1878. ] 329 [Lesquereux. 
nerves and intermediate nervilles more or less immersed into the epidermis. 
These leaves are inserted around small branches upon tumescent 
small bolsters, whose disposition is in regular spiral, with a rhomboidal 
section recalling those of the Lepidodendron, but formed by the fleshy 
base of laterally decurring leaves like those of some Conifers. He adds 
that the leaves of one of his species, D. Gallicwm, do not seem to have been 
caducous, some remains of them are generally seen even upon the oldest 
branches, where they have not left any distinct scars. The coaly envelope 
of the branches is thick, the foliaceous bolsters are soon effaced upon it, 
as if the bark had increased in thickness in contact witha ligneous increas- 
ing body, as in the dicotyledonous. 
The description of the stems and of the rhomboidal scars placed in spiral 
and left upon the branches, and also the fig. 3, of a branch, in Pl. XIV of 
his flora, corresponds in part with the characters of the cone or branch 
described above. But the leaves of Dicranophyllum are of a different 
character from that of the Cordaites, and, therefore, the author has sepa- 
rated this genus from the order of the Cordaites. 
The organism, which from its leaves I consider as a Dicranophyllum, 
differs in many points of the above description, but some of its characters 
are so clearly corresponding that I do not find reason to separate them. It 
will be seen, however, that from our specimens, the relation of the specics 
is truly to the Cordaites, and that the genus cannot be separated from this 
order. 
DICRANOPHYLLUM DIMORPHUM, Sp. nov. 
Pl. LTV, fig. 1-2. 
Stems or branches small, the largest seen not quite two centimeters 
wide, when flattened ; apparently articulated at the point of divergence of 
the branches and there abruptly narrowed, covered with a coaly bark about 
half a millimeter thick; stem leaves in oblique or right angle to the 
branches, narrow, three millimeters broad near the inflated smooth base 
at the point of attachment, linear or slightly diminishing toward the upper 
part, where they are forking once or twice, covered with a thick epidermis 
wherein the veins are buried and obtuse ; nerves distinct under the epider- 
mis, four or five primary ones near the base. unequally distant, inter- 
mediate ones indistinct or not perceivable with the glass. The stem, fig. 
2, is marked upon the bark by round, small, inflated bolsters, correspond- 
ing under it to small cavities of the same form and size, very irregular in 
their distribution, sometimes three placed directly in line, sometimes 
scattered. Ido not consider them as scars of leaves ; they are probably the re- 
mains of small mollusks like those which so profusely inhabit the substance 
of the leaves of Cordaites. The top of the same fig. 2 which is not fig- 
ured, bears a reniform scar like those of Cordaites costatus, but it is proba- 
bly that from a top leaf like those of fig. 1. 
The stem, fig. 1, seems like articulate by a depression across its whole 
diameter at the point of attachment of the branch 1a. The top of this 
PROC. AMER. PHILOS. soc. xvit. 101. 20. PRINTED MARCH 27, 1878. 
