368 



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

 the Gehrung's 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. Eayden. 



12. FlCUS IRREGULARIS, Lsqx. 



This species was published under the name of TJlmus ? irregularis, in 

 Dr. F. V. 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 

 Eock 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. 



Haeitat.— Point of Eocks, Dr. F. Y. Hayden. 



13. LArRiJS (Persea) pr^stans ?, sp. nov. 



Leaf coriaceous, large, broadly lanceolate or elliptical, narrowed 

 ui)ward to an acute ])oint, and downward in the same degree to a thick, 

 short petiole ; middle nerve thick ; secondary veins strong, parallel ; 

 nervilles distinct ; areolation very small, lightly marked. 



The very fine and well-preserved leaf is sixteen centimeters long from 

 the base of the thick petiole, which is one centimeter long, five centi- 

 meters broad in the middle, where it is the widest, and has thick sec- 

 ondary veins regularly branching, with distinct nervilles and the areo- 

 lation of a Laurus. The foliaceous substance of the lower part of the 

 leaf is destroyed, but the middle thick nerve and the petiole are pre- 

 served, as well as the outline-borders. By its nervation, this species is 

 allied to Per sea speciosa, Heer, diifering by the form of the leaf and the 

 thick middle nerve. By these two last characters, it is comparable to 

 Laurus princeps, Heer (Pl. Tert. Helv., IE, p. 77, PI. XO, figs. 17-20), 

 differing, however, by the secondary veins somewhat thicker and slightly 

 more distant. It is most closely related to the present Laurus Canarieiisis, 

 Sm. 



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



14. YlBURNUM ROTUNDIFOLIUM, Sp. UOV. 



Leaf nearly round, small, surrounded by a black border, slightly and 

 distantly denticulate by extension of the borders at the point of contact 

 of the secondary veins and of their branches, all craspedodrome; sec- 

 ondary veins open, diverging fifty to sixty degrees, equidistant, parallel, 

 the two lower pairs ramified, the upi^er ones only forking near the bor- 

 ders ; areolation distinct, from parallel distant fibrillse, branching and 

 anastomosing in large equilateral meshes 



The black borders of the leaves, the general characters of nervation, 

 and the facies are the same as in the other species of Viburnum pub- 

 lished from Black Butte. This leaf differs especially by its nearly round 

 form, the base rounded to the petiole, the secondary veins more open, 

 and especially the very small, slightly-marked teeth of the borders. But 

 for this last character, this leaf could be referred to Viburniim platanoides, 

 Lsqx., as represented by the small leaf of PI. XXXVIII, fig. 10, of the 



