190 ROYAL SOCIETY OF CANADA 
ridges noted by Sir William and some stems have scars of leaves (or 
prickles?) mostly in rows along the middle of the stem. 
One example of a curved, woody peduncle, about 20 mm. long, was 
observed, to spring from the side of a subsidiary branch near its origin; 
this carried a strong rib (double at the base) and may have been a 
fruiting branch. Other fruiting branches are terminal and ramose, 
looking something like the fertile branches of Aneimites Acadica, Dn. 
At intervals on some branches are scars of branches or large leaves 
that have been detached, they resemble the scars on the areole of stems 
of Lepidodendron, but no areole is visible. Occasional stems or stolens 
show a circular scar as in Stigmaria, and about three of these may 
occur together, with then longer intervals that are free of scars. From 
these scars rootlets or leaves may sometimes be seen to extend after the 
manner of Pinnularia dispalans of the older flora at St. John. Often 
in these flattened stems or stolens when smooth, a woody axis may b2 
traced curving from side to side of the stem, to reach points of attach- 
ment of the rootlets above described, and where a scar marks the attach- 
ment of an appendage, either rootlet or branch. When the vascular 
axis Tuns straight along the middle of the stem, as it often does for 
considerable distances, the stem then resembles Psilophyton glabrun, 
Dn., of the Little R. group. 
PsILOPHYTON ROBUSTIUS, Dawson. 
Main stem 20 mm. wide, principal branches 5 to 10 mm. wide. 
Surface as compressed in the shale undulate with irregular discontinuous 
ribs, which may run for a length of 80 mm. Surface finely striate 
longitudinally. Stems which show frequent alternate branches at a 
wide angle are to be placed with this species. 
The leaves of this species are not distinguishable from those we 
have referred to P. princeps; it also has similar ultimate branches, but 
no areoles were observed on them; however, an adjoining layer has 
branches or stolens with areoles. Scars observed on other stems are 
evidently due to the wrenching of the stem’s surface from a level to am 
oblique position by the flattening in the shale of branches which have 
stood out at different angles around the stem. 
PSILOPHYTON ELEGANS, Dawson? 
Stem 5 mm. wide and having longitudinal short striæ, and some 
longer impressed lines at intervals. There are circular scars on some 
stems or stolens for the attachment of leaves or rootlets, these may be 
single or in groups of two or three along the middle of the stem, and 
