Fig. 1. 
“2, 
eb m2): 
EXPLANATIONS OF PLATE XV. 
PHYLLOGRAPTUS TYPUS, page 119. 
An extremely short and broad form of this species, with the axis broad, and 
showing some remains of the cellules at the base of the separated division. 
An elongate-ovate form of stipe, with a broad axis, which does not show 
remains of cellules. Some of the cellules in the upper part of the stipe are 
filled with iron pyrites. 
. A form similar to the preceding, showing remains of cellules on the upper 
part of the axis. 
. An elliptical form of stipe, where two of the divisions have been separated 
leaving the bases of two sets of cellules. 
. A broadly elliptical form, from which two of the divisions and the axis have 
been removed; showing the bases of the cellules of the folia which remain 
in the slate. 
. A stipe compressed in the same direction as fig. 3 of the generic illustrations 
page 119; with a part of one of the folia removed, but not reaching to the 
axis. The lines of the cell-partitions appear as if continued across the 
axis. 
. An elongate-lanceolate form of stipe, which does not show cellules in the 
line of the axis. 
. An elongate-elliptical and very symmetrical specimen, showing the marks of 
cellules along the axis, which is unusually narrow. 
. A part of a stipe folded in the manner of fig. 6, the upper portion of one side 
preserving only the impression of the substance. In the lower part, the 
cell-markings on the axis should be shown more distinctly. 
. A group of small stipes upon the surface of a piece of shale. These are given 
in their natural size and in their actual relations to each other. 
. An enlargement of a part of an impression of a stipe which has been flattened 
in the direction of figs. 6 and 9. A portion of the substance remains, as 
shown on the left hand; the cellules filled with iron pyrites. 
An enlarged portion from a stipe, showing the double cell-denticles and 
corresponding cell-partitions. The narrow spaces on the surface of the 
figure are more elevated than the wider ones, with a greater thickness 
of the substance; which I suppose may have been caused by the cell- 
partitions, which are obliquely compressed, thus showing the cell-denticles. 
These elevated spaces become gradually narrower towards the axis, in 
accordance with the form of the cells, as shown in the theoretical figure 10 
plate xvi. 
