[MATTHEW] PALÆOZOIC ROCKS OF SOUTHERN NEW BRUNSWICK 89 
are scattered promiscuously, though scantily, through the clay (now 
shale). The internal structure of the seeds has not been studied. 
Fruiting bracts.—These are somewhat larger than the seeds, and 
whereas the latter have a minute granulation over their surface, the 
bracts, while having a similar granulation, have the little protuberences 
arranged in rows, thus giving the bract a distinctly striate appearance. 
These bracts have been found in some cases in pairs, as though two 
were required to form the perianth or envelope of the seed. Though 
found in company with the seeds, they have not been found enclosing it; 
the connection of the two is therefore inferential, though both seeds and 
bracts have been found in frequent association with the peduncles of 
the fruiting stems of Himantophyton. 
As only one species of Himantophyton has been determined, this 
description of the species will stand for the genus. 
The leaves of Himantophyton are not usually found in continuous, 
flat examples, but generally undulate, through the shale, so that they 
are not easily traced for long distances. Sir William Dawson’s figure 
of Cordaites angustifolia represents the appearance of these leaves in 
their irregular distribution over the surfaces of the shale.' 
As regards the supposed inflation of the leaves in their living con- 
dition, and that of other species of the early geologic times, attention 
may be called to the description of Psilophyton Ellsi, which appears 
to have been closely allied to the species we are describing. P. Ellsi 
had oval fruits like Himantophyton, but they were of larger size; and 
until we know more of the parts and the life-history of this species from 
northern New Brunswick, it would not be wise to change the generic 
name; it was of a later period than Himantophyton. 
ARTHROSTIGMA ARIETENSE sp. nov. ® 
The stem has a finely striated surface and nodes more or less com- 
plete at intervals of one quarter (7 mm.) to three quarters (20 mm.) of 
an inch; these nodes are not conspicuously marked, and there is little 
thickening of the tissues at this parts of the stem; frequently the 
node is marked by a series of low, small, nodular scars, not always con- 
tinuous across the stem; the node is marked also by the impression of 
short longitudinal lines. It is at these nodes that branches of the stem 
arise, often alternately on opposite sides of the stem, not usually from 
adjacent nodes, but at intervals; these branches themselves possess 
nodes at short intervals and with fewer leaf scars than the main-stem 
nodes. 

1 Foss. plants Devon. & Sil. Can., p. 44, PI. XVI, fig. 163. 
