154 CONTRIBUTIONS TO PAL^ONTOLOGY 



Cinnamomum affine Lesquereux (in part), Rept. U. S. Geol. Surv. Terr., vol. 7, 219, pl. 37, fig. 5 on]y, 1878. 



Ward, U. S. Geol. Surv. 6th Ann. Rept., 553, pl. 67, figs. 1-3, 1885; U. S. Geol. Surv. Bull. 37, 50, pl. 24, 



figs. 3-5, 1887. 

 Ficus prxtrinerris Knowlton (in part), U. S. Geol. Surv. Prof. Paper 101, 263, 304, pl. 41, figs. 1-3 only, pl. 42, 



fig. 1, 1917; U. S. Geol. Surv. Prof. Paper 98, 338, 1916; U. S. Geol. Surv. Prof. Paper 155, 71, pl. 28, fig. 8 



only, 1930. 

 Ficus haddeni Knowlton, U. S. Geol. Surv. Prof. Paper 101, 260, pl. 38, figs. 6, 7, 1917. 

 Malapanna louisviUensis Knowlton, U. S. Geol. Surv. Prof. Paper 130, 144, pl. 7, fig. 5, 1922. 

 Ficus neoplanicostala Knowlton (in part), U. S. Geol. Surv. Prof. Paper 155, 69, only pl. 29, figs. 3, 4, 1930. 

 Cinnamomum sp., Knowlton, U. S. Geol. Surv. Prof. Paper 155, 87, pl. 39, fig. 1, 1930. 

 Ficus posi-trinervis Knowlton, U. S. Geol. Surv. Prof. Paper 130, 136, pl. 6, figs. 1, 2, 1922. Dorf, Bull. GeoL 



Soc. Amer., vol. 51, 218, 222, 225, 1940. 



The 2 figured speeimens are the best of 7 specimens which I believe referable to this species. 

 The minor variations shown in the angle of divergence of the lateral secondaries are not regarded 

 as of specific importance. The essential features of the leaves of this species, discussed in my 

 report on the Medicine Bow fiora, are present in all the Lance Creek specimens. 



Continued work with type specimens at the U. S. National Museum has shown that the 

 Laramie leaf specimens referred by Knowlton to Ficus post-trinervis are not distinguishable in 

 any observable features from the specimens which he designated as the cotypes of F. trinervis. 



The leaves of this species are widespread, though apparently nowhere particularly abundant, 

 in the late Cretaceous sediments of the Rocky Mountain region. In addition to its occurrence 

 in the type Lance formation, it is known also from the Mesaverde (Ericson-AImond), Vermejo, 

 Black Buttes, Medicine Bow, Fruitland, Laramie, Denver, Dawson, and Raton floras. 



The systematic status of this species is still in doubt. 



Occurrence — Localities P3854, P3859. 



CoUection—l!. C. Mus. Pal., Plesiotypes Nos. 2559, 2560. 



Quercus? viburnifolia Lesquereux 

 (Plate 16, Figs. 5, 7, 8) 



Quercus viburnifulia Lesquereux, Rept. U. S. Geol. Surv. Terr., vol. 7, 159, pl. 20, figs. 11, 12, 1878; U. S. Geol. 

 and Geog. Surv. Terr., Ann. Rept. (1876), 505, 1878; Bull. Harvard Coll. Mus. Conip. Zool., vol. 16, 46, 

 1888. Knowlton, Proc. Washington Acad. Sci., vol. 11, 191, 207, 1909; U. S. Geol. Surv. Prof. Paper 130, 

 127, 1922; U. S. Geol. Surv. Prof. Paper 155, 50, pl. 16, figs. 3-8, pl. 17, fig. 1, 1930. Dorf, Carnegie Inst. 

 Wash. Pub. No. 508, pt. I, 53, pl. 6, figs. 3, 5, 7, 1938; BuU. Geol. Soe. Amer., vol. 51, 218, 222, 225, 1940. 



Alnus auraria Knowlton and Cockerell. Knowlton, U. S. Geol. Surv. Prof. Paper 155, 49, pl. 15, fig. 6, 1930. 



helula fallax Lesquereux (in part). Knowlton, U. S. Geol. Surv. Prof. Paper 155, 50, pl. 15, figs. 7-9, pl. 16, 

 figs. 1, 2, 1930. 



Celastrus gaudini Lesquereux (in part). Knowlton, U. S. Geol. Surv. Prof. Paper 155, 99, pl. 45, fig. 9 (not 

 figs. 3, 4), 1930. 



Fraxinus sp., Knowlton, U. S. Geol. Surv. Prof. Paper 155, 124, pl. 58, fig. 7, 1930. 



Populus denverensis Knowlton, U. S. Geol. Surv. Prof. Paper 155, 61, pl. 23, fig. 5, 1930. 



Quercus purdonensis Knowlton, U. S. Geol. Surv. Prof. Paper 155, 52, pl. 17, fig. 2, 1930. 



Quercus whitei Lesquereux. Knowlton, U. S. Geol. Surv. Prof. Paper 155, 53, pl. 17, fig. 3, pl. 18, fig. 1, 1930. 



Vibumum contortum Lesquereux ?. Knowlton, U. S. Geol. Surv. Prof. Paper 155, 127, pl. 55, fig. 1, 1930. 



Leaves of this species are not rare in the collections; over 15 specimens were obtained from 

 six localities. Their occurrence in the beds of this region had previously been reported by Knowl- 

 ton,' whose specimens I havc seen at the U. S. National Museum. 



In addition to its occurrence in the type Lance flora, this species is known from the Black 

 Buttes, Laramie, Medicine Bow, Hell Creek, Dawson, and Denver floras; it has not been reported 

 from beds either older or younger than post-Montanan Cretaceous. 



The leaves of this species do not seem to me to be Quercus-like. Although they may reason- 

 ably be referred to the family Fagacese, I have not seen any modern leaves in this family which 

 are strictly comparable. In the absence of positive resemblances, it does not seem advisable to 

 change the generic reference at the present time. 



Occurrenc«— Localities P3652, P3853, P3854, P3855, P3857, P3859. 



Collection—V. C. Mus. Pal., Plesiotypes Nos. 2561, 2562, 2563. 



' Knowlton, F. H., Proc. Waahington Acad. Sci., vol. 11, 207, 1909. 



