MIOCENE FLORA— CALIFORNIA AND OREGON. 249 



Plat an us dissecta, Lesqx. 

 Plate LVI, Fig. 4 ; LVII, Figs. 1, 2. 

 Lesqx., "Mem. Musenui Comp. Zool." (Harvard College), vol. vi, no. 2, p. 13, pi. vii, fig. 12; x, figs. 4, 5. 



Leaves large, subcoriaceous, truncate or subcordate at base, deeply three to five- 

 lobed ; lobes lanceolate-acuminate, sharply toothed. 



The leaves are large but not larger than those of P. occidentalis, which 

 they closely resemble, differing by the narrower more acutely pointed lobes 

 at a more acute angle of divergence. They are larger and more coriaceous 

 than are generally those of P. aceroides, and especially of P. Gruillelmm, 

 with sharper teeth more turned upward. The relation of these leaves to 

 those of both P. aceroides and P. occidentalis is, however, so well-marked 

 that they seem like an intermediate form, indicating mere gradual, scarcely 

 noticeable modifications between the ancient Miocene and the present 

 living species. 



Hab. — Corral Hollow, California. 



ULMACEjE. 



ULMUS, Linn. 



Ulnius pseudo-auiericana, sp. nov. 



Plate LIV, Fig. 10. 



Leaves ovate, oblong or oval, acute or acuminate, unequal at base, sharply 

 doubly serrate; medial nerve strong, strict; secondary nerves close, parallel, straight 

 or slightly curved in traversing the blade, with a few branches near the apex, crasped- 

 odrome. 



The leaf, 9 centimeters long, 5 broad, with a short thick petiole, is 

 obliquely cut on one side at base, rounded to the other. The primary 

 teeth, much longer than the medial ones, have their sharp points curved 

 inward, and the intermediate ones are very small and obtuse. All the 

 characters of this leaf, as far as can be seen from a fossil specimen, are 

 those of the living Uhnus Americana, Linn., some leaves of which seem 

 like the original from which the figure has been made. The nervation is 

 the same; the lateral nerves, with two or three branches quite near the 

 apex, enter the intermediate teeth. The point of the leaf is broken; it 

 could easily be reconstructed as acute or rather abruptly short acuminate 

 as in most of the leaves of Ulmus Americana. 



Hab. — Bridge Creek, John Day Valley, Oregon. 



