C--Tetragraptus serra, Brongn. sp. L. Ordovician. Lancefield, Vict. D--Didymograptus bifidus, J. Hall. L. Ordovician. Guildford, Vict. ] (3) Castlemaine Series. Characterised by _Didymograptus bifidus_, _D. caduceus_ and _Loganograptus logani_. _Phyllograptus_ persists from the Bendigo Series. It also contains _Tetragraptus serra_, _T. bryonoides_, _T. quadribrachiatus_, _Goniograptus macer_ and several _Didymograpti_. (4) Darriwill Series. Characterised by _Trigonograptus wilkinsoni_. Also contain _Diplograptus_, _Glossograptus_ and _Lasiograptus_, whilst _Didymograptus_ is rare. =Lower Ordovician Graptolites, New Zealand.--= In New Zealand Lower Ordovician Graptolites are found in the Kakanui Series, at Nelson, north-west of South Island. Some of the commoner forms are _Didymograptus extensus_, _D. caduceus_, _Loganograptus logani_, _Phyllograptus typus_, _Tetragraptus similis_ and _T. quadribrachiatus_. Graptolites agreeing closely with those of the Lancefield Series of Victoria occur near Preservation Inlet in the extreme South-west, and have been identified as _Clonograptus rigidus_, _Bryograptus victoriae_ and _Tetragraptus decipiens_. =Upper Ordovician Graptolites, Victoria.--= The Upper Ordovician rocks of Victoria, as at Wombat Creek and Mount Wellington in Gippsland, and at Diggers' Rest near Sunbury, contain the double branched forms like _Dicranograptus ramosus_, _Dicellograptus elegans_ and _D. sextans_; the sigmoidal form _Stephanograptus gracilis_; and the diprionidian (biserial) forms as _Diplograptus tardus_, _Climacograptus bicornis_, _Cryptograptus tricornis_, _Glossograptus hermani_ and _Lasiograptus margaritatus_ (Fig. 75). [Illustration: =Fig. 75.--UPPER ORDOVICIAN and SILURIAN GRAPTOLITES.= A--Dicranograptus ramosus, J. Hall sp. Up. Ordovician. Victoria. B--Dicellograptus elegans, Carruthers sp. Up. Ordovician. Victoria. C--Diplograptus carnei, T. S. Hall. Up. Ordovician. N. S. Wales. D--Climacograptus bicornis, J. Hall. Up. Ordovician. Victoria. E--Glossograptus hermani, T. S. Hall. Up. Ordovician. Victoria. F--Retiolites australis, McCoy. Silurian. Keilor, Victoria. G--Monograptus dubius, Suess. Silurian. Wood's Point, Victoria. ] =Upper Ordovician Graptolites, New South Wales.--= In New South Wales, at Tallong, the Upper Ordovician Graptolites are well represented by such forms as _Dicellograptus elegans_, _Dicranograptus nicholsoni_, _Diplograptus carnei_, _D. foliaceus_, _Cryptograptus tricornis_ and _Glossograptus quadrimucronatus_, etc. Other localities in New South Wales for this Graptolite fauna are Stockyard Creek, Currowang, Tingaringi, Lawson, and Mandurama. =Tasmania.--= From Tasmania a _Diplograptus_ has been recorded, but the particular horizon and locality are uncertain. =Silurian Graptolites, Victoria.--=