98 



angle to the veins, subcontinuous ; areolation platanoidal. There is an apparent 

 difference between the leaves representing this species. The small leaf (PL 

 iii, Fig. 2,) is more acutely pointed and more acutely tapering to the base, 

 where the borders turn to the medial nerve, and follow it, in decurring, to the 

 petiole, which is broken in both leaves ; the borders appear mostly entire, and 

 the nervation more indistinctly palmate. But in comparing both leaves care- 

 fully, these differences are recognized as merely resulting from the development 

 of each leaf. In the small leaf there is harmony of conformation in the more 

 elongated point and base; the denticulation, in its peculiar form, is visible near 

 the point; and at the base the distribution of the lateral nerves compares with 

 that of the larger leaf by the two inferior veins of the right side, which are 

 narrower, and by the exact coincidence of the two inferior veins of the left 

 side ; the lowest, thin, marginal, and simple; the other thick and much divided. 

 The leaf of PI. iii, Fig. 4, is apparently, too, referable to the same species. 

 It was described under the name of Populites jlabellata in the American Journal 

 of Science and Arts, loc. cit., p. 94 ; but in comparing it to Fig. 3, it seems 

 to be a mere deformed leaf of a same kind, turned to one side by compression, 

 and with the point broken or recurved inward. It has about the same num- 

 ber of lateral veins, the lower appearing more divided, and giving thus a dif- 

 ferent fades to the leat ; but the same character is recognized in the large 

 leaf of PI. xxv, Fig. 3. 



I owe to Count Saporta the indication of the relation of this species to 

 Greviopsis, a new genus established by him in the family of the Tiliacece. for 

 some leaves from the Lower Eocene of Sezane. The Cretaceous species is 

 comparable by some of its characters, especially the nervation and the den- 

 ticulation, to G. credneriaformis, Sap. 



Habitat. — South of Fort Harker, Kansas, Leconte, Mudge, &c. 



iNCEKTiE SEDIS. 



Anisopiiyllum, Lesqx. 



Leaves thick, coarsely-veined, ovate or obovate in outline, either abruptly narrowed, subtrnncate, 

 and subcordato to the petiole, or rounded, wedge-form to the base, irregularly lobato on one side, deeply 

 undulate ou the borders ; nervation irregularly 3-5-palmate from above the base of the leaves ; primary 

 veins much divided. 



Anisophylltjm semi-alatum. Lesqx., PI. vi, Figs. 1-5. 



Quercus semi-alata, Lesqx., American Journal of Science and Arts, loc. cit., 



p. 96. 



These leaves, all marked with a coarse nervation and of a thick texture, 



