102 THE FLORA OF THE AMBOY CLAYS. 
In size, general form, and nervation these leaves, of which we have 
compared some hundreds, are closely allied to that figured by Heer CEL 
Foss. Arct., Vol. VII, p. 41, Pl. LXII, fig. 21), but differ from that in having 
the margins sharply denticulate instead of crenate. There can be no doubt 
that they belong te the same genus, however, and to a closely allied species, 
and both are as much like the leaves of Celastrus scandens as they are like 
each other. 
This is one of the most common leaves found at South Amboy, and a 
sufficient number have been drawn to give a good idea of their general 
characters. It will be necessary to have the fruit before any positive state- 
ment can be made in regard to their generic relations, but the form, margins, 
and nervation are so entirely like those of the leaves of some species of 
Celastrus that they will probably be brought very near to, if not united 
with that genus. 
Although plentiful at South Amboy and Sayreville, not a single leaf 
of this species has been found at Woodbridge. The South Amboy beds 
are very near the top of the clay series, and those of Woodbridge near the 
bottom. Hence this plant formed a conspicuous element in the later phase 
of the Cretaceous vegetation in New Jersey. 
Localities: South Amboy, Sayreville. 
CELASTROPHYLLUM UNDULATUM Newb. n. sp. 
Pl. XXXVIII, figs. 1-3: 
Leaves oblong or ovoid, 10% to 15™ in length by 4%™ to 8 in width, 
narrowed to base, obtuse or blunt-pointed at summit, margins undulate or 
coarsely crenate; nervation consisting of a strong midrib, giving off at 
a large angle frequent secondary nerves which run simply or branched to 
the margin; generally they unite in a festoon which follows the outline 
of the undulations. 
This large species resembles Celastrophyllum crenatum Heer, in the 
character of its marginal ornamentation, but the leaves are much longer 
and larger and more oblong. They differ, too, markedly from the leaves 
of C. grandifolium, which are lanceolate and have margins that are finely 
denticulate or undulate. 
