66 DESCRIPTION OF SPECIKS. 



right angles to tlic midrib. The secondary veins and Ihcir divisions all 

 reach to very near the borders, even seem to reach them, anastomosing at 

 their ends with a veinlet which follows close to the margins in successive 

 short curves like a marginal vein. The nervilles are strong, more or loss 

 at right angles to the nerves, not continuous, anastomosing in the middle 

 of the areas, composing a net of large irregular quadrangular or polygonal 

 meshes. The surface of these leaves is rough, the venation deep and dis- 

 tinct, the substance thick, nearly coriaceous: the short petiole (7 milli- 

 meters long) is enlarged at the base. 



Hah. — Near Fort Harker. Chs. Sternberg. 



AMPELIDE^. 



CISSITES, Heer. 



Leaves more or less deeply trilobate by the extension of the lateral primary 

 nerves always in three, rounded and broadly enneate to the base; lobes deltoid or 

 round, entire or dentate, sometimes lobed ; secondary nerves mostly camptodrome. 



Under the name of Cissites insignis, and Avithout definition of the genus, 

 Professor Heer has described a fragment of leaf which has apparently a 

 degree of affinity to those which I place under this generic division. The 

 leaves are closely allied to AraUopsis by the primary nervation always 

 being trifid generally from a distance above the basal borders, and by the 

 areolation and the more or less distinctly trilobate division. The second- 

 ary veins are generally camptodrome. 



Cissites insignis, Heer. 



"Pliyll. Cret. du Neb.," p. 19, pi. ii, figs. 3 (4 restored). 



Leaves coriaceous, palmrtely deeply trilobate ; lateral lobes very unequal, lobes 

 crenate at the apex. 



This leaf is very coriaceous, triple-nerved, deeply palmately trilobate. 



The lower part of the lower lobe is larger than the upper, which is entire 



and bears three obtuse teeth toward the base; the secondary veins are 



thin, anastomosing in curves at a distance from the borders. 



Cissites salisburia-foliiis, sp. nov. 



Sassafras obtusum, Lesq.x., " U. S. Geol. Rep.," vi, p. 81, pi xiii, figs. 2, 4. 

 Popidites salisburio'/olius, Lesqx., "Am. Jour, of Sci. ,Tiid Arts," xlvi, 1868, p. 94. 



These leaves, first described as Fopulitcs. then as Sassafras or Arali- 



