58 CONTRIBUTIONS TO PAL^ONTOLOGY 



Ficus coloradensis Cockerell 

 (Plate 6, Fig,. 6) 



Ficus coloradensis Cockerell, Torreya, vol. 10, 223, 1910; Knowlton, U. S. Geol. Surv. Prof. Paper 130, 134, 



pl. 22, fig. 1, 1922; idem, Prof. Paper 155, 69, 1930. 

 Ficua irregularis (Lesquereux) Lesquereux (in part), R/ipt. U. S. Geol. Surv. Terr., vol. 7, 196, pl. 34, figs. 4-7, 



1878; Harvard CoU. Mus. Comp. Zoology Bull., vol. 16, 50, 1888; Ward, U. S. Geol. Surv., 6th Ann. 



Rept., 552, pl. 44, fig. 4 only, 1886; idem, Bull. 37, 38, pl. 20, fig. 4 only, 1887; Ivnowlton, U. S. Geol. Surv. 



BuII. 163, 51, 1900. 

 Ulmusf irregularis Lesquereux, U. S. Geol. Surv. Terr., 6th Ann. Rept. (1872), 378, 1873. 



Only 4 specimens in the coUections are of this type. None is completely preserved, though 

 enough is shown to indicate .similarity to the figured and type specimens of this species. There is 

 httle I can add to Ivnowlton's able discussion of its status.^ It is present in the Laramie, Denver, 

 and Medicine Bow formations, and occurs doubtfully in the Mesaverde, Hanna ("Upper Laramie" 

 of Knowlton), and Black Buttes fioras. 



I can offer no suggestions regarding the botanical affinities of this leaf form. 



Occurrence — Elk Mountain road, Wyoming, Loc. P. 374. 



Collection—U. C. Mus. Pal., Plesiotype No. 1327. 



Ficus cowanensis Knowlton 

 (Plate 7, Fig. 1) 

 Ficus cowanensis Knowlton, U. S. Geol. Surv. Prof. Paper 130, 139, pl. 8, fig. 6, pl. 9, figs. 2, 3, 1922. 



There are several incomplete specimens in the collections which are quite distinct in their 

 large size, entire margin, obovate-Ianceolate shape, extremely thick midrib, and thin, widely spaced 

 secondaries. They agree perfectly with the description and type specimens of Ficus cowanensis 

 from the Laramie formation. 



This species has never been found completely preserved. I suspect that it may ultimately 

 be found to be the same as some of the leaves usually referred to Magnolia or Laurus, as for exam- 

 ple, Magnolia leei Knowlton, M. hilgardiana Lesquereux, or Laurusf caudata Knowlton.^ 



Occurrence — Elk Mountain road, Wyoming, Loc. P. 374. 



Collection—l]. C. Mus. Pal., No. 1328. 



Family PLATANACE^ 



Genus CREDNERIA Zenker 

 Credneria protophylloides Knowlton 

 (Plate 8) 

 Credneria protophylloides Knowlton, U. S. Geol. Surv. Prof. Paper 101, 267, pl. 46, 1917. 



There is a single specimen and its counterpart and many incomplete specimens from Locality 

 P. 375 which are similar in size and essential details to the type and figured specimens of this 

 species from the Vermejo formation. The Medicine Bow specimen is somewhat larger than the 

 figured Vermejo specimen, but is identical with the large, unfigured specimen described by Knowl- 

 ton from the same formation. 



There is nothing to be added at the present time to the accurate description and discussion 

 of this species by Knowlton. He has already adequately pointed out the superficial resemblance 

 of this species to several American species of Protophyllum, and its greater similarity to a number 

 of European members of this genus. Comparable types appear to be rare in the late Cretaceous 

 and early Tertiary of the Rocky Mountains. Hollick has described a number of species pf 

 Credneria and of the related genera Protophyllum, Pseudoprotophyllum, and Pseudoaspidiophyllum 

 from the Cretaceous of AJ.aska.^ Most of these are represented by large leaves with the same 



■ Knowlton, F. H., U. S. Geol. Surv. Prof. Paper 130, 134, 1922. 



= Knowlton, F. H., U. S. Geol. Surv. Prof. Paper 101, 310, 313, 316, pl. Sl, fig. 2, pl. 85, fig. 1, pl. 89, fig. 1, 1917. 



" Hollick, A., U. S. Geol. Surv. Prof. Paper 150, 86-97, 1930. 



