GEOLOGICAL SURVEY OB THE TERRI'i OKIES. 423 



1 



PopuLiTES Saline, sp. nov. 



Leaf large, thickish, membranaceous, smootli, broadestnear the base, 

 truncate or subcordate, narrowed into an obtuse point, five-nerved from 

 its base ; borders regularly undnlately lobed. 



A splendid leaf, preserved entire except the petiole. It is 12 cent, 

 wide, only 10 cent, long, triangular in outline, with the base subcordate 

 and the borders regularly obtusely undulate-lobed. The nervation is 

 in five primary veins from the base, all much divided, passing with the 

 principal divisions to the point of an obtuse lobe, anastomosing with 

 thick perpendicular nervilles. The medial nerve is pinnately divided 

 from al)ove the middle in three pairs of secondary veins. This form is 

 remarkable, and unlike any^ leaf known to me ; it has, however, a dis- 

 tant relation to the leaf published as Acer obtusilobum, (?) Ung., in 

 Amer. Jour. Sci. and Arts, Jul}', 1S6S, p. 100. Another specimen refer- 

 able to this species, but broken, indicates the leaf as coriaceous, and 

 has the nervation more distinct, much like that of a Platanus. — Salina 

 Valley. 



POPULITES APFINIS, Sp. n. 



Leaf round-quadrangular, thickish, membranaceous, rounded to the 

 petiole, abruptly narrowed to a short point, with undulate-dentate 

 borders ; nervation pinnate, craspedodrome. 



This leaf is much like the one which I have described as PopuUtes 

 cyeJophyJhij (?) Heer, in Amer. Jour. Sci. and Arts, July, 1868, p. 93, dif- 

 fering, however, by its square form, its undulately distantly dentate 

 borders, its secondary veins less numerous and more divided. The 

 fibrillar are distinct and the areolation alil^e. — Salina Valley. 



Ficus Sternbergii, sp. n. 



Leaf large, thick, coriaceous, entire, broadlj' oval, obtusely pointed, (f) 

 (point broken,) tai)ering to the petiole 5 nervation pinnate,thick, coarse, 

 eamptodrome. 



The leaf, destroyed in part, measures about 16 cent, in length, 9 to 10 

 cent, in width, has entire undulate borders and the nervation of a Ficus. 

 The lowest secondary veijjs, from a distance above the base, are oppo- 

 site, ascend in a more acute angle than the upper ones, (six pairs) which 

 are alternate and more distant from the basilar pair, all much divided by 

 tertiary veinlets, or thick librilloe, anastomosing in bows along the 

 borders. — Fort Barker. 



Sassafras Cretaceous, Newb. 



I have studied this form upon a large number of specimens, especially 

 at Fort Harker, where it is predominant. It varies, in the size of 

 the leaves, from 4 to 14 cent, long, without counting the petiole, 

 which is, according to the size of the leaves, from 3 to 5 cent. long. 

 Two forms are especially recognizable as varieties, with intermediate 

 characters : one with narrower, more pointed, less diverging lobes; the 

 other with broader, more obtuse, more divergii]g divisions. The nerva- 

 tion is the same, generally deep and coarse ; the borders are more or less 

 marked with a few short teeth, especially on the lower sides of the 

 lateral lobes, The following-described forms may be considered as 

 speciies, not only on account of their characters, but also from their 

 local distribution : 



