THE FLORA. 



137 



the length of the leaf and joining the next pair 

 of secondaries, which arise high above the base; 

 other secondaries thin, at an angle of about 

 45°, considerably curved upward, campto- 

 drome, each joining the one next above; finer 

 nervation not retained. 



This species is represented by several ex- 

 amples, two of which have been figured. The 

 larger one is about 5 centimeters long and 

 nearly 2 centimeters broad ; the other is about 

 4 centimeters long and 1.5 centimeters wide. 

 It may be distinguished at once by its obovate 

 shape, narrowly wedge-shaped base, and thin 

 lower secondaries, which run up and join the 

 next pair of secondaries, the latter originating 

 near the middle of the blade. 



This species is of the type of Ficus trinervis 

 (Ward) Knowlton, F. praetrinervis Knowlton, 

 from the Vermejo formation, and F. post-triner- 

 vis of this report. From all these it differs in 

 its smaller size and more markedly obovate 

 outline. It was at one time thought that these 

 specimens might be very small, narrow leaves 

 of F. praetrinervis, but as that species is usually 

 very abundant where it occurs at all, inter- 

 mediate forms connecting the two should be 

 found, but they have not, and so F. cannoni is 

 considered as undoubtedly distinct. 



This species is named in honor of George L. 

 Cannon, of Denver, who has long been identified 

 with the study of the geology of the Denver 

 Basin. 



Occurrence : Laramie formation, Cowan sta- 

 tion, 10 miles southeast of Denver, Colo. 

 (PI. VI, fig. 3), collected by F. H. Knowlton, 

 1908; Popes Bluff, just north of Pike view, 

 Colo. (sec. 14, T. 13 S., R. 67 W.), collected 

 by A. C. Peale and M. I. Goldman, 1908. 



Ficus navicularis Cockerell. 

 Plate VI, figures 4, 5; Plate XI, figures 3-5. 



Ficus navicularis Cockerell, Am. Mus. Nat. Hist. Bull., 



vol. 24, p. 89, 1908; Torreya, vol. 9, p. 141, figs. A, 



(in text), 1909. 

 Ficus lanceolata Heer, Flora tertiaria Helvetiae, vol. 2, 



p. 62, pi. 81, figs. 2-5, 1856. [Homonym, Buchenau- 



Hamilton, 1814.] 

 Lesquereux, U. S. Geol. and Geog. Survey Terr. Ann. 



Rept. for 1871, p. 300, 1872; Tertiary flora: U. S. 



Geol.* Survey Terr. Rept., vol. 7, p. 191, pi. 28, 



figs. 1-5, 1878. [Figures 1-5 reproduced on PI. XI, 



figs. 3-5.] 



The first American specimens referred to 

 Ficus lanceolata Heer were mentioned by 



Lesquereux in 1871 [1872], having probably 

 been collected the previous year. He wrote 

 as follows of the collection of which they form 

 a part : 



Hard, shaly, fine-grained whitish sandstone. About 

 the same consistence and color as the specimens from 

 Carbon station. The precise locality is unknown, the 

 labels having been lost or forgotten. 



Most of this collection is still preserved in 

 the United States National Museum, and, 

 although it was originally stated to be from 

 an unknown locality, the next time — and in 

 fact at all subsequent times — it was mentioned 

 it was said by Lesquereux to have come from 

 the Green River formation. The nature of the 

 matrix entirely precludes the probability of 

 this being true, a view further confirmed by 

 the other species in the collection, as well as 

 by the geologic distribution subsequently 

 shown for the various species. 



Other specimens from Willow Creek, in 

 Middle Park, and from Florissant, Colo., have 

 been referred to this species, but most of these 

 specimens can not now be found. The only 

 one that I have been able to see is a very 

 fragmentary leaf from Florissant that may or 

 may not belong to this species, and in any 

 event it should have little weight in any scheme 

 of geologic distribution, unless other clearly 

 identical material can be obtained. In the 

 very extensive collections from Florissant 

 studied by Cockerell and me it has not been 

 observed with certainty. 



Ficus lanceolata was described by Heer from 

 material obtained in the Swiss Miocene in 1856, 

 but, as set forth in the synonymy above, this 

 name is preoccupied by a living oriental species 

 named in 1814, and consequently the species 

 was renamed by Cockerell Ficus navicularis. 

 This name, however, should be applied only to 

 the American specimens that had been referred 

 to Ficus lanceolata Heer, for a comparison' of 

 the figures given by Heer and Lesquereux 

 leads to the conclusion that they are not 

 conspecific. The American leaves are long, 

 narrowly lanceolate, with many close, parallel 

 secondaries, whereas the leaves from the 

 Swiss Miocene are not only larger but incline 

 to the obovate-lanceolate and have fewer 

 secondaries, which are scattered, much curved 

 upward, and very markedly camptodrome. 

 It is probable that the European leaves should 

 be given a new name, for they can not be 



