120 LOWER DEVONIAN PLANT REMAINS 
mens (Cookson 1945) as S. chapmani is desirable. For the present 
it seems preferable that they should be considered as remains of 
a simple plant of the same general type as Sporogonites but not 
necessarily identical with that form. 
The Australian species S. chapmam is only known from two 
localities in the Centennial beds at Walhalla. 
2. Zosterophyllum australianum 
Plate IV, Figs. 7-8. 
A few specimens have been recognized as detached sporangia of 
Zosterophyllum australianwm. In size and form these agree with 
sporangia of this plant from the Centennial beds and from Mount 
Pleasant. The most clearly defined specimen is shown magnified 
4 diameters in Plate I, Fig. 7. The sporangium, which has a width 
of approximately 5 mm., is tangentially expanded, and the stalk 
and marginal rim are clearly defined. In this example the spor- 
angium is flattened considerably so that the line of dehiscence is 
directed towards the observer and a portion of the other side of 
the sporangium is visible. 
Another sporangium (Plate IV, Fig. 8) viewed laterally shows 
the line of dehiscence near the summit of the sporangium. 
3. Yarravia cf. oblonga 
Plate IV, Figs. 4-6. 
A few specimens demonstrate the presence in the deposit at Hull 
Road of Yarravia, a synangial fructification originally described 
from the Monograptus beds of the Yarra Track (Lang and 
Cookson 1935). The specimens are flattened incrustations or 
imperfectly preserved casts. In size and general form they agree 
essentially with one of the specimens compared with Yarravia 
from Mount Pleasant (Cookson 1935, Fig. 34). No evidence of 
spores has been seen. 
The example shown at a magnification of 4 diameters in Plate 
IV, Fig. 4, is the best of a small number of specimens collected. 
Its counterpart is represented in Plate TV, Fig. 5. The stem is 
approximately 1 mm. wide and broadens towards the terminal 
fructification which is 3 mm. wide and about 8 mm. long. Three 
linear sporangia are shown on the exposed plane and two of these 
end in tips that are free from one another. The tip of the third 
sporangium on the left-hand side is partly obscured by the matrix, 
but, as far as can be ascertained, this sporangium is identical with 
the other two. For a short distance behind the tips, the brown 
mineral that has replaced the plant tissues is continuous between 
