(7°) 
thetic type of uncertain botanical affinities, with mostly cori- 
aceous leaves, it has not been considered available. The 
only Raritan leaf with which our specimen may be com- 
pared is Tikaephyllum dubtum,* which it resembles in its 
cordate outline, delicate venation, and thin texture; like the 
Raritan leaf ours is represented by but a single specimen 
rather poorly preserved. It differs in being larger and in 
lacking the dentate margin, and was apparently equilaterai 
with a straight midrib. In view of the uncertainty of New- 
berry’s determination it is desirable that we should endeavor 
to get an idea of the true botanical affinity of our leaf, which 
it seems to me will place it among those leaves ancestral to 
the modern aspens or poplars. It resembles several species 
of Populus, although the latter are as a rule coriaceous or 
subcoriaceous, for instance Populus Harkeriana Lesq. from 
Staten Island} and the Dakota Group.{ It may be com- 
pared with Populus balsamoides(?) var. latifolia Lesq.,§ 
although the latter is a Tertiary species; the margin is ap- 
parently similar and the venation is strikingly similar except 
at the margin. 
It may also be compared with the Dakota species Populrtes 
Lancastriensts Lesq.|| which it greatly resembles in size and 
outline ; the secondaries are stouter and straighter in the latter 
and the basal one is less branched. 
FAGACEAE. 
Quercus Linn. Sp. Pl. 994. 1753. 
About two hundred existing species of the northern hemi- 
sphere,{/ more than fifty of which occur in North America. 
The extinct American species number about 127, distributed 
* Newb. Fl. Amboy meee for pl. rs. 
StS 
+ Hollick, Ann. N. Y. d. Sci. 11: 419. Ai 36.Ff. 8. 
t{ Lesq. Fl. Dak. is me pl. $6. f. 4 
Rf. 7. 
rete by Ettingshausen from Tertiary of New Zealand. (Trans. 
N. Z. Inst. v. 2: 
