The Cainozoic System in Victoria contains a true _Nautilus, N. geelongensis_; and _Aturia australis_ (Fig. 106 E), a nautiloid shell having zig-zag suture lines and septal necks enclosing the siphuncle. _A. australis_ is also found in the Oamaru Series of New Zealand; in Victoria it has an extensive vertical range, from Balcombian to Kalimnan (Oligocene to Lower Pliocene). Species of _Nautilus_ are also found in the Janjukian of the Murray River Cliffs; where, in some cases the shell has been infilled with clear gypsum or selenite, through which can be seen the tubular siphuncle in its original position. _Spirulirostra curta_ (Fig. 106 F) is an interesting cuttle-bone of rare occurrence. The genus is represented by two other species only, occurring in the Miocene of Italy and Germany. In Victoria it is occasionally found in the Janjukian marly limestone at Bird Rock near Torquay. COMMON OR CHARACTERISTIC FOSSILS OF THE FOREGOING CHAPTER. PELECYPODA. _Ambonychia, macroptera_, Tate. Cambrian: S. Australia. (?) _Modiolopsis knowsleyensis_, Chapm. L. Ordovician: Victoria. _Orthonota australis_, Chapm. Silurian (Melbournian): Victoria. _Grammysia cuneiformis_, Eth. fil. Silurian (Melbournian): Victoria. _Leptodomus maccoyianus_, Chapm. Silurian (Melbournian): Victoria. _Edmondia perobliqua_, Chapm. Silurian (Melbournian): Victoria. _Cardiola cornucopiae_, Goldfuss sp. Silurian (Melbournian): Victoria. _Panenka gippslandica_, McCoy sp. Silurian (Tanjilian): Victoria. _Ctenodonta portlocki_, Chapm. Silurian: Victoria. _Nuculites maccoyianus_, Chapm. Silurian: Victoria. _Nucula melbournensis_, Chapm. Silurian (Melb.): Victoria. _Palaeoneilo victoriae_, Chapm. Silurian (Melb.): Victoria. _Pterinea lineata_, Goldfuss. Silurian (Yeringian): Victoria. _Lunulicardium antistriatum_, Chapm. Silurian (Tanj.): Victoria. _Conocardium costatum_, Cressw. sp. Silurian: Victoria. _Conocardium davidis_, Dun. Silurian: New South Wales. _Actinopteria boydi_, Conrad sp. Silurian (Yer.): Victoria. _Aviculopecten spryi_, Chapm. Silurian (Melb.): Victoria. _Modiolopsis complanata_, Sowerby sp. Silurian (Melb.): Victoria. _Goniophora australis_, Chapm. Silurian (Yer.): Victoria. _Cypricardinia contexta_, Barrande. Silurian (Yer.): Victoria. _Paracyclas siluricus_, Chapm. Silurian (Melb.): Victoria. _Actinopteria australis_, Dun. Devonian: New South Wales. _Lyriopecten gracilis_, Dun. Devonian: New South Wales. _Leptodesma inflatum_, Dun. Devonian: New South Wales. _Stutchburia farleyensis_, Eth. fil. Carbopermian: New South Wales. _Edmondia nobilissima_, de Koninck. Carbopermian: New South Wales. _Deltopecten limaeformis_, Morris sp. Carbopermian: New South Wales, Queensland and Tasmania. _Aviculopecten squamuliferus_, Morris sp. Carbopermian: New South Wales and Tasmania.