174 
closely allied fern. In speaking of the Australian specimens as Cladophlebis 
denticulata, var. australis , I have adopted a course which may not find favour 
with my co-workers. It has already been pointed out that such a pinnate type 
of frond as that represented by Cladophlebis denticulata has a world-wide 
distribution in mesozoic floras, and among recent ferns the same type recurs 
in several genera. The slight variations in the form of the pinnules, the 
occasional occurrence of fine denticulations, as in most of the English examples 
of Brongniart’s species, or the apparently entire margin of the lamina, as in 
the Victorian fragments, are, I believe, of insufficient importance to serve as 
marks of specific distinction. Seeing that there is—as I think—no satisfactory 
reason for definitely separating the Australian from the European species, and 
on the other hand admitting the possibility or even probability that this 
bipinnate type of leaf may have been borne by ferns specifically or even generi- 
cally distinct, by adding the name australis to Brongniart’s species Cladophlebis 
denticulata , we state the fact that this particular example of Cladophlebis agrees 
with the fern referred to by various authors as Alethopteris australis , and at the 
same time belongs to that group of fronds of which C. denticulata represents 
the central or standard form. 
Fig. 25 (163, allotment 53a, Jumbunna).—Part of a pinna ; pinnules 
1.5cm. in length. The forked secondary veins are clearly shown on the lamina 
from which the carbonaceous film has been removed (Fig. 25a). 
Fig. 26 (180, allotment 32a, Kongwak).—A portion of a pinnule 9mm. broad, 
in which the veins are very clearly preserved. 
Fig. 27 (166, allotment 53a, Jumbunna).—The longest pinnule has a length 
of 4cm. ; the venation, which is clearly seen in places, agrees with that of 
Fig. 26. Compare Stirling, (99) PL 2, Fig. 3. 
Localities. —McKenzie’s coal seam, allotment 53a, Jumbunna ; allotment 
32a, Kongwak; Welshpool. 
Other Specimens. —152, 154, and 158, allotment 53a, Jumbunna (with 
152 and 154 the broader form of Tceniopteris also occurs). 174, Welshpool; 
190, allotment 32a, Kongwak. 
GENUS THINNFELDIA, ETTXNGSHAUSEN. 
Thinnfeldia McCoyi, sp. nov. 
Fig. 28. 
The specimens on which this species is founded are fragments of what is 
presumably a fern frond characterized by broad and obliquely pointed pinnules 
with decurrent lower margins, and having the Neuropteris type of venation. 
Each segment is traversed by a midrib, which dies out near the apex, and from 
which dichotomously branched secondary veins are given off at an acute angle. 
A somewhat similar form of leaf is figured by Raciborski* from Poland as 
Thinnfeldia (?)Haiburnensis , but, so far as it is possible to judge from small 
and imperfect specimens, the type represented in Fig. 28 appears to be a form 
not hitherto described. 
Fig. 28 (149, allotment 53a, Jumbunna).—Part of a pinna 6cm. long ; the 
most complete pinnule is 2.5cm. in length, and 1.5cm. broad. 
Localities. —McKenzie’s coal seam, allotment 53a, Jumbunna ; allotment 
32a, parish of Kongwak. 
* Raciborski (94), PI. XX., t igs. 3-6. 
