DESCRIPTION OF SPECIES. 69 



inequilateral; median nerve stont ; secondaries simple, camptodrome, curved 

 in passing- toward the borders, wliich they follow in a simple series of 

 areoles ; nervilles thick, distant, simple or forking, and anastomosing in tlie 

 middle. 



The leaves are about 11"" long and S.S""" broad below the middle. The 

 nervation is strongly marked; the secondaries, of which there are from ten 

 to twelve pairs, curve from the median nerve and near their base still more 

 strongly than toward the borders, which they follow in a series of long 

 festoons. 



Comparing this leaf to those in Heer's Fl. Foss. Arct., vol. 6, 2 Abth., 

 PI. XLii, Figs. 1, 2, the identity appears fully established. Two of the leaves 

 figured by Heer (loc. cit, PI. xli. Fig. 4c, and PI. xlii. Fig. 1), are inequi- 

 lateral or larger on one side than on the other, and the nervation, especially 

 in Figs. 1 and 2 of PI. xlii, is of the same character, although less dis- 

 tinctly marked than it is in the leaves from the Dakota Group. Heer 

 refers to this species a large, round nut (loc. cit., xlii. Fig. 3), evidently a 

 Juglans. 



Habitat: Ten miles northeast of Delphos, Kansas. No. 4104 of the 

 collection of Mr. R. D Lacoe. No. 859 of the museum of the University 

 of Kansas. 



Juglans crassipes Heer. 

 PI. XLIX, Figs. 1-3. 



Heer, Fl. Foss. Arct., vol. 7, p. 27, PI. lxi, Fig. 4 ; PI. lxv, Fig. 9. 



Leaves large, membranous, elliptical-lanceolate, quite entire ; midrib 

 thick; secondaries distant, very thin and much curved, camptodrome. 



The three leaves referred to the species of Heer agree with the descrip- 

 tion and the figures given by the author (loc. cit.). Figs. 1 and 3 of our 

 plate agree, especially in the form of the leaves and the nervation, with 

 Heer's Fig. 4, PI. lxi, while Fig. 2 has the midrib and petiole quite as thick 

 as that of Heer's Fig. 9, PI. lxv. The Dakota Group leaves, especially the 

 two first mentioned, agree still more closely with the figure given of the 

 species in Heer (Fl. Von Moletein, p. 23, PI. vi. Fig. 3), which the author 

 compares to J. acuminata Al. Br., of the Miocene. They still more closely 

 resemble those of J. Ungeri Heer (Fl. Tert. Helv., vol. 3, PI. clv. Fig. 18). 

 being larger than any of those of J. acuminata. The secondaries of this 

 species are thin, ei^pecially in comparison to the size of the midi'ib. 



