AUSTRALIAN TERTIARY FORMATIONS. 121 
minated in the Miocene period, while Thamnastrea became ra 
r died qut in the Eocene. I have lately discovered a hithane 
Mosaic form in eee, “ which I believe no re Ter- 
tiary species has been hithert 
alliances and a genus with no living form, except one in Batavia, 
and of which a specimen was lately brought down rts Darnle ey 
Island by the Chevert Expedition, and is now in the Macle eay 
us is well represented in the West In 
Miocene, and in the Sindhian, Travancore, and Arabian Miocene. 
It is not at all uncommon in the Bri ghton beds, but there is no 
other o and it has no living or fossil representative in these 
latitudes 
The coast ae of our sae ware Tertiary corals is there- 
fore That Ter iary; between Eocene and Miocene, with strong 
= g 
to the locality in whic they occur, we should find that the Eocene 
forms predominate in the Tasmanian, Muddy Creek, and Schnap- 
per Point formations, while the Miocene forms are more common 
in the beds at Spring Creek, sixteen miles south of Geelong, and 
Portland Bay, Western Vi ctoria. 
With regard to the Echini, a very interesting paper has care 2 
appeared on the subject from Professor Duncan (Quarterl ly 
Journal Geological Society, 1877, p. 42.) He says that this 
order, as represented in our rocks, “is very remarkable as a fossil 
a 
presented gate the genera Cat atopy 28, Holaster, Micraster, and a 
hyncopygus, with the Ananchytic looking apex.” He adds, “that 
the general facies of the whole is older than is eae by the 
geological position.” (p. 68.) I cannot well understand what 
is meant by the “geological position,” for thats is at prepare 
undecided. It must a Pipe me on. the one hand, tha 
wd in our seis aun = se sabigg all ied fy aa 
and the epeciee of the same fete BRE are Sonal is very mark 
re is a ve eat difference between our living nea 
elongata and the fossil ZL. Forbesii. But I have strong reasons 
for believing that L. Forbesii possesses a true peripetalous fasciole, 
in which case it would be a Breynia, and sage closely allied to our 
living Breynia Australasie, Gray. Mavetia anomala,* Duncan, is 
* Professor Duncan mentions this genus as West Indian, but this is pro-. 
bably a misprint for East Indian Islands. 
