3.02 GEOLOGICAL SURVEY OF THE TERRITORIES.. 



of the lateral nerve follow the borders in festoons along the base of the 

 leaf, and, as in the former species, there is a pair of marginal veinlets 

 under the primary nerves, and at right angle to the midrib. The areola- 

 tion is mostly in square or angular large meshes, less irregular than in the 

 former species. From the form of the leaf, the short inflated petiole, and 

 the character of the areolation, the leaf appears referable to the same 

 generic division as the former. It differs, however, by the primary and 

 secondary veius joining the borders, and not curving inside of them. 

 These two leaves appear to be transitional in their characters between 

 the Araliacew and the Ampelidece. 

 Habitat. — South of Fort Harker, Ghs. Sternberg. 



AMPELIDEJE. 



Cissites, Heer. 



Under this generic name, Professor Heer has described in the Phyl- 

 lites du Nebraska, p. 20, PI. II, figs. 3 and 4, fragment of a leaf which 

 seem to have a close affinity to those which I describe under this same 

 division. These leaves, enlarged on the sides and above the middle 

 by the extension of primary lateral veins, are either deltoid, pointed, 

 or round, or lobate at the top, and broadly rounded and attenuated to 

 the base. Their primary nervation, trifid from above the base- 

 border of the leaves, is of the same type as that of the Sassafras 

 (Araliopsis), and the secondary veins, all camptodrome, curving along 

 the borders in successive bows, have also an undeniable affinity with 

 the same group. But they evidently differ by the less distinct trilobate 

 division of the leaves, the broader base, the smaller size, and the general 

 facies. It is evident, however, in comparing the leaves described under 

 this generic name, that closely relatednas they are between themselves, 

 they are altogether allied by some of their characters to the Aralicece. 



Cissites Haekeriantjs. PI. VII, figs. 1 and 2. 



Sassafras ( Araliopsis) Harkerianuvi, Lesqx., Cret. Flora, p. 81, PI. XI, fig. 4. 



Leaves coriaceous, round in outline, subtrilobate, broadly cuneate to the 

 base; nervation trifid from above the border base ; lateral primary veins 

 branching ouiside ; secondary nerve simple, distant, mostly opposite campto- 

 drome or craspedodrome. 



The two leaves figured here are smaller than that of Plate XI, fig. 

 4, of the Cretaceous Flora ; but there is not any marked difference in the 

 outline and the nervation ; we have, moreover, specimens showing 

 leaves of intermediate size. The nervation is more or less pronounced, 

 according to the face exposed by the specimens. This and the following 

 form might be indifferently referred to Sassafras (Araliopsis) or Cissus. 



Cissites affinis. 



Platanus affinis, Lesqx., Cret. Flora, p. 71, PI. IV, fig. 4, PI. XI, fig. 3. 



Leaves coriaceous or subcoriaceous, round, polygonal in outline, subtri- 

 lobed, rounded and narrowed to the petiole, broadly deltoid to the point ; 

 borders undulate; distantly short dentate; nervation trifid from the base 

 or from a little above the borders. 



From the comparison of a number of specimens, and especially from 

 the discovery of one representing, by the splitting of the stone, both 

 sides of the leaf, I have ascertained that the one represented, Plate IV, 

 fig. 4, whose veins are thin, and the surface scarcely furrowed by the 



