PALEONTOLOGY. 131 
The extremely long and slender pinne, in which the upper pinnules are frequently largest, 
give it a character quite different from that of any species of this genus from the coal forma- 
tion, and connect it closely with the group mentioned above. 
Associated with Clathropteris of Jurassic affinities, and with the first appearing species of 
the dicotyledonous plants of the Cretaceous epoch, this Pecopteris confirms the inference 
derived from other sources that the lignite bed containing it lies just at the point of junction 
between the Cretaceous and older rocks, and showing a mingling of forms belonging to the 
two formations, proving the impossibility of drawing sharply the lines of division. : 
NEUROPTERIS, Brong. 
NEUROPTERIS ANGULATA, (1. sp.) 
Plate III, fig. 5. 
N. fronde pinnata v. bipinnata; pinnulis orbiculato-ovatis, basi cordatis vel rotundatis, apice 
sub 5 angulatis; nervis raris validisque, in angulis marginis terminantibus. 
Seattered pinnules only of this plant were found in Cretaceous shales lying upon a bed of 
lignite north of Oraybe in the Moqui country. Better specimens may require some modifica- 
tion of the description now given, but the angles of the remote margin of the pinnules distin- 
guish it from any species hitherto described. 
SPHENOPTERIS, Brong. 
SPHENOPTERIS, species. 
Fragments of the frond of a very pretty and distinctly new species of this genus were found 
in the clay bands of the lignite bed at Camp 92, (Moqui villages.) It is most like Sphenopteris 
dichotoma, Alth. from the Zechstein (Newe Pflanz. aus dem Keupershiefer, Palcontographica 1, 
1846, ¢. 4, fig. 1,) but the pinnules are less abruptly truncated, the upper ones being almost 
spatulate. More material is necessary before a satisfactory description can be made of it. 
Another and larger species was detected in the shales overlying another bed of lignite in 
the Cretaceous formation two hundred feet above the last, but the specimens obtained were 
too imperfect for determination. 
PHYLLITES. Sterub. 
PHYLLITES VENOSISSIMUS, (n. Sp.) 
Plate III, fig. 6. 
Ph. folio lineari-lanceolato acuto integerrimo nervo primario valido, nervis secundariis 
paucis, vix conspicuis, arcuatis, apice confluentibus, nervis tertiariis, creberrimis confluentibus. 
The specimens of this leaf which I obtained are too imperfect to form the basis of a satis- 
factory specific description, or to enable us to determine with any certainty its botanical 
affinities. Like the next, however, it is highly characteristic of the formation in which it is 
found, and may have a certain value in tracing the parallelism of strata upon this continent. 
It is only in consideration of this fact that a name and description have been given to it by 
which its identification may be possible. It is from the lignite bed lying just at the base of 
the Cretaceous series at Camp 92, in the Moqui country. It is undoubtedly the leaf of an 
Angiospermous plant, and perhaps of a Salix. 
