76 CONTRIBUTIONS TO PAL^ONTOLOGY 



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

 Collection—U. C. Mus. Pal., Type No. 1377. 



Phyllites \\nlderi Dorf, n. sp. 

 (Plate 18, Fig. 4) 



The single specimen figured is the only one of this kind in the coUections. I have been unable 

 to find any figured fossil forms with which a comparison was justified. The specimen is complete 

 enough, however, to warrant description and figure for possible future reference. 



Description — Leaf oval-obovate, with asymmetrical, acutely cuneate base, and short, bluntly 

 pointed tip; length approximately 11 cm., width about 4.5 cm. at the widest portion just above 

 the middle; midrib heavy, straight; about 8 pairs of thin secondaries, mainly opposite or subop- 

 posite, rather eciually and distantly spaced, branching from the midrib at an angle of 50° to 60°, 

 and converging shghtly toward the margin wliere they form inconspicuous loops with the second- 

 aries above; margin entire; texture firm. 



The species is named for Mr. Beverly Wilder, who assisted in the collection of the material. 



Definite generic allocation of this specimen cannot be made until a larger suite of better 

 material can be obtained. 



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



Colleciion—V. C. Mus. Pal., Type No. 1378. 



Phyllites conwajd Dorf, n. sp. 

 (Plate 18, Fig. 2) 



The figured specimen is the only one of this type of leaf in the collections. It is so nearly 

 complete, however, that it seems desirable to record its presence in the Medicine Bow flora. No 

 comparable fossil forms have been recorded, to my knowledge. 



Description — Leaf obovate, narrowed rather abruptly to a slightly acuminate, rounded tip 

 and more gradually to an apparently broadly cuneate base; length about 11 cm., width 7.5 cm. ; 

 midrib stout and straight ; (3 to 7 pairs of prominent secondaries, occasionally decurrent, leaving 

 the midrib at angles of 40° to 60°, arching abruptly upward well within the margin to join sec- 

 ondaries above or their lower branches in wide loops; tertiary veins fairly prominent, widely 

 spaced, mainly percurrent, occasionally parallel to secondaries along the midrib; margin entire; 

 texture fairly thin. 



I have no suggestions regarding a generic reference for this specimen. 



Occurrence — Corson Ranch, Wyoming, Loc. P. 371. 



Collection—U. C. Mus. Pal., Type No. 1379. 



Phyllites colubrinoides Dorf, n. sp. 

 (Plate 19, Figs. 4, 5) 



There are 8 specimens from 2 locahties which at first seem comparable to the leaves referred 

 to Trochodendroides nebrascensis. Closer scrutiny, however, reveals a number of differences which 

 are so constant that I am convinced that these leaves belong to a diilerent species, if not also a 

 different genus. The main points of distinction appear to be the thick coriaceous texture, the 

 relatively large, evenly spaced teeth, the turned-down petiole, the narrowly cuneate base and the 

 inward-Iooping prominent secondaries and tertiaries in the leaves here referred to Phyllites colu- 

 brinoides. 



Description — Leaves wide-lanceolate to elliptic, gradually narrowed to an acute apex and a 

 narrowly cuneate base; length 3 to 6.5 cm., width 2 to 3.3 cm.; petiole turned abruptly downward, 

 not well preserved; prominently 3 pli-nerved from the top of the petiole, the midrib and lateral 

 primaries of almost equal strength; lateral primaries leaving the midrib at 30° angle or less, curving 

 abruptly upward, parallehng midrib to near the apex where they fork into two veins, one of which 

 enters a marginal tooth, the other looping inward to join the upper secondaries; one pair of prom- 

 inent secondaries diverging acutely from above the middle of the midrib, running subparallcl to 

 the midrib, forking into the marginal teeth, and ultimately looping inward to join the midrib near 

 the apex; 5 or 6 prominent secondaries given off from the marginal side of the lateral primaries, 

 looping distinctly upward to join the ones above, and giving off less prominent tertiary veins into 



