DESCRIPTION OF SPECIES— MORE^. ]95 



fo tliese leaves a flicies different from that of leaves of tliis genus. Tliis char- 

 acter, as also the absence of tertiary intermediate veins, are, however, remarked 

 upon the leaves of Ficus elastica and other living species, and in a less distinct 

 degree upon those of the fossil F. Gcepperti, Ett. Nevertheless, I do not 

 consider the relation of these leaves to this genus as positively ascertained 

 Habitat. — Carbon Station, Wyoming. 



Ficus arenacca, Lesqz. 

 Plate XXIX, Figs. 1-5. 

 FiVks arenacia, Lesqs , Animal Report, 1871, p. 300. 



Var. a, brcvipetiolata. 



Figs. 2, 5. 

 Fieua Gaudini, Lesqx,, Annual Report, 18T1, p. ;!00. 



Leaves large, coriaeeous, very entire, bro.-idly lanceolate, acuminate, rounded and narrowed to a 

 thick petiole; lateral veins thick, subequidistant, parallel, camptodrome. 



Though there is a marked difference in the size of these leaves, especially 

 in the length of the |)etiole, they are so similar in shape, general facies, and 

 nervation that they appear to represent the same species. In fig. 1, the base 

 of the leaves is not rounded to the petiole, rather slightly decurrent, and, 

 according to this form, the basilar lateral veins are more oblique than those 

 of figs. 2 and 5. But the fragment on the right of fig. 1 has its base some- 

 what more enlarged and the basilar lateral nerves a little more open than 

 those of the other leaves upon the same specimen, a deviation of type whicli 

 becomes more marked when the base is more enlarged. The petiole of these 

 narrower leaves is longer, a difference also seen sometimes upon leaves of 

 Ficus of the same species. Except this, the characters are the same, con- 

 sistence of the derma, thickness of the midrib, generally channeled, especially 

 toward the base, direction and distribution of the secondary nerves, etc. In 

 fig. 2, whose surface is more distinctly preserved, the veins are seen obliquely 

 crossed by nervilles; but the details of areolation are obsolete. The size 

 of the leaves varies from eight to fifteen centimeters in length and from three 

 to eight centimeters in width.. 



Habitat.— Green River group {Dr. F. V. Hayden). 



Ficus Uug:eri, Lesqz. 



Plate XXX, Fig. 3. 

 Ficus Ungeri, Lesqx., Supplement to Annual Report, 1871, p. 7. 



Leaf large, coriaceous, oblong, Ungulate, acuminate or pointed, rounded to the base ; borders very 

 entire ; lateral nerves opeu, e<|uidistaut, parallel, simply camptodrome. 



This splendid leaf, twenty centimeters long without the petiole, ten 

 centimeters broad, shows in its nervation the characters of species of this 



