100 THE FLOKA OF THE DAKOTA GROUP. 



iicter as tliat of S. cretaccum Newb., var. ohtusum Lcsq., and var. aeutilohum 

 Lesq. (Cret. Fl., PI. xiii, Fig. 1, and PI. xiv, Fig. 2). The only difference 

 Ijetween these fossil leaves of Sassafras and those of the living S. officinale 

 is, that in the first the lower secondary nerves pass toward the sinuses 

 and curve at a short distance below the borders while in S. officinale the 

 nerves reach the borders and there diverge on both sides, forming an 

 inflated margin at the base of the sinuses as in the leaves refen-ed to Lin- 

 dera (PI. XVI, Figs. 1, 2). The specimen described above is far better 

 characterized than that figured in Cret. Fl. (loc. cit). 



Habitat: Ten miles northeast of Delphos, Kansas. No. 4020 of the 

 collection of Mr. R. D. Lacoe. 



Sassafras ? pbimordiale, sp. nov. 

 PI. XVI, Fig. 10. 



Leaves of thin textui'e, palmately trilobate, narrowed to the base and 

 decurriiag to the petiole, lobes lanceolate, blunt-pointed, the lateral short, 

 half open, the median comparatively very long. 



The small leaf, about 4.5"°* long, 3""' broad between the apices of the 

 lateral lobes, whose divergence from the median nerve is 50°, looks like a 

 dwarfed leaf of Sassafras by its borders narrowed, decunuug to the base, and 

 joining the petiole at a distance from the point of union of the seeondaiies. 

 The latter are effaced in the lateral lobes'; a fcAv of them, observable in the 

 median one, are thin, curved in passing towards the borders, camptodrome. 

 The middle lobe is gradually naiTowed upward, is at least three times as 

 long as the lateral ones, and is separated from them by obtuse sinuses. 



Though the leaf is fragmentary, it is apparently related to S. aeutilohum 

 Lesq. and S. Mndfjd Lesq. (Cret. FL, PI. xiv. Figs. 3, 4, and especially PI. 

 XXX, Fig. 7). Tlie relation is not very closely marked, there being a great 

 difference not merely in the size but in the substance of the leaves. 



Habitat: Ellsworth County, Kansas. No. 525 of the museum of the 

 University of Kansas. Collected by E. P. West. 



Sassafras Mudgei Lesq. 

 Cret. FL, PI. xiv, Figs. 3, 4; PI. xxx. Fig. 7. 



Sassafras acutilobiim Lesq. 

 Cret. Fl., p. 79, PI. xiv, Figs. 1, 2; Cret. aud Tert. Fl., p. 56, PI. V, Figs. 1-5. 



