12 
and Woodend. These hydroids have been long extinct as 
they are confined to the older series of rocks or Palaeozoic 
slates ; they are of the greatest use in determining the zones 
or particular beds over large areas in the search for gold. 
An especially striking form of Graptolite shown here is a 
species of Goniograptus (G. speciosus ) from the last-named 
locality. 
Corals are here shown from Silurian and Permocarboniferous 
strata, one of the more noteworthy specimens being a fine 
polished slab of coral limestone from the Thomson River, 
Gippsland, containing the “ Sunstone Coral ” (Heliolites) 
and the “ Honey-comb Coral ” (Favosites). 
Amongst Tertiary fossil leaves, some of the genus Eucalyptus 
are seen on a rock slab in the Wall-case ; they are interesting 
from the fact that they were embedded in volcanic dust 
showered down from the craters round Warrnambool. Triassic 
and Palaeozoic Ferns and fern-like plants are represented 
by Thinnfeldia from Mount Victoria, and Glossopteris 
Fig. 12. Leaf of Glossopteris Browniana Brongniart. 
Permo-carboniferous of Newcastle, New South Wales (half nat. size). 
from Newcastle, in New South Wales. A fossil tree-trunk) 
Araucarites, from the Stockton Colliery, New South Wales, 
is shown here ; it is probably related to living Australian 
conifers, as Araucaria. One of these tree-trunks, turned 
into flint but with the structure of wood still within it, is 
shown about the middle of the Gallery. 
