DESCRIPTION OF SPECIES. 
or 
(To) 
FRENELOPSIS GRACILIS Newb. n. sp. 
Pl. XII, figs. 1-3a. 
Branches numerous, long, slender, simple or remotely forked, set at 
distant intervals with small scale-like leaves spirally arranged. 
I have referred this interesting plant to Frenelopsis with some hesita- 
tion, but it seems nearer to the living genus Frenela and its fossil ally 
Frenelopsis than to any other conifer with which it has been compared. 
The tree, when living, with its numerous slender, cylindrical branches, 
of which the leaves were invisible, must have had the general aspect of 
the broom, the tamarisk, Canotia holocantha, and most of all of the Ephedras. 
Locality: Woodbridge. 
Coniferz of Uncertain Affinities. 
THINNFELDIA LESQUEREUXIANA Heer. 
Pl. XI, figs. 1-17. 
Thinnfeldia Lesquereuxiana Heer, Fl. Foss. Arct., Vol. VI, Abth. II, p. 37, Pl. XLIV, 
figs. 9,10; Pl. XLVI, figs. 1-11, 12a, b. 
{n the Cretaceous Flora (p. 54, Pl. I, fig. 12) Mr. Lesquereux describes 
an “oval, oblong leaf, tapering from below the middle to a short, thick 
petiole, abruptly rounded, and undulate above.” This he called Phyllo- 
cladus subintegrifolius. It was obtained from the Dakota sandstone near 
Decatur, Nebr., and in the Upper Cretaceous rocks of Greenland leaves 
were found in considerable numbers which are apparently identical with 
this. They have been so considered by Professor Heer, who has figured 
and described them (FI. Foss. Arct., Vol. VI, Abth. I, p.37, Pi. XLVI, figs. 
1-11), and has given them the name of Thinnfeldia Lesquereuxiana, deciding 
that they can not be conifers, as supposed by Lesquereux. Now we have 
to report the discovery in the Amboy Clays of some hundreds of leaves 
which are apparently identical with those from Greenland, and presumably 
so with those from Nebraska.’ A number of these are figured on PI. XI, 
‘In the Flora of the Dakota Group, PI. II, figs. 1, 2, 3, leaves are figured under the name Phyllo- 
cladus subintegrifolius Lesq. which are considered by Dr. Knowlton to be identical with Thinnfeldia 
Lesquereuxiana Heer. As the true relationships of the plant are yet problematic, it has seemed to 
be the wiser course to allow the name adopted by Dr. Newberry to stand for the specimens found in 
the Amboy Clays, which may eventually be determined to be distinct from those of the Dakota 
group.—A. H. 
