18 
PROCEEDINGS OF THE ROYAL SOCIETY OF QUEENSLAND. 
more triangular, has no sulcus and a less defined area. Both those species, 
which differ from this form in those features, also differ in being 
strongly ribbed on the area. 
Forms of the Indot rig onia type occur later in the Cretaceous 
( Trigonia meridiana Woods, 1917, p. 6, pi. I, figs. 2-7, from the Albian 
of New Zealand is one example). Whether these indicate an extended 
range of the genus or a parallel development is problematical. 
PSEUDOMONOTIS Sp. PI. I, figs. 7, 8. 
A small pteriid lamellibranch is present with the following features : 
The left valve is inflated, ornamented with fine radial costae arranged 
as primary and secondary ribs, and with a small posterior ear. The 
right valve is flat and circular and its ornament is unknown. It is 
best placed in Pseudomonotis. 
The related genus Oxytoma with longer posterior ears is rather 
more common than Pseudomonotis; but although more characteristic of 
Jurassic rocks, Pseudomonotis extends into the Lower Cretaceous, where 
such species as Avicula ( Oxytoma ) tardensis Stanton (1901, p. 14, 
pi. IV, figs. 6, 7) possibly represent it- Immature individuals of 
Maccoyella of the corbiensis group also resemble the pseudomonotids. 
Astarte (?) sp. 
A few very badly preserved specimens may represent this genus, 
but they are too poor for generic determination. 
Panope sp. PI. I, fig. 5a, b. 
There are several fragments and one complete internal mould of 
a Panope. Differences between species in this group are so small and 
variations within a species so great that the few fragments available 
are not sufficient to link it with any described species. The one complete 
specimen figured is very short. But short variants quite like this occur 
in several species (see, e.g., one specimen of P. mandibida Sow. sp., 
figured by Woods — 1909, pi. XXXVII, fig. 5). Similar but unfigured 
short variants are known in the Australian Aptian species P. rugosa 
(Moore). The long range of Panope makes it of little use for delimiting 
the age of the beds. 
One external mould shows extremely faint radial striations from 
umbo to ventral margin in a central zone of the test. Fine radial 
striations or papillations, although rare, are not unknown on the genus. 
Genus Hibolites (Mountfort) Mayer-Eymar 1863. 
Hibolites sp. PI. I, fig. 9. 
There are several impressions of a belemnite but only one (here 
figured) shows the external groove. It is a member of the Hibolites 
group, most possibly Hibolites itself ; but the material is not sufficient 
to determine the species (the one form with a groove showing is the 
youngest individual in the collection ; and the few other fragments are 
not sufficient to determine the variation in shape of the species). Also, 
it is not sufficient to determine whether it may not be a member of the 
closely related genera Mesohibolites Stolley and N eohibolites Stolley. 
Stolley (1919, p. 48) gives the range of these genera as: Hibolites 
(Dogger to Aptian), Mesohibolites (Neocomian and Aptian), N eohibo- 
lites (Aptian to Upper Cenomanian). 
Note. — This paper was written during a period of military leave. 
