Jukes on Australia. 
381 
inability of the whole series of rocks here described and their 
gradual transition from one into the other. They evidently form 
part of one great and continuously deposited formation. 
From a collection transmitted by Mr. Clarke to the Woodwar- 
dian museum of Cambridge, I have been permitted, by the kind¬ 
ness of Professor Sedgwick, to select the following fossils in 
addition to those already mentioned. They come chiefly from the 
valley of the Hunter; the vegetable remains from the coal-mea¬ 
sures at Newcastle; but I do not know the precise geological or 
geographical locality of the other fossils. 
Plants. 
Glossopteris Browniana. Pecopteris australis. 
Vertebraria indica. Phyllotbeca australis. 
Animals. 
Pavosites gothlandica. 
One species of Crinoides, appa¬ 
rently related to Platycrinus. 
A form belonging to the Kadiata, 
and resembling an Echino- 
derrn. 
A small Trilobite. 
Two new species of Spirifer. 
Two species of Leptsena. 
A Terebratula. 
A Eurydesma. 
An Inoceramus. 
A Pleurotomaria. 
And a Conularia. 
2, On the south-eastern portion of Tasmania. 
The two principal rock-masses of the south-eastern portion of 
Tasmania are a very massive rudely columnar greenstone, and the 
sandstone of the palaeozoic formation. The igneous rocks vary 
from a crystalline dark greenstone, through fine-grained basalts, 
to a coarse cellular trap or scoriaceous lava-like pumice. The 
sandstones contain interstratified beds of clay, shale, and loose 
sand, as also of limestone and coal. 
From the want of a good physical map on a sufficiently large 
scale, and of time for a detailed examination of the country, I am 
unable to draw any section of any portion of Tasmania, or even 
to give an accurate and positive description of the order of 
superposition of the stratified rocks, or of their relations with the 
igneous rocks. 
The interior of the country is rugged and broken, with many 
