LESQUEEEUX.] NEW TERTIARY FOSSIL PLANTS. 313 



near the base, simple or rarely branching, passing up in an angle of 

 divergence of thirty to thirty-five degrees, nearly straight to the bor- 

 ders, craspedodrome ; details of areolation obsolete. 



Habitat. — Near Fort Fettermau, in connection with a profusion of 

 remains of Taxodium disticlium, Lieutenant Vogdes. 



19. Castanea mTERMEDiA, sp. nov. 



Leaves proportionally long and narrow, linear-lanceolate pointed, 

 narrowed to the base ; borders equally and sharply dentate; teeth acu- 

 minate, turned upward ; areolation and nervation similar to that of 

 Castanea Vesca. By its character it is intermediate between Castanea 

 TJngeri of the Miocene and G. vesca. 



Habitat. — Middle Park, Br. F. V. Hayden. 



20. Carpinijs grandis, Ung. 



This species, so common in the Miocene of Europe, is represented la 

 our flora by a number of leaves identical in all the characters. 

 Habitat. — Xear Florissant, South Park, Dr. F. V. Hayden. 



21. QUEECUS Haidingeri, Ett. 



Leaf ovate-lanceolate, narrowed to the base (point broken) ; borders 

 obtusely crenato-serrate ; lateral veins numerous, close, on an angle of 

 divergence of forty to forty-five degrees, rarely branching, camptodrome 

 and craspedodrome. The leaf appears to be tapering to a point. It is 

 upon coarse sandstone, and the details of areolation are totally oblit- 

 erated. By its form, the divisions of the borders, and the nervation, it 

 agrees with the characters of the species, except that in this leaf the mid- 

 dle nerve is not thickj as described by Heer. 



Habitat. — Green Eiver, JDr. F. V. Hayden. 



22. Planera TJngeri, Ett. 



Leaves short-petioled, ovate, acuminate, narrowed to the base, simply, 

 coarsely serrate Irom the middle upward ; secondary veins nine pairs, 

 passing up to the point of the teeth in an acute angle of divergence. This 

 form, though represented by one leaf only, is in entire concordance of 

 characters with those of this species widely distributed in the Miocene of 

 Europe. 



Habitat. — South Park, Capt. Ed. Berthoud. 



23. Ficus ovALis, sp. nov . 



The only leaf repesenting this species is coriaceous, oval, entire, nar- 

 rowing in a curve to a long thick or flat broad petiole, grooved in tbe 

 middle penninerv; lateral vein alternate, camptodrome, curving along 

 the borders in festoons; tertiary veins short; areolation obsolete. The 

 upper part of the leaf is broken. 



Habitat. — Pleasant Park, Plum Creek, Br. F. V. Hayden. 



24. Ficus pseudo-popultjs, sp. nov. 



Leaves oval-pointed, narrowed to the petiole, entire, three-nerved from 

 the top of the petiole ; lateral veins at an acute angle of divergence, 

 like the secondary veins, two or three pairs, the lower of which is at a 

 great distance from the primary ones, -camptodrome; nervilles distinct, 

 in right angle to the midrib, crossed by oblique branchlets, forming a 

 large equilateral or polygonal areolation. A remarkable species, 



