198 UNITED STATES GEOLOGICAL SUEVET— TERTIARY FLORA, 



Helv., p. 07, pi. l.wxv, figs. 12 and 13). The nervation is, however, of a dif- 

 I'erent type, rather lii^e (hat of the two former species. By its shape, the 

 leaf resembles a Populus. Its base, enlarged after curving slightly down to 

 the petiole, is rounded, and the upper part is lanceolate at first and then con- 

 tracted into a long twisted acumen. The midrib is of medium thickness, as 

 is the petiole also, which is apparently broken, and therefore comparatively 

 long; tiie secondary nerves, alternate, subequidistant, slightly deflecting to 

 the midrib, pass in broad curves under an angle of 40° to 50° to the borders, 

 which they follow, anastomosing in sin)ple bows; the nervilles are strong, of 

 the same disposition as in the former species. The only specimen ol)tained of 

 tl)is is figured. The lamina of the leaf is seven and a half centimeters long 

 with the acumen, five centimeters broad below the middle, and the petiole 

 two and a half centimeters. 



Habitat. — Black Buttes, Wyoming; very rare. 



Ficns ovalis, Leeqx. 



Plate XXX, Fig. 2. 



Fiea) ovalia, Lesqx., AoDual Report, 1874, p. 313. 



Leaf coriaceous, oval, entire, narrowing iu a curve to a long, tbick, flat, grooved petiole ; lateral 

 nerves alternate, camptodrome ; tertiary veius short ; areolation obsolete. 



I have seen of this species only the specimen figured here. The leaf, 

 whose upper part is destroyed, seems to be gradually narrowed to an obtuse 

 point. It is six to seven centimeters long, the preserved part being four and 

 a half centimeters; four centimeters broad, and the petiole three centimeters. 

 The borders at the base are abruptly bent down to the petiole, and follow it, 

 forming a flat margin on both sides. The lateral veins are all on the same 

 broad angle of divergence of about 00°, the lowest joining the midrib a little 

 above the base, with indistinct basilar veinlets, whose fragments are seen 

 on the left side of the figure. They anastomose in simple curve in follow- 

 ing close to the borders. The nervilles and areolation are obsolete; some 

 veinlets, probably branches of the secondary veins, are distinct in the upper 

 ])art of the fragment. No species of fossil Ficus is distinctly related to this; 

 the form of the leaf resembles that of Populus mntahiUs var. ovalis, Hecr. 



HABirAT. — Pleasant Park, Plum Creek, Colorado, with Sahal Goldiana 

 {Dr. F. V. Ilayden). 



