290 UNITKD STATES GEOLOGICAL SUKVEY— TERTIARY ELORA. 



MYRTIFLORJ]. 

 M Y H T A C E ^ . 



Of this family, of wiiicli a large part of (he present flora of New Hol- 

 land is composed, we have only two species whose characters seem related to 

 those of the genus Eucalyptus, as represented by fossil remains. They do 

 not appear, however, satisfactorily identified. 



EUCALYPTUS, L'Herit. 



Eucalyptus II sn r I n g i a II a ! , Ett. 



Plato LIX, Fig. 10. 



Eucalyptus Bccringiaua, Ert., H;ir. Foes. Fl., p. 84, pi. xxviii, figs. 2-25. — Heer, Flor. v. Biiinst., p. 19, \A. 



iv, tig. 14. 

 Eucalyptjs Haringiana t , Leeqx., Aumial Report, 1872, p. 400. 



Leaves linear-lanceolate to the point and to the slightly inequilateral base; secondary nerves 

 alternate, mostly simple, ascending to the point, parallel to the midrib. 



If some of the leaves figured hy the author of the Flora of Bilin have 

 the same form and size as these, that one represented by Heer in the Born- 

 staedt Flora differs by its characters, form, and nervation. I am tlierefore 

 now more uncertain in regard to the relation of this species than when I 

 described it loc. cit., when this Bornstaedt Flora was still unknown to me. 

 The nervation is somewhat like that of Grevillea species; for example, G. 

 provincialis, Sap. (lilt., i, p. 99, pi. viii, fig. 3), and still more like that of some 

 Mimosee: Prosopsis, etc. 



Habitat. — Black Buttes, Wyoming, in red baked shale 



Eucalyptus !Anicricaiia, Lesqx. 

 Plate LIX, Figs. 11, 12. 

 Eucalyptus Americana, Lesqx., Supplement to Annual Report, 1871, p. 7. 



Leaves subcoriaceous, very entire, narrowly lanceolate, gradually tapering upward from below 

 the middle into a long, narrow acumen, narrowed in the same degree to the base, sessile ; middle nerve 

 thick, enlarged .at the point of attachment ; lateral nerves oblique, straight to near the bordi is, where 

 they join a continuous marginal vein. 



These fine leaves have the nervation and shape of species of this genus. 

 They are comparable, for the nervation at least, to E. oceanica, Ung., as fig- 

 ured by Heer (Flor. Tert. Helv., pi. cliv, fig. 14). In this figure, the lateral 

 nerves are more open; but, in the species represented by the leaves of the 

 Baltic Flora of the same autiior, they are more oblique than in (hose described 

 iiere. Since 1871, the time when they were first considered, I have obtained 



