230 PROCEEDINGS OF THE GEOLOGICAL SOCTETY. 
of species. A single block of stone, about 10 inches by 6 inches, 
from the Oolite, shows that the deposit from which it was derived 
must have been very fossiliferous; for within this space I have been 
able to detect as many as thirty species, belonging to the genera Ammo- 
mites, Belemmtes, Trigonia, Pecten, Lima, Cucullea, Avicula, Turbo, 
and other univalves, fthynchonella, Teredo, Pentacrinus, &c. The shells 
are crowded upon one another in the greatest abundance, the bivalves 
being generally in single valves, showing that they were probably 
not deposited under tranquil conditions, or that they were not im- 
mediately covered up; and the same may be inferred from the 
somewhat worn character of the fossils, which, in some instances, 
prevents their specific determination. With all the Australian 
Secondary deposits that have come under my notice much drift- 
wood is found; and this, in some instances, has become mineralized 
and converted into iron-ore. The block of stone above mentioned 
contains the impression of a piece of wood which has since perished ; 
but a colony of Pholadide, which had originally burrowed into it, 
still remained, about thirty of the shells, though in bad condition, 
being present. I propose for it the name of Yeredo australis; and 
it appears to be the oldest representative of the genus yet known. 
On examining the series from Western Australia, not only is the 
similarity in lithological character of the beds with those in this 
country to be recognized, but the specific identity of many of their 
fossils cannot be doubted. I was especially gratified at recognizing 
amongst them such typical and well-known forms as Ammonites 
Moorei, Liycett (Pl. XV. fig. 1), A. radians (Pl. XY. fig. 2), A. 
Walcottu*, and Nautilus semistriatus of the Upper Lias, whilst 
A. Brocchii, Belemnites canaliculatus &e., represent organisms from 
the Inferior Oolite. Lima proboscidea and Ostrea Marshii appear to 
have been as abundant as in the hills around Bath; and Pecten cinctus 
from Australia attains the same large proportions as in this country. 
The Cornbrash is apparently represented in Australia by Ammonites 
macrocephalus and Avicula echinata, and the Middle Lias. by the 
Myacites liassianus before mentioned. It should be remarked that, 
as the Australian Oolitic species which are common to this country 
range from the Inferior Oolite to the Cornbrash, and as they are 
mostly found associated in the same rock in Australia, it is possible 
either that some of the species have a longer range, or that our sepa- 
rate divisions may not be there so clearly represented. Nothing is 
yet really known of the sections from which the fossils come. 
It will be seen from the above, that the organic remains have 
enabled me to determine, for the first time, the presence in Australia 
of the faunas of the Middle and Upper Lias and the Lower Oolites ; 
and when I come to the Queensland fossils, equally satisfactory evi- 
dence will be adduced to show that the Upper Oolites are also repre- 
sented on the Australian continent. 
Out of the comparatively small number of specimens that have 
* Another locality in Western Australia, yielding Ammonites, is to the N.N.E. 
of Wizard Peak, the Rev. W. B. Clarke haying sent me photographs of 4. 
radians and A, macrocephalus from thence. 
