NOTES ON A COLLECTION OF TERTIARY LIMESTONES. 
the above-described form, but which differs, in the very limited 
length of the tubes, their swollen ends, and occasional bifurcation. 
It is worthy of notice that Professor Duncan, in his paper previously 
referred to, figures some very diverse forms under his diagnosis of 
Palaeachlya perforans, and that one of his examples, from a Tas- 
manian Tertiary coral (Thamnastraea) is distinct from our species in 
that the tubes are excessively slender, long, and tortuous.* P. 
tuberosa also occurs in shell fragments in the limestone of the 
Moorabool Valley at Maude. 
In the pink limestone ; Seal River. 
Marine Alge—RHODOPHYCEZ. 
LITHOTHAMNIUM SP. 
Minute fragments of this calcareous alga were seen in thin sections 
of both limestones, but were too imperiect to compare with any 
Tertiary examples already described. They belong to a ramose 
form, since a terminal fragment was observed, showing the charac- 
teristic curved and divergent series of cells. The cells from a well- 
developed branchlet showed a height of -034 mm. and a width of 
°019 mm. 
FORAMINIFERA. 
GLOBIGERINA ci. BULLOIDES, d’Orbigny. 
(Plate VI., Fig. 1.) 
G. bulloides, d’Orbigny, 1826, Ann. Sci. Nat., vol. VII., p. 277, 
No. 1.—Modeles, Nos. 17 and 76. 
G. bulloides, d’Orb., Brady, 1884, Rep. Chall., vol. IX., p. 593, 
pl. Ixxvi., bxxix., figs. 3-7. 
A nearly median section of a Globigerina shell occurs in a thin 
slice of the hard pmk limestone. Its test is moderately thick, and 
from the regular helicoid form, it appears to be referable to G. bulloides. 
This species has been recorded by Mr. Howchin irom the Muddy 
Creek (lower) beds (Balcombian), Waurn Ponds (Janjukian), and 
Mount Gambier (Barwonian). 
TRUNCATULINA LOBATULA, Walker and Jacob, sp. 
Nautilus lobatulus, Walker and Jacob, 1798, Adams’ Essays, 
Kanmacher’s Ed., p. 642, pl. xiv., fig. 36. 
Truncatulina lobatula, W. and J. sp., d’Orbigny, 1839, Foram. 
Canaries, p. 134, pl. 11., figs. 22-24. 
One example, with unusually well-inflated chambers, was found 
in washings from the polyzoal limestone. 
This species has,been recorded by Mr. Howchin from the older 
beds of Muddy Creek, the Government Well at Murray Flats, the 
Government! Bore at Kent Town, Adelaide, and from the west end 
of Torrens Lake, Adelaide, the last in comparatively younger strata. 
* Q. J. G.S., vol. xxxii., 1876, pl. xvi., fig. 1. 
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