At various beaches on the south, south-east, north, and north-west coasts of Australia, remains of Decapoda more or less encased in clay-nodules, are every now and then brought to light, but very few facts appear to have been gathered as to their mode of occurrence when in situ. Again, similar, animal remains have been met with in excavating canals in delta deposits, on]y in such instances they are less markedly nodular, and have undergone a lesser degree of fossilisation. A third occurrence is that of river, or perhaps estuarine, deposits brought to Iight through dredging operations.
As an instance of the first mode of occurrence we cite Anson Bay, North-west Australia; of the second the Coode Canal, Yarra River Delta; and of the third dredging operations carried on at the mouth of the Brisbane River, Moreton Bay. All of these occurrences will be referred to later.