([MarrHew] PALÆOZOIC ROCKS OF SOUTHERN NEW BRUNSWICK 91 
Sir Wm. Dawson in his figures of the Devonian Arthrostigma 
indicates the occurrence of irregularly placed branches on the internodes 
of the stem*; we have not found traces of such branches on the stems 
of the Beaver harbour species, they may however come with the irregu- 
lar dichotomy noted in some stems. Arthrostigma has flexible leaves, 
those of Ramicalamus are rigid; another point of distinction from the 
latter genus is that it had only one circlet of leaves and branchlets at the 
nodes while Ramicalamus had several. 
PTERIDOSPEMS. 
The plants above described occur in a bed of very fine grained shale, 
and in association with them are certain rather stout stems that may 
indicate a species of Psilophyton, but we have seen no seed vessels of 
that genus, and so are unable definitely to refer there, these stems, 
which by surface appearance, are referable to the trunks of that genus. 
There are, however, indications, of another group of plants which 
as observed in later strata occur in association with genera of the Car- 
boniferous type. These fossils owing to the coarseness of the matrix 
are not in good preservation, and they are of somewhat rare occurrence. 
In the same beds are numerous branching roots of vascular plants which 
indicate species that so far have escaped observation. One filicoid 
plant, whose leaves have the venation of Archæopteris, or Aneimites, 
is the most common, and there is another that may be compared to 
Eremopteris. These rare leaves occur on luted surfaces of a sandstone 
bed above that containing Himantophyton; this and Arthrostigma are 
found in a bed of fine gray shale, once a bed of fine gray mud in which 
they appear to have grown and been entombed. The few leaves of 
filicoid plants however occur in an overlying sandy shale, but only on a 
few smooth surfaces of fine clay, as though these leaves, eddying down 
from the stems on which they grow, had been caught by the water of 
little puddles resting on the sandy clay of the wet flat on which they were 
imbedded and so were preserved, while those exposed on the bare sand, 
perished. 
Physical aspect of the Silurian rocks in southern Charlotte and 
St. John counties. 
Much interest centres in the early Paleozoic floras, with their 
strange forms of vegetation, once thought to be largely composed of 
Ferns and Filicoid plants, but which one after another have been found 

1 Ibid. Pl, XIII, Fig. 146, 148, 150. 
