192 ROYAL SOCIETY OF CANADA 
and number, and the branches seldom exceed 2 mm. in width. No 
circinate branches were observed. Spore cases are rare; those seen 
were 2 mm. long and 1 mm. wide. Several of the stouter and smoother 
stems have closely placed pits or scars, but no attached or detached 
spines were seen. 
Locality and Horizon.—In olive gray shale and sandy shale at the 
mouth of the Little Pokiok stream in the parish of Brighton, Carleton 
>. 

EXPLANATION OF FIGURE. 
i.—Psilophyton Ellsi. Stem and branches, restored from broken parts of the 
plant. Natural size. 
2,—A sporangium of the same? Mag. 3-1. 
3.—Another sporangium, perhaps of this species. Mag. 3-1. 
Co., N.B. The shales are placed as Devonian by the men of the Can- 
adian Geological Survey. Collected by Dr. R. W. Ells. 
In all Sir William Dawson’s figures and in his descriptions he 
indicates the typical Psilophyton as having a stem marked by distinct 
longitudinal ridges. With the above species we find this feature present 
