304 GEOLOGICAL SUEVEY OF THE TEREITOEIES. 



19. FiCUS PLA.NICOSTATA, Lsqr. 



Dr. F. Y. Hayden's Eeport on the Geol. Survev of tbe Terr. 1872, p. 

 393. 



A small leaf in a perfect state of preservation represents this spe- 

 cies very common at Black Butte. It is easily recognized by the broadly 

 ovate, thickish, entire leaf, slightly pointed or obtuee, rounded or sub- 

 cordate at base, short-petioled, three-nerved from the top of the petiole, 

 &c. 



Habitat. — Point of Eocks, Wm. Cleburn. 



20. Ficus TiLi^FOLiA, Heer. 



Like the former, it has been described previously in Dr. F. Y. Hay- 

 den's Eeport for 1871, j). 287, from specimens of Washakie station ; 

 mentioned in supplement to this report, p. 12, from Evanston 5 p. 6, 

 from Placiere anthracite ; in same report, for 1872, p. 375, from above 

 the Gehrungs coal, near Colorado City ; and p. 393, from Black Butte 

 station. We have also specimens from Golden and other localities ; for 

 here, as in the Miocene of Europe, this fine species, so easily identified, 

 is distributed through the whole thickness of the Lignitic, excepting, 

 however, the upper stage, that of the Green Eiver group, where it has 

 not been found as yet. I have figured it from specimens of Point of 

 Eocks, not merely because it is there clearly represented, but to show 

 more evidently the relation of this locality with the Tertiary Lignitic. 



Habitat. — Point of Eocks, Br. F. V. Hayden. 



21. Ficus irregularis, Lsqx. 



This species was published under the name of Ulmus 1 irregularis, in 

 Dr. F. Y. Hayden's Eeport for 1872 (p. 378), the generic reference being 

 then uncertain. Numerous specimens obtained later from Black Butte, 

 where the species is common, shows a thick inflated leaf-stalk, a char- 

 acter which indicates the relation to Ficus. The specimen of Point of 

 Eocks is like the counterpart of one already engraved from Black Butte 

 specimens; the identity of characters is unmistakable, and therefore it 

 was figured also as another record of identity of the flora of both local- 

 ities. 



Habitat. — Point of Eocks, Dr. F. V. Hayden. 



22. TRAPA"? MICEOPHYLLA, Sp. MOV. 



Leaves small, round, or broadly oval, obtuse, rounded to a short peti- 

 ole, with borders denticulate from below the middle, three-nerved from 

 the top of the petiole, or irregularly pinnately nerved ; lateral veins at 

 an acute angle of divergence, fifteen to twenty degrees, flexuous, with 

 dichotomous branches, all craspedodrome ; areolation by subdivision at 

 right angle, polygonal, distinct. 



These leaves vary in size from a little more than one centimeter long 

 and nearly as brdad to about two and a half centimeters long and nearly 

 two centimeters broad. They are generally oval-obtuse, somewhat en- 

 larged toward the round point ; the borders are minutely dentate except 

 at and near the base, rounded to a comparatively long and slender peti- 

 ole, the only one of the leaves where it is preserved being eighteen milli- 

 meters long, and its petiole nine millimeters. The areolation is peculiar, 

 in square or polygonal areolae, formed by close, thick nervilles, anasto- 

 mosing with veinlets parallel to the veins and their divisions, the areola- 

 tion being clearly defined, and the parietes as thick as the veins. The 

 same kind of areolation is remarked upon the lower surface of the leaves 



