DESCIilPTION OF SPECIES— PLATANEJ5. 185 



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

 without distinct lobes, like our fig. 5, are rarely seen in tlie living species. 

 It is the form represented by Heer in Fl. Tert. Ilelv., pi. Ix.xxviii, 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. occldentaUs resembling this fossil form by their shape, having the 

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

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

 by the author to P. GuillelmcB. 



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

 As it is nearly entire or obtusely dentate, it l)elongs probaWy to P.Haijdenii, 

 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 profusion at 

 Golden, and often both forms are represented ui^on the same block of sandstone. 



Habitat. — Same as the former. 



Plata 11 us Rayiioldsii, Ncwby. 



Plate XXVI, Figs. 4,5; Plate XXVII, Figs. l-A. 



Plalaitvs BaynoUsii, Newby., Extinct Fl. of N. Am., p. 69.— Lesqx., Annual Report, 1872, pp. 379, 399.— 

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



Vnr. Integrifolin. 



Platanus integri/olia, Le8qx.,MSS. 



Leaves of large size, suborbiculiir or obscurely triangular in ontliue, more or less rounded and 

 entire toward the decurrent 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 lol)es or points below the more elongated terminal one, 

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

 poin.t 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 ol' Platan u.s. The 

 nervation of all the forms is perfectly similar. In pi. xxvii, fig. 2, the leaf, 

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

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



