5 
natifidum, Lesqx. (Bull. Mus. Comp. Zoél., Vol. VII., No. 6, p. 
227.) As only the first two are figured, and that from fragments, 
and the others very briefly described, I am unable to make any 
satisfactory use of this important material in tracing the life-his- 
tory of the genus. 
It is a remarkable fact that among all the great collections of 
Laramie and Eocene plants made on the Upper Missouri, in 
Oregon, Washington, Wyoming and Colorado, and studied by 
Lesquereux, Ward and the writer, not a single leaf of Lirtoden- 
dron has yet been identified. 
I append figures and descriptions of three new species of 
Tulip-tree recently obtained from the Amboy clays of Wood- 
bridge, New Jersey. 
LIRIODENDRON OBLONGIFOLIUM, n. sp, 
Praca eT: 
Leaves 6 to 8 inches in length, by 4 to 5 inches in breadth, 
oblong in outline, long-petioled ; base rounded, square or slightly 
cordate; summit deeply emarginate, sides bearing three or 
more obtuse or acute points, separated by shallow sinuses; 
nervation distinct, moderately strong, midrib straight, termin- 
ating in the bottom of the sinus of the upper extremity, lat- 
eral nerves nearly straight, parallel, forming two series, the 
stronger ones separated by intervals from a quarter to half an 
inch broad, branching and inosculating at their extremities, and 
forming a series of loops near the margin; between these are 
shorter and more delicate nerve-branches, which are usually 
simple and equally divide the interspaces. 
Unfortunately but few of these leaves have been found, and 
none of them are quite perfect. Together they are, however, 
sufficient to determine the general form and nervation. Their re- 
semblance to the leaves of the living species, L. ¢ulipifera, is strik- 
ing, but the form is more oblong. In the living species the lobes 
of the margin are quite variable; generally the basal pair are much 
developed, and above these a deep sinus on each side leads up to 
the terminal points. Not unfrequently, however, we find two, 
and sometimes three, points on a side, and a much nearer ap- 
proach to the form of the leaves before us. The leaves of the 
living species are, however, always shorter, and relatively broader, 
