A--Lichas australis, McCoy. Silurian (Yeringian). Victoria B--Odontopleura jenkinsi. Eth. fil. and Mitch. Silurian. N.S. Wales C--Encrinurus punctatus, Brunnich sp. Silurian. N.S. Wales. D--Phacops sweeti, Eth. fil. and Mitch. Silurian. N.S. Wales E--Phacops serratus, Foerste. Silurian. N.S. Wales ] In New South Wales trilobites are abundant in the Yass district, amongst other localities, where the upper beds, corresponding to the Yeringian of Victoria, are well developed. _Dalmanites meridianus_ is common to the Silurian of New South Wales, Victoria, and Tasmania. In Victoria this handsome species is found in the hard, brown, sandy mudstone of Broadhurst's and Kilmore Creeks, and, as previously noted, in the hard, blue mudstone of Wandong. At the latter locality specimens may be found in the railway ballast quarry, where they are known to the workmen as "fossil butterflies." The species also occurs at the famous fossil locality of Hatton's Corner, Yass; at Bowning; and at Limestone Creek, all in New South Wales. Other trilobites occurring in the Silurian of New South Wales are _Odontopleura jenkinsi_, _O. bowningensis_, _Cheirurus insignis_ and _Phacops latigenalis_ (Fig. 109 D). In the Wangapeka series of New Zealand the calcareous shales and limestones of the upper division contain _Calymene blumenbachii_, _Homalonotus knightii_ and _H. expansus_. =Devonian Trilobites.--= Trilobites suddenly became rare in the Australian Devonian. The only known examples of trilobite remains belong to a species of _Cheirurus_ occasionally found in the Middle Devonian limestone of Buchan, Victoria; and a species of _Proetus_ in the Devonian of Barker Gorge, Napier Range, West Australia. =Carbopermian Trilobites.--= Trilobites of Carbopermian age are found in New South Wales, Queensland, and Western Australia. All the genera belong to the family Proetidae. The genera _Phillipsia_ (_P. seminifera_, Fig. 111 A), _Griffithides_ (_G. eichwaldi_, Fig. 111 B), and _Brachymetopus_ (_B. strzelecki_, Fig. 111 C) occur in New South Wales. _Griffithides eichwaldi_ is also found in Queensland. Other Queensland species are _Phillipsia woodwardi_, _P. seminifera_ var. _australasica_ and _P. dubia_. _Phillipsia grandis_ is found in the Carbopermian of the Gascoyne River, Western Australia. [Illustration: =Fig. 111--CARBONIFEROUS TRILOBITES and a PHYLLOPOD.= A--Phillipsia seminifera, Phillips. Carboniferous. N.S. Wales B--Griffithides eichwaldi, Waldheim. Carboniferous. N.S. Wales C--Brachymetopus strzelecki, McCoy. Carboniferous. N.S. Wales D--Estheria coghlani, Cox. Triassic. N.S. Wales ] =Phyllopoda in Carboniferous, Triassic and Jurassic.=