THE FLORA. 



167 



is about 14 or 15 centimeters in length and 10 

 centimeters in width, and the widest point is at 

 about one-third the length of the blade above 

 the base. It is rather broadly ovate and has a 

 distinctly undulate margin. The nervation is 

 remarkable for the very thick midrib, with 

 only two pairs of secondaries in the upper part. 



This species appears to be closely related to 

 Domheyopsis ovata, from which, however, it 

 differs in its larger size, more distinctly undu- 

 late margin, and fewer secondary branches on 

 the midrib, as well as by the joining of the upper 

 secondaries before they reach the margin. It 

 also resembles certain species of Ficits of the 

 Ficus planicostata group, yet it apparently dif- 

 fers in essential ways. 



Occurrence: Laramie formation, Cowan sta- 

 tion, 10 miles south of Denver, Colo., collected 

 by F. H. Knowlton. 



Phyllites sp. 

 Plate XIX, figure 1. 



Phyllites sp. Knowlton [nomen], U. S. Geol. Survey Bull. 

 696, p. 450, 1919. 



In the material obtained by Peale in the cut 

 on the Moffat railroad (Denver & Salt Lake) some 

 6 or 8 miles north of Golden, Colo., is the frag- 

 ment here figured. It is only the basal portion 

 of what was apparently a large leaf and shows 

 the very thick midrib and the pair of nearly as 

 strong lateral ribs, each of which is branched 

 on the outside. It is doubtful if any portion 

 of the margin is preserved. 



This specimen is so fragmentary that there 

 is little use in speculating as to its probable 

 affinity, though it is not unlike certain species 

 of Platanus, such as Platanus raynoldsii, fig- 

 ured by Lesquereux in the "Tertiary flora," 

 Plate XXVII, figure 1, but obviously it can 

 have little value beyond calling attention to 

 the fact of the presence of a large, perhaps 

 platanoid leaf in these beds. 



Occurrence : Laramie formation, cut on Mof- 

 fat railroad (Denver & Salt Lake) 6 or 8 miles 

 north of Golden, Colo., collected by A. C. 

 Peale, 1908. 



Phyllites sp. 



Plate XVr, figure 5. 



Phyllites sp. Knowlton [nomen], U. S. Geol. Survey Bull. 

 696, p. 450, 1919. 



The fragment of the tip of the small toothed 

 leaf here figured is all that was observed of 

 this form and is hardly worthy of mention 

 except to call attention to the presence of this 

 type of leaf. Its affinity is obviously uncer- 

 tain. It might be the apical portion of the 

 leaf of a maple (Acer) or a sycamore {Platanus) , 

 but it is quite impossible to decide further. 



Occurrence: Laramie formation, Marshall, 

 Colo., collected by A. C. Peale, 1908. 



Phyllites sp. 



Plate VIII, figure 5. 



Phyllites B^. Knowlton [nomen], U. S. Geol. Survey Bull. 

 696, p. 451, 1919. 



In the material from Cowan station, near 

 Denver, is the fragmentary leaf here figured. 

 It was a lanceolate leaf with a wedge-shaped 

 base and presumably an entire margin and 

 was evidently of firm texture. It was 10 centi- 

 meters or more long and 3.5 centimeters wide. 

 The nervation is strongly marked, consisting 

 of a strong midrib and probably about six 

 pairs of strong alternate secondaries at an 

 acute angle of divergence. None of the finer 

 nervation is preserved. 



This leaf has some resemblance to what has 

 been described as Ficus cowanensis, especially 

 to the leaf shown in Plate IX, figure 3, and it is 

 to be noted that they come from the same 

 locality. The latter is a larger leaf and has 

 the secondaries more numerous and at a less 

 acute angle. The fragment under discussion 

 has some suggestion of certain narrow leaves 

 of Quercus, but it is too fragmentary to be 

 certain of the reference to that genus. On the 

 whole it seems best to refrain from giving it a 

 definite designation. 



Occurrence: Laramie formation. Cowan sta- 

 tion, south of Denver, Colo., collected by 

 F. H. Knowlton, 1908. 



