In the Silurian shales at Keilor, in Victoria, _Monograptus_ is a common genus, and _Cyrtograptus_ and _Retiolites australis_ (Fig. 75 F) also occur. Several species of _Monograptus_ have also been found at South Yarra and Studley Park. At the latter place and Walhalla _Monograptus dubius_, which is a Wenlock and Ludlow fossil in Britain, has been found in some abundance (Fig. 75 G). * * * * * COMMON OR CHARACTERISTIC FOSSILS OF THE FOREGOING CHAPTER. SPONGES. _Protospongia_ sp. Cambrian: S. Australia. _Hyalostelia_ sp. Cambrian: S. Australia. _Protospongia oblonga_, Hall. L. Ordovician: Victoria. _Stephanella maccoyi_, Hall. L. Ordovician: Victoria. _Carpospongia_ sp. Silurian: Yass, New South Wales. _Receptaculites fergusoni_, Chapman. Silurian: Victoria. _Receptaculites australis_, Salter sp. Devonian: Victoria and New South Wales. Carboniferous: Queensland. (?) _Lasiocladia hindei_, Eth. fil. Carbopermian: Queensland. _Purisiphonia clarkei_, Bowerbank. Lower Cretaceous: Queensland. _Geodia_ sp. Cainozoic: W. Australia. _Tethya_ sp. Cainozoic: W. Australia. _Ecionema newberyi_, McCoy sp. Cainozoic: Victoria. _Plectroninia halli_, Hinde. Cainozoic (Janjukian): Victoria. _Tretocalia pezica_, Hinde. Cainozoic (Janjukian): Victoria. ARCHAEOCYATHINAE. _Protopharetra scoulari_, Etheridge, fil. Cambrian: S. Australia. _Coscinocyathus australis_, Taylor. Cambrian: S. Australia. _Archaeocyathina ajax_, Taylor. Cambrian: S. Australia. CORALS. _Cyathophyllum approximans_, Chapman. Silurian: Victoria. _Tryplasma liliiformis_, Etheridge, fil. Silurian: New South Wales. _Favosites grandipora_, Etheridge fil. Silurian: Victoria. _Pleurodictyum megastomum_, Dun. Silurian: Victoria. _Halysites peristephicus_, Etheridge, fil. Silurian: New South Wales. _Heliolites interstincta_, Linné sp. Silurian: Victoria. _Campophyllum gregorii_, Eth. fil. Middle Devonian: Victoria and Queensland. _Cystiphyllum australasicum_, Eth. fil. Middle Devonian: New South Wales and Queensland. _Favosites multitabulata_, Eth. fil. Middle Devonian: Victoria and New South Wales. _Pachypora meridionalis_, Eth. fil. Middle Devonian: Queensland. _Zaphrentis culleni_, Eth. fil. Carboniferous: New South Wales. _Lophophyllum corniculum_, de Koninck. Carboniferous: New South Wales. _Zaphrentis profunda_, Eth. fil. Carbopermian: Queensland. _Campophyllum columnare_, Eth. fil. Carbopermian: New South Wales. _Trachypora wilkinsoni_, Eth. fil. Carbopermian: New South Wales. _Stenopora tasmaniensis_, Lonsdale. Carbopermian: Tasmania and New South Wales. _Flabellum gambierense_, Duncan. Cainozoic: Victoria, S. Australia and Tasmania. _Placotrochus deltoideus_, Duncan. Cainozoic: Victoria, S. Australia and Tasmania.