at the base, and more evidently coriaceous than those of figs. 4 and 



6, and those also of the former species. The nervation is coarse, of the same 

 character as that of Ficus planicostata, but with the nerves half-round, the 

 nervilles still thicker, closer, in right angle to the midrib, mostly simple, with 

 smaller divisions coming out in right angle, forming large, square, primary 

 meshes, whose subdivisions, somewhat obsolete, constitute very small, ultimate, 

 round-polygonal areolae. In well-preserved specimens, the point of attachment 

 of the petiole is exactly round, five millimeters in diameter, thus indicating 

 a comparatively thick petiole, and the palmately seven-divided nervation is 

 clearly seen; for all the nerves around the petiole are thick, not quite as 

 thick, however, as the upper primary ones. Most of the leaves are exactly 

 ovate, and obtuse, rarely marked at the top by a very short, abrupt point. 

 The leaves of this species, 1 hough resembling by their form those of some 



