9' 
It is interesting to note that, while Antevs refers the specimens to 
Gothan’s proposed genus, Dicroidium, at the same time lie points out that in 
the character of the stomata they agree with Thinnfeldia and not Dicroidium. 
With regard to these two genera, he says : — “ No doubt it would be better to 
exclude the structure of the cuticle from the diagnosis until different forms of 
Dicroidium and Thinnfeldia have been examined in this respect; for there 
may be sufficiently great and numerous differences, all the same, for a separation 
of the two genera.” His remarks only serve to strengthen my opinion already 
expressed, that the evidence available does not justify the separation of the 
genus Dicroidium from Thinnfeldia d 
Thinnfeldia Feistmanteli, Johnston. 
, [For synonymy see Walkom (17), p. 17.] 
“Frond bipinnate, paripinnate with a dichotomous rachis ; apex is 
formed by a dichotomous branching of the rachis. Pinnae elongate, gradually 
tapering, alternate or opposite. Pinnules rhombic, ovate or semi-circular, 
thick, attached by whole of base, and connected by very narrow lamina along 
the rachis. Venation odontopteroid, the veins springing directly from the 
rachis and dividing once or twice before reaching the margin. Similar pin- 
nules occur on the rachis between the pinnae, but. in this position they may 
be slightly contracted at the base. Sori circular, composed of 3 to 5 sporangia. 
Walls of sporangia made up of elongate polygonal cells, and apparently there 
is no annulus.” 1 2 
Normal sterile examples of this species are to be seen in the collections 
from Talbragar, but they are not numerous. The species has recently been 
discussed at some length, 3 and there is no need to do more here than record 
its occurrence at Talbragar. 
Thinnfeldia talbragarensis, n.sp. 
(Plate I, figs. 1,2; Plate II, figs. 7-9.) 
Frond bipinnate. Pinnae variable — some of the same type as T. 
lancifolia, some with markedly wavy margins, and others with the lamina 
distinctly divided after the manner of T. Feistmanteli. Pinnae narrow at base 
and attached to rachis only by narrow portion. The venation in the simple 
pinnae is alet.hopteroid, while in those pinnae resembling T. Feistmanteli, the 
pinnules have the typical odontopteroid venation. 
1 Walkom (17), p. 15. 
2 Q’land. Geol. Surv., Pub. 257, 1917, p. 18. 
1 Walkom (17), p. 17. 
