2 
The occurrence of Trilobites 
have not yet been detected, my friend, Mr. MacLeay, acquaints 
me that he has recently recognized the first fossil crustacean found 
in Australia, a macrourous decapode,”.“ nearly allied to 
Tlialassina,” &c. [This specimen was found by one of the offi¬ 
cers of H.M. exploring ships, on the north coast of New Holland.] 
In the recently-published work of Count de Strzelecki, (1845) 
that author enumerates amongst the fossils of his “ second epoch” 
—“ Impressions of Trilobites, not exceeding half an inch." 
This is all that has been announced in Europe, so far as I know, 
respecting the occurrence of Trilobites in New South Wales. 
But in the year 1843 it was stated, in an article in the Sydney 
Morning Herald, that the author of this notice had discovered 
specimens of those crustaceans, but the locality was not men¬ 
tioned. The date of my first finding these Trilobites was 2nd 
December, 1842. They occurred in a micaceous sandy mud¬ 
stone, or shale, on the right bank of the Paterson River, at a spot 
called Burragood. Associated with them were Spirifers, Orthides, 
a Mytilus, and abundance of fragments of encrinital stems of dif¬ 
ferent species. The size of the Trilobites, of which I found several 
species, chiefly Trinuclei, varied from that mentioned by Strze¬ 
lecki to that of an inch. In the beginning of 1845 I again 
searched the same locality, and was rewarded by the discovery of 
other species, and amongst them of an Asaphus. Mr. MacLeay 
has honoured me by calling one species Trinucleus Clarkii. The 
Trinucleus is the characteristic genus of Trilobite in the Lower 
Silurian formations. 
During the present month (May, 1846) Capt. P. P. King, R.N. 
has shown me a rock similar to that of Burragood, from the neigh¬ 
bourhood of the Murrumbidgee, and not far from Queanbeyan, in 
the county of Murray, and at a linear distance, S.W. from 
Burragood of more than two hundred English miles. The rock 
there literally swarms with Trilobites, some of them Asaphi, others 
Trinuclei. They were discovered by Terence A. Murray, 
Esq., M.C. (who gave them to Captain King,) at an elevation of 
about two thousand feet above the sea, in beds of great inclina¬ 
tion ; and Mr. Murray informs me that similar deposits exist near 
Mount Murray, at an elevation of nearly five thousand feet. 
