FLOEA OF THE GREEN ElVER GROUP. 189 



tertiary veinlets as flexuous and reticulate. The leaf is nearly of the same 

 size, 2 centimeters in diameter both ways. 



ifa5.— Florissant. U. S. Geol. Expl. Dr. F. V. Ilayden. 



ZIZYPHUS, Mm. 



" U. S. Geol. Rep.," vii, p. 275. 



Zizyphus ciuuauioiuoides, Lesqx. 

 /6id, p. 277, pi. lii, fig8.7,8. 



RHAMNUS, Linn. 

 Ibid., p. 278. 



Rhaiunus oleasfoliu.s, sp. nov. 



Plate XXXVni, Fig. 14. 



Leaves thick, oblong-lanceolate, narrowed at base, blunt at the apex ; secondary 

 veins thick, at an acute angle of divergence, curving close to the borders. 



The leaf, 6i centimeters long, 18 millimeters broad, has the primary 

 and secondary nerves thick, but no trace of nervilles ; the lateral veins 

 are nearly straight to near the borders and abruptly curve in reaching 

 them, appearing to join the margin by their ends. The same character of 

 nervation is remarked in R. marginatus, Lesqx., "Trans. Phil. Soc," vol. 

 xiii, p. 420, pi. xxii, figs, 3-5, which, however, differs much in the form 

 and size of the leaves. 



Hab. — Florissant. Princeton Museum, No. 687. 



Bhamuus notatus?, Sap. 



Plate XXXVIII, Fig. 15. 

 Sap., "Et.," iii, 1, p. 108, pi. xi, fig. 5. 



Leaves subcoriaceous, very short-petioled, entire or slightly undulate in the 

 upper part, round ovate, obtusely pointed ; lateral nerves 6 to 7 pairs, parallel, curved ; 

 nervilles oblique, transversely reticulate. 



This leaf is, in its form and size, like a counterpart of that of Saporta, 

 I. c. It is also rounded at base to a very short petiole, curved toward the 

 apex and there obscurely undulate or crenulate. The lower secondary 

 veins are opposite, three pairs. In the figure of the French author all 

 the veins are alternate except the basilar ones; but there is also no trace 

 of nervilles visible as upon the specimens of Florissant. 



Hah. — Florissant. Princeton Museum, No. 643. 



