82 THE FLORA OF THE AMBOY CLAYS. 
straight, terminating in the bottom of the sinus of the upper extremity, 
lateral nerves nearly straight, parallel, forming two series, the stronger ones 
separated by intervals from 6"™" to 12" 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, however, they are sufficient to determine 
the general form and nervation. Their resemblance to the leaves of the 
living species, L. tulipifera, is striking, 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 infrequently, however, we find two 
and sometimes three points on a side, and a much nearer approach to the 
form of the leaves before us. The leaves of the living species are, how- 
ever, always shorter, and relatively broader, yet the resemblance on the 
whole is so close that it is impossible to avoid the conclusion that we have 
in these Cretaceous leaves relies of the progenitor of the living species, 
with all the more important characters of form and nervation already 
distinetly specialized. 
Locality: Woodbridge. 
Genus LirrtopenpRopsts Newberry gen. nov. 
Leaves ovate, oblong, or lanceolate, petiolate, base wedge-shaped or 
rounded, summits broadly emarginate, margins entire, sometimes undulate 
or slightly constricted to almost nddle-shaped; nervation crowded and fine, 
but distinct, midrib slender, generally flexuous, terminating in the bottom 
of the apical sinus; secondary nerves leaving midrib at a large angle, 
uniting in festoons near the margins; tertiary nervation distinct, filling the 
space between the secondary nerve-branches with a rather fine network; 
meshes elongated near the midrib, rounded or polygonal near the margins. 
[ have thought it best to distinguish by a new generic name a group 
ot leaves which are numerous in the Amboy Clays and the Atane beds of 
Greenland. They have been hitherto included in the genus Liriodendron 
