Ulmus. URTICINEZ. 15 
represented by larger, five-lobed, minutely denticulate leaves, is described 
by Unger, Iconog., p. 44, Pl. XX. Fig. 28, under the name of L. acerifolium, 
as a small trilobate, more deeply lobate, and long petioled leaf: In any 
case the presence of a Liquidambar in the upper tertiary of California 
is explainable either by the present geographical Cistribution of the genus, 
which has representatives in Japan and China, or by geological relation 
or derivation, as Z. Luropeum. One of the most widely distributed species 
of the Miocene of Europe, especially abundant at Ciningen, even reccg- 
nized in the Miocene of Italy, has been described by Heer from speci- 
mens from Alaska. 
Habitat. — Chalk Bluffs, Nevada County, California. Voy’s Collection. 
URTICINEA. 
ULMUS. 
Ulmus Californica, sp. nov. 
Dd a RE 7 | a aR ARN gS ASR 6 aa 
Leaves small, subcoriaceous, narrowly ovate-lanceolate, acuminate, rounded to the slightly 
unequilateral base; borders irregularly denticulate; secondary nerves parallel, 
numerous, more open towards the base, craspedodrome. 
The collection has numerous leaves of the same species from two 
localities, those from Table Mountain representing leaves generally 
smaller than those of the Chalk Bluffs. Fig. 2 is one of them, varying 
in size from three and a half to seven centimeters long, and _propor- 
tionally broad. The essential characters are, however, identical. The 
border teeth are smaller, but irregular, those entered by the secondary 
nerves being a little stronger, all, however, generally turned outside. The 
secondary veins, thin at their points, are at a more or less open angle 
of divergence, according to the width of the leaves, and these, slightly 
unequal at the base and rounded to the petiole, are gradually narrowed 
from the middle upward into a long acumen. The characters of the 
leaves of Udnus are easily recognized in their generic relation; but the 
species are less satisfactorily separated. In this form, however, they seen. 
distinct from those of all the fossil species described, especially by the 
constantly narrow shape, the somewhat thick consistence of the lamine, 
and the small teeth turned outside. Except for this peculiar denticula- 
