GEOLOGICAL SUEVEY OF THE TEEEITOEIES. 293 



like Fagus CastanemfoUa, or Fagus Atlantica, Ting. This casual devia- 

 tion of simple uervation is often marked in species of this genus, and 

 our leaf, having the borders entire except in the upper part, where they 

 are merely undulate, or scarcely toothed, is referable to this species. 

 The secondary veins are more distant than in any other fossil species 

 of this genus. 



Betula (!) CAUDATA, (1) Gopp. Two fragments of large leaves of this 

 genus, whose upper part only is preserved. Their form is ovate-lance- 

 olate, long pointed, of the same size and of the same nervation as the 

 leaf represented under this name in Gopp., Schossnitz, Fl., p. 10, El. iii, 

 'Fig. 5. But the exact form of the teeth of the borders is not well 

 recognizable, and therefore the identity of our leaves with the European 

 species is not ascertainable. 



Betula Stevensonii, sp. nov. Leaves small, no more than 2 

 inches long, ovate or broadly ovate, tapering to a short point, rounded 

 cordate at base, with borders abruptly curved downward to the short 

 (1 centimeter long) petiole, distantly and simply dentate from near the 

 base to the point; medial nerve distinct and narrow; secondary veins 

 opposite or alternate, five to seven pairs, (angle of divergence, 40° to 50°,) 

 passing like their branches to the point of the teeth; veinlets well 

 marked, perpendicular to the secondary veins. A true Betula, repre- 

 sented by many specimens, and differing from all the known fossil 

 species by its abruptly rounded base. The secondary veins are not as 

 straight as in our living American species, from which it differs also by 

 the simply toothed or serrate borders. Eelated to Betula primceva, Web., 

 (Pal., vol. 4, p. 21, PI. V, Figs. 4 and 5.) 



Andromeda Ge.atana, Heer. Our specimens represent this species 

 ■with the borders slightly more curved outward in reaching the petiole, 

 which is a little shorter. The essential nervation is the same, the areo- 

 lation obsolete. One of our specimens bears a branch with buds, just 

 like the one figured by Heer in his Foss. Fl. of Vancouver Island, PI. 1, 

 Fig. 9 1). 



DiospiROS lancifolta, Lsqx. IsTumerous leaves, varying in width 

 from 1 to IJ inches, i)roportionally long, lanceolate-pointed, tapering 

 downward to the petiole. The substance of the leaves, transformed in 

 a pellicle of coal, is thick or coriaceous, nervation distinct, secondary 

 veins running along the borders, as marked in the figure given of this 

 species, by Heer, in Fl. Alas., PI. iii, Fig. 12. The intermediate veinlets 

 are very thin, the areolation still smaller, but of the same type as in the 

 figure loc. cit. The size of the leaves is variable, generally smaller than 

 the leaf of this species from Vancouver, even as small as that of leaves 

 of Andromeda Grayana, which these diminutive forms resemble. 



CoRNUS Studeri, Heer, (Fl. Ter. Helv., HI., p. 27, PI. cv. Figs. 18-21.) 

 A large leaf, of which the base is destroyed, but whose form and pecu- 

 liar nervation are in concordance with the characters of this species. 

 Our leaf is similar to figure 18 of Heer's, loc. cit. 



Acer trilobatum, A1. Br. A broken leaf, whose outline is mostly 

 destroyed. The substance of the leaf is thin; the nervation of the same 

 type as in Acer trilobatum var. productimi, Heer; the lateral lobes 

 appear short and obtuse. 



Ehus Evansii, sp. nov. Two entire leaves of this species and many 

 fragments. They are related to those of Ehus Meriani, Heer, (Fl. Ter. 

 Helv, III., p. 82, PI. cxxvi. Fig. 5 — 11,) being, however, shorter and pro- 

 portionally broader, more distinctly denticulate and short-petioled. 

 The nervation is that of Fig. 7, loc. cit, which represents a leaf with 

 more distinctly serrulate borders. As the leaves of Ehus Meriani are 



