Ulmm. UKTICINK.E. 15 



represented by larger, five-lobed, minutely denticulate leaves, is described 

 by linger, Iconog., p. 44, PI. XX. Fig. 28, under the name of L. aeerifoUum, 

 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 distribution of the genus, 

 which has representatives in Japan and China, or by geological relation 

 or derivation, as L. Europeum. One of the most widely distributed species 

 of the Miocene of Europe, especially abundant at CEningen, even recog- 

 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. 



URTlCINEiE. 



ULMUS. 



Ulmus Californica, sp. nov. 



PL IV Fu/s. 1, 2. PL VI. Fig. la. 



Leaves small, svbcoriaceous, narrowly ovate-lanceolate, acuminate, rounded to the slightly 

 Km ijiii/titi nil base; borders irregularly denticulate; secondary nerves parallel, 

 numerous, more '•/>< n 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 Ulmus are easily recognized in their generic relation; but the 

 species are less satisfactorily separated. In this form, however, they seem 

 distinct from those of all the fossil species described, especially by the 

 constantly narrow shape, the somewhat thick consistence of the laminae, 

 and the small teeth turned outside. Except for this peculiar denticula- 



