14 DESCRIPTIONS OF FOSSIL PLANTS. 



conjunction with the lateral ones; and the borders being all totally 

 erased so that their characters can not be observed except at the lower 

 holders of the left lobe, which is serrate. Beer describes the leaves as 

 coriaceous. These specimens show them to be thin and pellucid, an 

 appearance, however, which may have been produced by maceration. 

 In comparing this leaf with that of Acer dimorphum, one can but find 

 between them a remarkable analogy of characters, the lower lateral 

 lobes, though comparatively very small in PI. ix, tig. 1, being marked 

 on the lower side each by a few small teeth or like serrate, while the 

 nervation of the upper lateral lobe is about of the same character. 

 Two specimens; Museum number, 2504. 



Liquidambar europeum Al. Br. 



One specimen; Museum number, 2503. 

 Acacia oregoniana, n. gp. Plate v, lig. 4. 



Legume long pedunculate, 8 em long, U"" broad, linear, narrowed at 

 one end to a long pedicel, obliquely rounded at the other to a pointed 

 one-sided beak; bearing 8 to 9 small oval seeds more or less distaur, 

 joined to the upper borders by simple filaments; borders, narrow; 

 legume, flattened by compression, membranous. 



The legume is larger thau any of those figured by lleer (PI. Tert. 

 Ilelw, Pis. cxxxix and cxl), except the fragment of A. microphylla, PI. 

 cxL, tig. s. Its form is that of Cercis occidentalis, but the borders are uot 

 winged by a membrane. 



Two specimens; Museum number, 2412. 



Acer Bendirei, u. si). Plate v, fig. 5, vi, fig. 1, vn, fig. 1, vili, fig. 1. Jar trilobaium 

 productum Al. Br. Lesquereax in Cret. and Tert. Fl.,p. 25:5, PI. i.ix, figs. 1-4. 



Leaves large, palmately trilobate, cordate or round auricled at base 

 with a very long, thick petiole; lobes long and comparatively narrow, 

 the medial twice as long as the lateral ones, which are erect, at a very 

 acute angle of divergence or even curved inward, dentate from the 

 base; teeth either large and long, sharply acuminate, or shorter, turned 

 outward and merely pointed. 



The leaf, tig, 1, PJ. vr, has no auncie at its base, and the teeth of the 

 lobes are large and sharply acuminate; thus, it seems at first to belong 

 toa marked \ariety or a different species. But that of tig. 5, PI. v, has 

 some of the teeth also sharply acuminate, and at base a short auricle 

 or rather a prolongation of the lamina lower than the point of union of 

 the primary nerves. The petiole is thick, inflated, and split at base by 

 compression. 



Acer trilobatum, var. production, Al. Br., has the medial lobe nearly 

 as long as in those of this species, which evidently differs by the base 

 of the leaves, cordate or aurieulate, by the narrow very oblique lateral 

 lobes sometimes curved inward, and the sharply acuminate teeth. 

 Acer Heerii (Mass. Flor. Foss., p. 345, PI. xvi, and xvn), a synonym of 

 A. trUobatum productum Al. Br., is represented with leaves sometimes 



