with D< scripUons of X w v 



In size, these leaves exceed those of any known bi 

 sycamore, and if we are correct in referring them to PI 

 they may be considered the only relics we have of by far the 

 noblest species of the genus. Some of the leaves are a fool and 

 a half in length, and of about equal breadth, and yel they do 

 not so far exceed the ordinary size of the leaves of the Syca 

 mores as do the leaves of Acer macrophyUum those of other 

 species of maple. 



Fur mid Ion and Locality. Miocene Tertiary beds Near 

 Fort Clark, on the Upper Missouri. (Dr. Bayden.) 



Platanus Raynol<l«ii (n. sp.) 



Leaves of large size, sub-orbicular or rudely triangular in outlii 

 more or less rounded below, three-pointed above, often deem 

 on to the petiole, margins at base entire, on th-- Bides and above, 

 coarsely and obtusely double-serrate, the lobes of the upper margin 

 short and broad, less produced than in niosl other specif b; n< 

 tion strong but open, having the general character of /'. oceidi ntalU 

 and of the fossil species P. aceroides. 



The younger leaves are rounded in outline, and decurrent 

 on the petiole. Those more fully developed (which are 

 times fifteen inches in length and breadth), more triangular in 

 form, not always decurrent, and having tin- lobes more produced, 

 offer considerable resemblance to those of /'. an 



extinct species from the Miocene of Europe; the ner 

 being similar in kind, and not greatly different in degree. I 

 leaf is, however, always less angular than in /'. 

 P. ITaydenii, and the character of the marginal Berration 

 essentially different from that of any known spec In P- I 



roides the margins are set with long, acute, cm 

 teeth, as in the living P. occidentalis / in /'. H 

 margins are for the most part only Binnate; and in /' 

 the middle lobe only is toothed, and that h bile in 



the species before us, with th< ption of tl pn, 



the whole outline is marked by a broad, double d< 



tation. 



