93 



leaf, identifies ours with Heer's species. I have very rarely recognized it 

 among the specimens received for examination. 



Habitat. — Fort Harker, Kansas; a single specimen, No. 6433, from the 

 collections of the Smithsonian Institution. 



Liriodendron meekii, Heer, Phyllites, p. 21, PI. iv, Figs. 3-4. 



These leaves are figured from di-awings communicated to Professor Heer 

 by Dr. Hayden. They are small, 4£ centimeters long, truncate or scarcely 

 emarginate at the top, with round, veiy obtuse terminal lobes, and slightly 

 less obtuse basilar ones. The nervation is of the type of Liriodendron. I 

 have seen some fragments referable to this species in Dr. Hayden's and Pro- 

 fessor Hall's specimens ; but I have not been able to discover any myself. 

 All these fragments come from north Nebraska and from Minnesota. 



Habitat. — Near mouth of Big Sioux, Hayden. 



Dr. Newberry has in his Extinct Flora a species, Liriodendron primasimm, 

 which, according to the description, is distinct from this one by its large size 

 and the lobes more broadly rounded. It is described from specimens found 

 in Blackbird Hill, North Nebraska, by Hayden. 



Liriodendron intermedium, Lesqx., PI. xx, Fig. 5. 



Leaf large, three-lobate ; upper lobo elongated, deeply emarginate-lobed ; secondary veins thin, 

 parallel. 



Liriodendron intermedium, Lesqx., American Journal of Science and Arts, loc. 



cit., p. 99. 



Though the specimen represents a fragment, the upper part of a leaf, it 

 is sufficient to show the'relation of this leaf to the genus Liriodendron. The 

 leaf in its integrity is at least 14 centimeters long ; the basilar lobes 

 appear to have been much enlarged, and abruptly so, and the leaf contracted 

 or narrowed between the lower and upper lobes, which are obovate-obtuse, 

 4 centimeters long, and separated by a deep, slightly obtuse sinus. This 

 fragment shows a thickish, somewhat coriaceous leaf. 



Habitat. — South Nebraska, Hayden. 



Liriodendron giganteum, Lesqx., PI. xxii, Fig. 2. 



A mere fragment, still more incomplete than the former, representing 

 the half of the upper lobe of a species of this genus. From the preserved 

 part, the whole upper lobe measured 17 centimeters wide, while that of the 

 former species measures only 7J centimeters. The secondary veins of this 

 magnificent leaf are very thick, at least comparatively to those of the former 

 species, but not thicker than they are in large leaves of our L. tulipifera, L., 



