10 
Reference may here be made to a cast of the Sauropterygian, 
Thaumatosaurus, affixed to the wall of the South Gallery. 
A cretaceous marine Turtle, Notochelone costata, from 
Flinders River, Queensland, is represented by two well- 
preserved examples. 
Amongst Fishes, the type specimen of Belonostomus 
sweeti, which was an elongate, predatory Ganoid (or armoured 
enamelled scale fish) is shown in the wall-case, along with th e 
Jurassic fish Psilichthys selwyni, from the Western District 
of Victoria. The block of limestone of Miocene age, from 
Batesford, should be noted, for it contains twenty-nine teeth 
of an extinct shark, Isurus retroflexus , besides one other 
genus, Carcharodon, related to the living Great White Shark. 
Fig. 10. Block of Foiiaminiferal Limestone from the Filter 
Quarries, Batesford, near Geelong, with 29 teeth of Isurus 
and 1 of Carcharodon, embedded. 
Amongst shells of Mollusca, or Shell-fish, some specimens 
of fossil Nautilus and their related kinds are exhibited in 
the wall-case ; these include the largest known specimen 
of Aturia, a flattened nautiloid form with curiously 
convoluted septal walls, from Muddy Creek, Hamilton. A 
