DESCEIPTION OF SPECIES— PLATANE^. 185 



degree of evidence, as the ancestors of P. occidentalis. Small round leaves, 

 without distinct lobes, like our fig. f), are rarely seen in the living sj^ecies. 

 It is the form represented by Heer in Fl. Tert. Helv., pi. Ixxxviii, fig. 10, as 

 P. aceroides. It is also very rare to find in the living state as large leaves as 

 that of our fig. 3, with nearly entire or scarcely dentate borders, all the 

 leaves of P. occidentalis resembling this fossil form by their shape, having tlie 

 base narrowed, wedge-form, and the borders distinctly and sharply dentate. 

 But we have a similar form in Heer (Fl. Foss. Arct., pi. xlvii, fig. 1), referred 

 by the author to P. Guillclmce. 



Fig. 6 of our plate represents a separate stipule of a different species. 

 As it is nearly entire or obtusely dentate, it belongs probably to P.Haydenii, 

 Newby., whose leaves are generally very large, either trilobate, with lobes 

 directed upward and obtusely dentate, or with merely ovate, simply or doubly 

 dentate leaves, without lobes. Specimens of this species occur in jjrofusion at 

 Golden, and often both forms are represented upon the same block of sandstone. 



Habitat. — Same as the former. 



Platan II s Rayiioldsii, Newby. 



Plate XXVI, Figs. 4, 5 ; Plate XXVII, Figs. 1-3. 



Platanus Eaynoldsii, Newby., Extinct Fl. of N. Am., p. 69. — Lesqx., Animal Report, 1872, pp. 379, 399. — 

 Schp., Pal. V^g^t., ii, p. 708. 



Tnr, in tegr Ifolln. 



Plo.ianus intcgrifolia, Lesqx., MSS. 



Leaves of large size, suborbicular or obscurely triangular in outline, more or less rounded and 

 eutiro toward the decurreut bise, dentate, serrate or undulate, even entire, subcoriaceous. 



The author of this species has had for his description a leaf fully pre- 

 served, with two short lobes or points below the more elongated terminal one, 

 and with borders coarsely doubly dentate. None of my specimens has the 

 point preserved; the general shape only is surmised from the more or less 

 incomplete fragments, and the denticulation is marked upon all the leaves of 

 pi. xvii, either in sharp or obtuse, small teeth passing above to mere undula- 

 tions. Though I have no doubt that all these leaves represent the same species, 

 there are some differences, striking enough to warrant the representation of 

 these leaves of ours, which expose characters not recognized in the specimens 

 which were in the possession of Dr. Newberry. This difference is especially 

 in the integrity of the borders of the leaves (pi. xxvi, figs. 4 and 5), a character 

 which has not been recognized to this time in any species o'l Platanus. The 

 nervation of all the forms is perfectly sin)ilar. In pi. xxvii, fig. 2, the leaf, 

 dentate at or near the base, is merely undulate in its upper part, and, from the 

 direction and thinning of the primary nerves, it is evidently not lobate, but 



