DESCRIPTION OF SPECIES— TILIACB^. 259 



Grewiopsis Cleburui, Lesqz. 



Plate LXII, Fig. 12. 



Greiviopsis Clchurvi, Lesqx., Annual Report, 1874, p. 306. 



Leaves r.ather small, subcoriacenus, ovate, rounded and narrowed by an inward curve to the petiole, 

 sinuate-denticulate, palmately three-nerved from a distance above the base; primary nerves thick; 

 secondary veins two or three pairs, distant, all branching outside, with subdivisions or veinlets entering 

 the teeth; norviUes at right angle to the veins, flexuous, simple or obliquely dividing in the middle; 

 areolation obsolete. 



This leaf, about five centimeters long (the point is broken), four centi- 

 meters broad in its widest part, below the middle, is remarkably similar to 

 the two figures given by Saporta (loc. cit.) of his G. orbiculata; it is only 

 somewhat larger, its border denticulation more distinctly marked, though 

 exactly of the same character, and its base is curved inside in narrowing to 

 the petiole, and abruptly descending to it, or nearly decurrent, and not rounded. 

 These differences are, however, of so little moment, that, if this fragment had 

 been found at Sezanne, it could but have been considered as identical with 

 that of G. orbiculata. This close analogy, like that of other leaves described 

 from Black Buttes and Point of Rocks, all the species figured in pi. Ixii for 

 example, evinces the relation of the Lower Lignitic of Wyoming and Col- 

 orado to the Eocene of Europe. 



HABirAT. — Point of Rocks, Wyoming {Wm. Cleburn). 



APEIBOPSIS, Heer. 



This genus is known mostly by large capsular fruits, Jive- to sixteen-val- 

 vate, furroiDcd, bearing small round seeds, biseriate in each cell. The leaves of 

 one species only are known, and described as palmi-nerved, ivith the fnidrib 

 stronger and the lateral veins caniptodrome 



ApcibopsisI discoloi', Lesqx. 



Plate XLVI, Figs. 4-7. 



Bliamnus discoloi; Lesqx., Annual Report, 1872, p. 398. 



Leaves membranaceous, truncate, or subcordate, ovate, acute, entire, long-petioled ; midrib thick; 

 lower secondary veins opposite, all parallel, equidistant, joined by oblique simple nervilles. 



The numerous specimens which I have collected and studied at Black 

 Buttes are mostly fragmentary, but represent leaves of about the same size, 

 six to seven centimeters long, and four to five and a half broad toward the 

 base. They are all easily identified by the yellowish color of the lamina, 

 which is rather membranaceous, and the black color of the lateral nerves. 

 In some specimens, as in fig. 4, where the base of the leaf is more evidently 

 cordate, the nervation is subpalmate; but in others, like that of fig. 6, the 



