LE8QUEREUX.1 PALEONTOLOGY ^LIGNITIC FLORA SPECIES. 399 



and with few branches, craspedodrome, their points and those of their 

 divisions entering short distant teeth. Except that on this leaf the 

 denticuhition of the borders is simple and the teeth equal or of a same 

 order, while, as represented by Goppert, in Fl. v. Schossnitz, (p. 17, PI. 

 viii, Figs. 4-5,) there are generally two or three small teeth between the 

 larger ones, which only are entered by the veins, there is not any ap- 

 preciable difference between the American and the European leaves. 

 That this difference is not a specific one is seen by Fig. 5, (loc. cit.,) whose 

 teeth are mostly equal and of the same order. 

 Hahitat. — Sand Creek, Colorado, A. B. Maricine. 



QuERCUS Cleburni sp. nov. 



Leaf oblong, oval, obtusely-pointed, distinctly obtusely-dentate, taper- 

 ing to the base and decurring to the short petiole, penninerve ; medial 

 nerve thick ; secondary veins at a very open angle of divergence or 

 nearly at right angle to the middle nerve, obsolete. This form is closely 

 related to Q. urophylla, Ung. (Fl. v. Sotzka, p. 33, PI. ix. Fig. 9,) differing 

 by smaller, more regular teeth. The leaf is unequilateral, as in Fig. 9, (loc. 

 cit.,) and on one side the divisions or denticulation of the borders are 

 smaller and more regular than on the other. 



Hahitat. — Black Butte. 



FiCUS TLLl^FOLIA, Al. Br. 



The species is common enough in the Colorado basin. Specimens 

 from Sand Creek are covered with fragments of its large leaves of the 

 same type and as well characterized as those figured by Heer, (Fl. Tert. 

 Helv., Ill, PI. cxlii. Fig. 25.) One of the fragments indicates a leaf of 18 

 centimeters long and 14 centimeters wide. Specimens from Golden rep- 

 resent also this species, but in smaller leaves. 



Habitat. — The whole Lignitic basin, common. 



FiCUS PLANICOSTATA, Lsqx., var. GOLDIANA. 



This form differs from the normal one, so abundant at Black Butte, 

 by narrower, more gradually acuminate leaves, and by the primary 

 veins thin and not flattened. This variety is closely related to the 

 leaves described by Saporta in his Fl. Foss. de Sezanne, (p. 400, PI. xii, 

 Figs. 6-7) as Sterculia variaMlis. Fig. 6 represents a leaf slightly un- 

 equilateral, a character not remarked in the leaves of Golden. The 

 author says that F. MicJieloti of Watelet is apparently the same species. 

 The normal form of F. planicostata is different by its broad, flat primary 

 nerves and its coarser areolation. Except this, the essential characters 

 are the same. 



Habitat. — Golden. The variety only is found at this place ; the nor- 

 mal form most abundant at Black Butte has been discovered above a 

 bituminous shale of Coal Creek, Colorado, by W. H. Holmes. 



Ficus zizYPHOiDES, sp. nov. 



A small oval, obtuse (I) (point destroyed,) entire, thick-nerved leaf, 

 palmately 5-nerved ; lower pair of veins marginal ; second pair turned 

 upward and branching j middle nerve thick, simple, with close, thick 

 fibrillfe iu right angle to the veius ; petiole thick, apparently long. The 

 lateral veins branch twice, the marginal ones many times, in short 

 divisions, curving along the borders in festoons. The leaf is wrinkled 

 across by the pressure of the uervilles; if representing a Ficus it belongs 

 to the section of the Populinece. The petiole is thick from the base of 

 the leaf downward. 



Habitat. — Golden. 



