FOX HILLS AND LOWER MEDICINE BOW 55 



piensis and Ficus plincrva Chanoy and Sanborn ' appcar to havo survived into the Tertiary on the 

 Gulf coastal plain and the Pacific Coast respectively. 



Among living forms I have noted a general similarity of the ieaves of Ficus planicostata to a 

 number of genera: Cocculus (Cebatha) and Ilypcrbiena of the MenispermaceJE, Alchornea and 

 Mallotus of tlie Euphorbiaceic, Pterosperrnum (Sterculiacepe), Ilampea (Bonbacacese), Colubrina 

 (Rhamnacea;), and Ficus (Moracea;). After consulting all available herbarium material of both 

 eastern and western liemisphere representatives of thesc genera at The New Yorlc Botanical 

 Garden, I am convinced that tlic refcrence to Ficus is not only reasonablo but probably correct. 

 A close resemblance vvas noted between the fossil specimens and the leaves of Ficus colubrincB 

 Standley ^ of Guatemala and Ficus integrifolia Elm.' of the Philippines. Except for their re- 

 motely toothed margins the lcaves of Ficus riedelii Miq.'' of Celebes are also comparable. 



Occurrence — Corson Ranch, Wyoraing, Locs. P. 371, P. 372; north of Walcott, Wyoming, 

 Loc. P. 373; Elk Mountain road, Wyoming, Loc. P. 374; Craig, Colorado, Locs. P. 375, P. 376. 



Collection—V . C. Mus. Pal., Plesiotypes Nos. 1391, 1319, 1320, 1321. 



Ficus cockerelli Knowlton 

 (Plate 7, Fig. 2) 



Ficus cockerelli Knowlton, U. S. Geol. Surv. BuII. 696, 273, 1919; idem, Prof. Paper 130, 132, pl. 12, fig. 2, 



pl. 23, figs. 1, 2, 1922. 

 Ficus lalifolia (Lesquereux) Knowlton, U. S. Geol. Surv. Bull. 152, 102, 1898; idem, Prof. Paper 101, 304, 



1917. (Homonym, Kunth, 1846.) 

 Ficus planicostaia lalifolia Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1872), 393, 1873; Rept. 



U. S. Geol. Surv. Terr., vol. 7, 202, pl. 31, fig. 9, 1878. 



There are about 10 specimens of this type, which are similar except in their slightly smaller 

 size to the figured and type specimens of this species. I was at first inclined to regard these 

 specimens as variants of Ficus planicostata. Among the large number of specimens of the latter 

 species, however, there are none which vary in the direction of the round, broad leaves of F. 

 cockerelli. The heart-shaped base and the venation of this species are also distinctive. There is 

 a resemblance to F. speciosissima Ward from the Mesaverde formation * and F. leei Knowlton 

 from the Verraejo,^ which I believe are conspecific with each other. These, however, are decidedly 

 more heart-shaped at the base, are longer in proportion to their width, and possess notable dif- 

 ferences in both secondary and tertiary venation. 



Ficus cockerelli is reported in the above citations to be questionably present in the Raton 

 fiora and fairly common in both the Laramie and Black Buttes floras. It is said to occur also in 

 the Wilcox of the Gulf states.' I have not seen the Wilcox specimens, which Berry more recently 

 has considered synonymous with Ficus mississippierisis.^ 



Among modern leaves these specimens are in my opinion more similar to the leaves of 

 Cocculus, Cissampelos, and Menisperminn (Menispermacese) than to any species of Ficus which I 

 have seen. Except for their thinner texture, it is difficult to distinguish the fossil speciraens from 

 the leaves of Cocculus {Ccbatha) carolinus (L.) DC^ 



Occurrence — Corson Ranch, Wyoming, Locs. P. 371, P. 372; north of Walcott, Wyoming, 

 Loc. P. 373; Elk Mountain road, Wyoming, Loc. P. 374. 



Colleciion—lJ. C. Mus. Pal., Plesiotype No. 1322. 



> Chaney, R. W., and Sanborn. E. I., Carnegie Inst. Wash. Pub. No. 439. 66, 1933. 



' See sheet No. 7668 at The New Vork Botanieal Garden. 



' See sheet No. 76244. 



< Chaney, R. W., and Sanborn, E. I., Carnegie Inst. Wash. Pub. No. 439, 67, 1933. 



' Ward, L. F., U. S. Geol. Surv. Bull. 37, 39, pl. 21, fig. 3, 1887. 



• Knowlton, F. H., U. S. Geol. Surv. Prof. Paper 101, 261, pl. 39, figs. 1, 6, pl. 40, figs. 1. 2, 1917. 



' Berry. E. W., U. S. Geol. Surv. Prof. Paper 91, 199, 1916. 



' Berry, E. W., U. S. Geol. Surv. Prof. Paper I3I-A, 9, 1923. 



' See sheet No. 18, Alabama, in the Princeton University herbarium. 



