NOTES ON A COLLECTION OF TERTIARY LIMESTONES. 
on the surface inland from Fitzmaurice Bay.” Mr. Kershaw’s 
discovery of the same limestone series at the Seal River is therefore 
additional to the previous records. 
During a recent expedition Mr. E. B. Nicholls obtained specimens 
of a limestone of similar age to the above, and largely composed of 
polyzoa, which he collected on the east coast, 8 or 9 miles south 
of Sea Elephant River. This also is a new locality. The specimens 
have been presented by Mr. Nicholls to the Museum. 
General Description. 
One variety of the limestone from the Seal River is of a pale 
ochreous colour, fragmental in structure and of a friable nature. 
Hand specimens of this rock are seen to consist chiefly of polyzoa 
with occasional shells of pectens and other mollusca. It bears a 
strong resemblance to certain beds of polyzoal rock at Waurn 
Ponds, Batesford, and Torquay. 
A harder limestone, associated with the polyzoal rock, is yellow 
to pink in colour, close textured, and occasionally cavernous, with 
a tendency to the development of crystalline calcite in the hollows. 
This rock, like the former, contains much polyzoa and numerous 
echinoid spines. In its hard texture and pink colour it is closely 
comparable with the compact limestone of the beds occurring in 
association with the older basalt on the banks of the Moorabool 
River, near Maude (W.T.M. 2 and 4 in Nat. Mus. Coll.). 
A microscopical examination of thin sections of the friable 
limestone (PL VII., fig. 5) shows the same organic constituents as 
the compact rock, with the exception that the former has a liberal 
proportion of clear calcitic cement between the individual grains, 
whilst the hard limestone has a cement of the nature of a dense 
pinkish-brown calcareous mud (PI. VII., fig. 6). 
DESCRIPTION OF THE FOSSILS. 
THALLOPHYTES. 
Boring (?) Fungi. 
Palaeachlya tuberosa, sp. nov. 
(Plate VII., Fig. 4.) 
Some of the shell fragments in the pink limestone were seen 
to be perforated by a parasitic boring organism. Remains of this 
kind are frequently met with in both recent and fossil shells and 
corals, as well as in fish-scales, teeth, and bones. Certain of these 
are referred to algae, whilst others are regarded as fungi. f It is 
probable that the form herein dealt with is of the nature of a fungus, 
since the thallus is merely constricted and not distinctly septate! 
and has sporangium-like terminations. ' ^ 
* 30th November, 1908. ~ 
| See Seward. Fossil Plants, vol. i., 1898, p. 127. 
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