22 FOSSIL FLORA OF THE SIERRA NEVADA. 
in Fig. 3. The areolation is distinct, composed, by subdivisions of the 
nervilles, of very small, round, polygonal meshes. The figure given of 
this species by Heer, in his Mioc. Balt. Fl, p. 89, Pl. XV. Fig. 14, repre- 
sents merely one lobe, whose point is broken, and a narrow obtuse sinus. 
The characters of nervation, that is, the lower secondary nerves in an 
acute angle of divergence, somewhat more open for the upper ones, as 
also-the border divisions of the leaves, are exactly the same; the frag- 
ment is, however, too small for warranting a claim of identification, which, 
however, receives a degree of evidence from the presence in this flora 
of a large number of leaves of Populus Zaddachi, a species, as remarked 
formerly, also abundant in the Miocene Baltic flora. This type of Arata 
differs from all the Cretaceous congeners by the cordate base of the 
leaves. 
Habitat. —Table Mountain, Tuolumne County, California. Voy’s Collec- 
tion. 
Aralia angustiloba, sp. nov. 
Pl. V,. Pigs A, 2B: 
Leaves of medium size, coriaceous, very entire, broadly cuneate to a short petiole, enlarged 
upwards, and deeply cut in five linear narrow entire lobes ; primary nervation in three 
Jrom the base, in five by the forking of the lateral nerves, all slender and of equal 
thickness ; secondary veins open, close, equidistant, parallel, and camptodrome. 
The leaves, of a coarse, rugose, coriaceous texture, are deeply cut in 
five narrow linear lanceolate? lobes, whose point (broken) seems to be 
obtuse. They differ from those of the former described species and of 
other fossil congeners, not merely by the characters of their divisions, 
but by the close, numerous secondary nerves on a broad angle of diver- 
gence, 70°. The only species offering some points of analogy to this are 
both Araka (Platanus) digitata and A. jatropefolia, Ung. Clor. Prot.; but 
the first has the lobes much enlarged in the middle, and acuminate; the 
second has them dentate; and in both species the five palmately primary 
nerves are from the top of the petiole. 
Hobitat. — Chalk Bluffs, California. Voy’s Collection. 
