A—Hyolithes spryi, Chapm. Silurian (Melb.) Victoria
B—Gyrodoma etheridgei, Cressw. sp. Silurian (Yeringian). Vict.
C—Bellerophon cresswelli. Eth. fil. Silurian (Yeringian). Victoria
D—Euomphalus northi, Eth. fil. sp. Silurian (Yeringian). Victoria
E—Trochonema montgomerii. Eth. fil. sp. Silurian. Tasmania
F—Conularia sowerbii, Defr. Silurian (Yeringian). Victoria
In the Silurian of New South Wales the chief Gasteropod genera are Bellerophon (B. jukesi), Euomphalus, Omphalotrochus, and Conularia (C. sowerbii.).
In Tasmania are found Raphistoma, Murchisonia, Bellerophon, Helicotoma, Trochonema and Tentaculites.
Devonian Gasteropods.—
The derived boulders of the White Cliffs opal field have been referred to the Devonian system, but of this there is some doubt, as the Gasteropods noted from these boulders closely resemble those of the Silurian fauna: they are Murchisonia Euomphalus (E. culleni), and Loxonema. The genus Murchisonia has also been recorded from the Baton River, New Zealand (Wangepeka Series) by MacKay.
The Middle Devonian Gasteropod fauna in Victoria, as found in the Buchan and Bindi Limestones, comprises Murchisonia, Trochus, and Platyceras.