DESCRIPTION OF SPECIES— MORE^. 203 



to a point, a character which is not, however, ascertained, the point of all 

 the specimens being destroyed. Nor can I take into consideration the 

 petiole, of which I find no fragment. Hence, though great the affinity 

 appears to be, these leaves may represent another species, even be referable 

 to another genus. The Flora of Sdzanne has, under the name of Sterculia 

 vai-iabills, Sap. (p. 400, pi. xii, figs. 6 and 7), two leaves which 'resemble those 

 figured here by the shape and the principal nervation. They differ, however, 

 by the distribution of the lateral veins, which do not reach close to the 

 borders, but follow them in double festoons. 

 Habitat. — Golden, Colorado. 



Ficus tilisefolia, AI. Br. 



Plate XXXII, Figs. 1, 2, 2 a, 3 ; Plate LXIII, Fig. 8. 



I'icus tiUwfoUa, Heer, Fl. Tert. He] v., ii, p. 68, pi. Ixssiii, figs. 3-12; Isxxiv, figs. 1-6; Issxv, fig. 14 ; iii, 

 p. 133, pi. cslii, fig. 25; clii, fig. 14. — Ung., Sillog., i, p. 14,i)l. vi.fig. 2.— Sisui., Mater., p. 

 436, pi. xvii, fig. 5.— Ett., Foss. Fl. v.Bil., p. 80,pl. xxv.figs. 4,5, 10(?).-Heer, Mioc. Bait., 

 Fl., 11. 74, pi. sxi, fig. 12.— Gaud. & Strozzi, Feuilles Foss., p. 34, pi. xii, fig. 11. — Schp., 

 Pal. V^gdt., ii, p. 746.— Lesqx., Anuual Report, 1871, pp. 287, 298, 299; Supplement, pp. 12, 

 16; Annual Reports, 1872, pp. 375, 393; 1873, p. 399; 1874, p. 304. 



TiJia mutabilis, Goepp., Palaaout., ii, \>\. xxxvii, fig. 1. 



Tilia prisca, Al. Br. in Ung., Synops., p. 234. 



Cordial tiUwfolia, Al. Br. in Bronn., Jalirb., 1845, p. 170. 



Acer Beckerianiim, Goepp., Palseont., ii, p. 279, pi. xxxvii, fig. 2 c. 



Dombeyopsis tiUwfolia, Ung., Gen. et Sp., p. 447 ; Fobs. Fl. v. Sotzka, p. 45, pi. xxv, figs. 1-5. — Goepp., 

 loc. cit., pi. xxxvi, fig. 3 (?). 



Dombeyopsis grandifolia, Ung., Gen. et Sp., p. 447; Foss. Fl. v. Sotzka, pi. xxvi, figs. 1,2. — Goepp., Uc. 

 cit, p. 22, pi. V, fig. 2 6. 



Dombeyopsis sidcefoHa, Ung., Gen. et Sp., p. 448. 



Dombeyopsis lobalaf, Ung., loc. cit., p. 447. 



Dombeyopsis aqiiaUfolia?, Goepp., Palaiont., p. 278, pi. xxxvi, fig. 4, xxxvii, fig. 2 a. — Lesqx., Supplement 

 to Annual Report, 1871, p. 10. 



Leaves of various sizes, generally very large, coriaceous, entire, broadly oval or nearly round, 

 slightly abruptly pointed, more or less inequilateral and cordate at tbe base; nervation thick, coarse, 

 camptodrome. 



The species described under so many different names in most of the Euro- 

 pean Tertiary floras is as widely represented in the Tertiary formations of North 

 America, and also as very variable, if not in its characters, at least in the size 

 of the leaves, as it is in Europe. Most of the specimens representing it from 

 the Lower Lignitic of the Rocky Mountains are fragments of very large leaves, 

 like those figured in our plates, none of them being found in the whole.* In 



* I have lately received, by a communication from Mr. George Hadden, from Coal Creek, Colorado, a 

 fine specimen of this species, representing a whole leaf, except the mere poiut. It is more than fourteen 

 centimeters long, eleven centimeters broad, cordate and inequilateral at the base, with a short, thick 

 petiole, enlarging downward, two and a half millimeters thick at the base of the leaf, and four millime- 

 ters at the point where it is broken two centimeters below its poiut of attachment. It has all the char- 

 acters of the species: form of leaf nearly round, nervation, rough surface, etc. 



