FOX HILLS AND LOWER MEDICINE BOW 59 



distinctive vonation as in Crcdncria protophylloides. With the possible exception of C. intermedia,'- 

 which is unfortunatcly not coaipletcly known, none of the Alaskan forms are entire-margined and 

 they are therefore not apparently conspecific with the Mcdicine Bow and Vermejo species. 



Among living forms, the widcsprcad Cretaceous genus Credneria has apparently no closely 

 similar leaf forms. Venation characters and general shape and size seem to indicate aflinities 

 with Platanus.^ 



Occurrence — Craig, Colorado, Loc. P. 375. 



Collection—\] . C. Mus. Pal., Plesiotype No. 1329. 



Family NYCTAGINACE^ 



Genus PISONIA (Plumier) Linn6 



Pisonia? racemosa Lesquereux 



(Plate 9, Fig. 2) 



Pisonia racemosa Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1873), 400, 1874; Rept. U. S. 

 Geol. Surv. Terr., vol. 7, 209, pl. 35, fig. 4, 1878. 



The small, delicate cluster of seed-like bodies here figured is not distinguishable from the 

 specimens of this species from Black Buttes, Wyoming. Their exact nature is problematical and 

 their reference to Pisonia is by no means definite, as Lesquereux clearly stated in his original 

 analysis. If they are seeds they are considerably smallcr and wider at the base than any seeds of 

 Pisonia (= Torrubia Vellozo) which I have been able to find for comparison. More and better 

 material will have to be obtained to make possible a definite systematic assignment. 



Remains of this type are evidently rarely preserved, as they have not been recognized in 

 deposits other than those at the type locality and those of the Medicine Bow formation here 

 recorded. 



Occunence — North of Walcott, Wyoming, Loc. P. 373. 



Collection—U. C. Mus. Pal., Plesiotype No. 1330. 



Family LAURACE.E 



Genus CINNAMOMUM (Tournefort) Linn6 



Cinnamomum linifolium ICnowIton 



(Plate 9, Fig. 1) 



Cinnamomum linifolium Knowlton, U. S. Geol. Surv. Prof. Paper 101, 319, pl. 88, figs. 3-7, 1917; idem, Prof. 

 Paper 155, 86, pl. 59, fig. 3, 1930. 



This type of leaf is rare in the collections, being represented at two localities by only three 

 fragments, the best of which is here figured. It agrees in essentially all observable characters with 

 the description and type specimens of this species from the lower Raton and Dawson formations 

 of Colorado. 



Knowlton has previously pointed out tlie general resemblance of this species to Cinnamomum 

 ohlongatum Berry and C. vera Berry from the Gulf Coast Eocene.^ To my knowledge there are no 

 other fossil forms known in North America with which even a general comparison can be made. 



Knowlton was originally in doubt concerning the generic reference of this species. There is 

 unquestionably a resemblance to Cinnamomum. I have also found leaves of essentially the same 

 type in herbarium specimens of Cocculus larvifolius D.C., and Lindera caudata Benth., of Asia. 

 More complete specimens will be necessary, however, before detailed comparisons can be made. 



Occurrence — North of Walcott, Wyoming, Loc. P. 373. 



Collection—V . S. Nat. Mus. Coll., Plesiotype No. 1331. 



' HoUick, A., ibid., 89, pl. 55, fig. 1. 



«Seward. A. C, Plant Life through the .\gea, 404, 1933; Potonie-Gothan. Lehrbuch der Palaobotanik, 377, 192L 



' Berry, E. W., U. S. Geol. Surv. Prof. Paper 91, 297, pl. 79, figs. 1-8, pl. 83, fig. 6, pl. 87, fig. 4, 1916. 



