16 FOSSIL FLORA OF THE SIERRA NEVADA, 
tion, and for the longer acumen of the leaves, they are similar to those 
of the living Udnus alata, Michx., a species frequently found along the 
streams, especially in the South, its range being from Middle Ohio to 
Florida, 
Habitat. — Chalk Bluffs and Table Mountain, California. Voy’s Collec- 
tion. 
Ulmus pseudo-fulva, sp. nov. 
Pi. IV. Fig. 8. 
Leaves large, ovate-lanceolate, taper-pointed, doubly dentate on the borders, cordate and 
equilateral at the base ; lateral nerves open, especially near the base, distant, com- 
paratively thin, like the nervilles, but distinct. 
Comparing this leaf to those of the former species, the essential differ- 
ences remarked are, the larger size, the larger teeth of the borders, den- 
tate on the back, and the thinner nervation. The leaves are also merely 
pointed, even obtusely so, and cordate at the base. The likeness of this 
leaf to those of the present U. fulva, Michx., the slippery elm, is so great, 
that but for the less acuminate point, the cordate base, and an appar- 
ently less coarse texture, identity of species should be acknowledged. If 
there were many specimens for comparison, these differences might be 
recognized as merely individual. As it is, I consider this species as the 
original slightly deviating form of U. fulva. 
Habitat. — Chalk Bluffs, California. Professor J. D, Whitney’s Collection. 
Ulmus affinis, sp. nov. 
Pl. IV. Fags, 4, 2. 
Leaves of medium size, long-petioled, cuneate or rounded to the base, ovate, lanceolate- 
acuminate ; borders doubly serrate ; lateral nerves very close. 
The long petiole, the sharp serrature of the borders, with primary teeth 
turned upwards, and only a short intermediate one, especially the close, 
numerous secondary nerves, scarcely curving in passing up to the teeth, 
separate the leaf (Fig. 4) as a distinct species. Though the fragment 
(Fig. 5) is from the same locality, its characters are not equally definite, 
the borders being: slightly more obtusely and irregularly doubly serrate. 
The unequilateral base is of no account as character of a leaf of Udmus, 
and as the lateral veins are close, the areolation and the nervation the 
