6 
yet the resemblance on the whole is so close that it is impossible 
to avoid the conclusion that we have in these Cretaceous leaves 
relics of the progenitor of the living species with all the more 
important characters of form and nervation already distinctly 
specialized. 
LIRIODENDRON QUERCIFOLIUM, n. sp. 
Pr: LXIN,; Fie. 
Leaves large, 6 inches long by 4 broad, long: petioled, base 
horizontal or slightly cordate, summit deeply emarginate, sides 
bearing each three or four pointed, sometimes spatulate lobes, 
separated by narrow sinuses which reach nearly to the midrib; 
mervation regular, midrib straight or curved, terminating at the 
bottom of the sinus of the summit, strong side branches travers- 
ing each lobe and terminating in the point, between these more 
delicate, generally simple, branchlets. 
The general form of these leaves is considerably like that of 
some of the oaks, Quercus alba, Q. nigra, etc.; a character 
which has suggested the name. The strong terminal emargina- 
tion, and the nervation suffice, however, at once to separate them 
from Quercus, and bring them into Liriodendron. As will be 
seen by the figures now given there is considerable diversity in 
these leaves, some having broader lobes and shallower sinuses, 
approaching the form of those of L. oblongifolium, with which 
they are associated in the Amboy clays. Asa whole‘they show 
a variation from the leaves of the living species in an opposite 
direction from those of L. oblongifolium, the latter being more 
simple in outline, oblong in form, with small points or lobes on 
the sides, whereas these are much more deeply lobed. 
LIRIODENDRON SIMPLEX, n. sp. 
PL..LXIL., Fics. 2, 3, 4. 
Leaves 3 to 4 inches in length, long-petioled, ovate-lance- 
olate in outline, from 1 inch to 2 inches in width at. =the 
broadest part ; summit emarginate, wedge-shaped ; nervation fine, 
but distinct, midrib strong, terminating abruptly in the sinus of 
the summit; lateral branches forming two sets, the first and 
larger being separated by intervals of about one quarter of an inch, 
branching near their extremities, and anastomosing to form a 
coarse net-work along the border; the spaces between these 
