LOWER DEVONIAN PLANT. REMAINS 121 
the sporangia ; in other places it appears to have been broken away 
during the splitting of the stone. It seems probable that here, 
as in the specimens from the Monograptus beds, the elongated 
sporangia were completely coherent in the fructification, only 
their tips having been free. 
The appearance of the specimen illustrated in Plate IV, Fig. 6, 
strongly supports this conclusion. The fructification in this case 
is broader than that of the preceding example and has convex 
rather than straight sides. It is 6 mm. broad and 8 mm. long. 
Three sporangia of equal dimensions can be seen in the exposed 
view of the fructification. Two of these terminate in pointed tips 
identical with the free apices of the previous specimen, the apex 
of the third being hidden by the matrix. 
The specimens from Lilydale agree, both in size and form, more 
closely with Yarravia oblonga than with Y. subsphaerica. There 
are deviations from this type which may possibly be accounted for 
by the different mode of preservation in the two cases. In the 
present state of our knowledge, however, Yarravia cf. oblonga 
seems the best name for the Hull Road specimens. 
4. Hedeia corymbosa 
Plate IV, Figs. 9-11; Plate V, Figs. 12-17. 
The name Hedeia was originally applied to some fertile branch- 
systems, believed to have been radially constructed, from Mount 
Pleasant, Alexandra (Cookson 1935). These were characterized 
by the successive equal or unequal dichotomy of several daughter 
axes which, themselves, arose terminally from the parent axis, and 
by the termination of the ultimate members of the branch-system 
in large elongate-oval sporangia. The tips of the sporangia all 
reached the same level, giving the fructification a corymbose 
appearance. Although some differences in the details of the 
branching were evident in the various examples, all were kept in 
the one species, H. corymbosa. Nothing is known of the plant to 
which such fructifications belonged. 
Several small branch-systems from Hull Road exhibit the 
peculiar type of branching associated with Hedeia, but in none 
of them can the ultimate terminations be clearly recognized as 
sporangia. While uncertainty remains regarding such an impor- 
tant character, specific identification with H. corymbosa cannot be 
established. "ы 
One of the best specimens of this kind, which as regards its mode 
of branching can be closely compared with one of the examples of 
H. corymbosa from Mount Pleasant (loc. cit., Figs. 25, 26), is 
