FOX HILLS AND LOWER MEDICINE BOW 75 



distinct." ^ Knowltoii foUowod Ilcer in refcrring the species to Platumis, but in more recent re- 

 ports both Berry - and Brown ' have revertcd to the original reference to Viburnum, in which I 

 concur. In comparisons with modcrn herbarium matcrial at The New York Botanical Garden, I 

 have seen no leaves of Platanus comparable to the combination of characters observed in the 

 leaves of Viburnum marginatum. These bear a close resemblance to several specics of Viburnum,, 

 however, such as the species mentioned by Lesquereux, and more particularly V. opulus and 

 V. paucijlorum of North America and V. sargentii Koehn of China. 



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

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



Collection—\]. C. Mus. Pal., Plesiotypes Nos. 1372, 1373, 1374, 1375. 



Viburnum montanum Knowlton 



(Plate 17, Fig. 2) 



Viburnum monlanum Knowlton, U. S. Geol. Surv. Bull. 163, 73, pl. 19, figs. 1, 2, 1900; idem, Prof. Paper 101, 



276, pl. 52, fig. 2, 1917. 

 Viburnumf prohlcmaticum Knowlton, U. S. Geol. Surv. BuU. 163, 71, pl. 19, fig. 4, 1900; idem, Prof. Paper 



101, 276, pl. 49, fig. 9, 1917. 



The collections contain only 4 well-preserved specimens of this forra, of which the best is 

 here figured. This is chflicult to distinguish from the type and figured specimens of the two species 

 mentioned above, particularly those from the Vermejo formation. 



It is possible, as Knowhon has pointed out, that these specimens are variants of Viburnum 

 marginatum Lesquereux. In the absence of gradational variants between the narrow elhptic 

 leaves of V. montanum and the typical smaller leaves of V. marginatum shown on phite 15, figure 

 3, it seems necessary to maintain the former as distinct. I .suspect that a larger suite of speci- 

 mens of this species might bring out a close rescmblance and possibly identity to the leaves 

 referred to V. contortum,'^ which is known from the Raton and Black Buttes floras, and to V. 

 speciosum from the Raton.^ 



The pre^dously recorded occurrences of V. viontanum are hmited to the Mesaverde and 

 Vermejo formations of Colorado and to the undifTerentiated Montana group of Utah. 



I can suggest no better generic reference for this species than Viburnum. 



Occurrence — Corson Ranch, Wyoming, Loc. P. 372; Elk Mountain road, Wyoming, Loc. 

 P. 374. 



Collection—V . C. Mus. Pal., Plesiotype No. 1376. 



DICOTYLEDON.^— POSITION UNCERTAIN 



Phyllites craigensis Dorf, n. sp. 

 (Plate 18, Fig. 3) 



There are 4 well-preserved specimens of a very distinctive type of leaf from Locahty P. 375. 

 I have been unable to find any fossil or living species with which a comparison could be made. 

 It seems desirable, nevertheless, to describe and figure the species for future reference. 



Description — Leaves wide-elliptic, with the base broadly cuneate and the tip acutely rounded; 

 length ranging from 8 to 13 cm., width from 4 to 8 cm., widest at the middle; petiole very stout, 

 short, wider than the midrib; midrib very thick below, gradually thinning toward the apex; 

 secondary venation indistinct, pinnate, 12 to 18 pairs of secondaries mainly decurrent along the 

 midrib, diverging at an angle of about 40° near the base and a somewhat greater angle near the 

 apex; secondaries branched irregularly and acutely, curving only shghtly upward, becoming 

 indistinct near the margins; tertiary venation obsolete; margin entire; texture coriaceous. 



In both shape and venation the fossil specimens approximate the leaves of several Uving 

 species of the genera Drimys and Illicium of the Magnohacese. The resemblance to Illicium 

 floridanum ElUs is striking in all characters except width and expanded petiole. 



1 HoUick. A., U. S. Geol. Surv. Prof. Paper 182, 166, 1936. 



- Berry, E. W., Canada Gcol. Surv. Mem. 182, 57, 1935. 



' Brown, R. W., U. S. Geol. Surv. Prof. Paper, manuscript, 1937. 



< Knowlton, F. H., U. S. Geol. Surv. Prof. Paper 101, 346, pl. 108, fig. 3, 1917. 



' Knowlton, F. H., ibid.. 347, pl. 111, fig3. 1-5. 



