176 THE FLOKA OF THE DAKOTA GKOUP. 



Order ILICINE^. 



Ilex borealis Heer. 

 PI. XXXV, Fig. 8. 



Fl. Foss. Arct., vol. 7, p. 39, PI. lxiv. Figs. 3, 4. 



Leave.s coriaceous, lanceolate, gradually naiTowed to the acute base; 

 borders entire, undulate; median nerve rigid, narrow; .secondaries ilexuous, 

 dissolving in the reticulation or curving at a distance from the borders. 



This leaf has all the characters of the species described by Heer with 

 the following exception. The author says of the borders of the leaves that 

 they are perfectly entire or dentii-ulate. His Fig. 4 (loc. cit.) shows the 

 borders undulate and a fragment (Fig 3) has them minutely dentate in the 

 upper part. Fig. 4 is made like ours, from a specimen of which the upper 

 part is destroyed ; this difference, therefore, remarked upon another more 

 fragmentaiy specimen can not be considered. Heer also describes the 

 median nerve as strong, but his figure does not show it broader than it is 

 in the leaf of the Dakota Group. 



The })reserved part of the leaf is 12"" long, 3""' In-oad; the secondaries, 

 at an angle of 50° to 55° from the midrib, are parallel and about equidis- 

 tant, some of them separated by shorter tertiaries, either parallel oi- at a 

 more open angle of divergence. The ner\dlles are strong, flexuous, branch- 

 ing or anastomosing at right angles. The specimens figured by Heer are 

 from Patoot, Greenland, where they occur with leaves of Lirioikndron 3Icekii, 

 Sa])mdus Morrisoni, etc. 



Habitat: Pipe Creek, Cloud County, Kansas. No. 4096 of the col- 

 lection of Mr. R. D. Lacoe. 



Ilex armata, sp. nov. 

 PI. XXIX, Fig. 8. 



Leaves coriaceous, lanceolate, sharply pointed, naiTowed and decuning 

 to the base; borders nearly entire, with few acute teeth; nervation pinnate, 

 camptodi'ome. 



The form f)f this leaf is peculiar. It is naiTOwlv lanceolate both ways, 

 l)ut bears on each side a single prominent tooth, one near the base which is 

 short, blunt-yiointed, at right angles to the border; the other erect, linear, 

 acuminate, placed in the upper part, on the opposite side of the leaf; Ijoth 

 entered by one secondaiy nerve which branches under them, the branches 



