lg(j THE FLORA OF THE DAKOTA GROtJP. 



in Ettingsliaiisen Neulioll. Char. d. Eocenefl. Europa's, p. 57. I have not 

 seen in fossil leaves any one of analogous characters. 



Habitat: Ten miles northeast of Delphos, Kansas. No. 4015 of the col- 

 lection of Mr. R. D. Lacoe. 



Sterculia lugubris Lesq. 

 Cret. aud Tert. Fl., p. 81, PI. vi, Figs. 1-3. 



Tribe HELICTERE^E. 



Pterospermites MODESTiis, sp. nov. 

 PI. LVIII, Fig. 5. 



Leaf small, subcoriaceous, oval, rounded at base to the enlarged 

 midrib aud in the same degree to the obtuse apex, entire; secondaries four 

 pairs, three lowest close to each other, opposite, the upper a single pair far 

 distant from the lo\Yer ones, all open in joining the midi'ib, then curved 

 upward toward the borders, craspedodi-ome. 



The leaf is oidy ff"^ long from its base, more than 4*"" broad at the 

 middle, and has a short petiole, apparently broken, 3""" below the base of 

 the leaf. The secondaries are distributed three at a short distance from 

 each other in the lower part of the leaf, one only at a distance above, and 

 curve toward the miibib, which they reach at an open angle of divergence, 

 traversing the blade in ascending toward the borders, and craspedodrome; 

 the upper ones have few branches, while the lower are joined by nervilles 

 at right angles, the middle space being taken by thin, flexuous nervilles at 

 right angles to the midrib. 



This leaf has an evident likeness in form, size, and nervation to Ptero- 

 sprrmum safjonanum Ett. (Foss. Fl. v. Sagor, pt. 2, p. 187, PI. xv. Fig. 17). 



Habitat: Near Fort Harker, Kansas. No. 2813 of the U. S. National 

 Museum. 



Pterospermites longeacuminatus, sp. nov. 

 PI. LIX, Fig. 3. 



Leaves ovate-lanceolate, prolonged into a verj' long, naiTow actimen; 

 borders entire or marked by one or two acuminate teeth ; narrowed in 

 rounding to the base and reaching the thick petiole in declining and decur- 

 ring abruptly to it; midrib straight, thick in the lower part, very thin in the 

 upper; secondaries alternate, at an acute angle of divergence, cur\ ed and 



