506 NOTES AND EXHIBITS. 



Palaeozoic radiolaria. The rock of which they constitute by far 

 the larger proportion weathers into a brown pulverulent friable 

 material like bath brick. The unweathered portions are dark 

 bluish-grey and compact. The radiolaria appear to be chiefly 

 referable to the porulose division of the Legion Spumellarvi . 

 This discovery confirms the previous determinations by me of 

 radiolarian casts in the rocks of the New England district, and 

 of the Jenolan Caves, N.S. Wales. The geological age of the 

 formation in which this rock occurs is probably either Devonian or 

 Lower Carboniferous, as Lepldodendron australe appears to occur 

 on a horizon not far removed from that of this radiolarian rock. 

 The Moor Creek limestone, near Tamworth, I find also contains 

 numerous radiolaria. I propose to offer a paper on this subject 

 at the next meeting of the Society." 



