210 Proceedings of the Royal Society of Victoria. 



have been observed to a depth of 150 feet vertically from the 

 surface in West Australia. 



The diameter of tiie perforations at the Vale of Coolgardie 

 Mine ranges from ^ to ^ inch. The tunnels are very tortuous 

 and branching. 



At the Hill End Mine near Broad Arrow, at a depth of 70 

 feet vertically from the surface, the country rock in which the 

 auriferous quartz reef runs resembles that at Bayley's Reward 

 Mine in the quarry. It is also well tunnelled ; there is no joint 

 here in the rocks as at the Vale of Coolgardie Mine. 



Whether these very remarkable perforations are the work of 

 worms, larvae or flies is quite uncertain, but by calling attention 

 to these curious "deep sinkings," miners may become interested 

 and so secure examples of the pioneer miners that have executed 

 so much work befoi-e the gold miner reached Western Australia. 



It is not known if these burrows are still being extended or 

 not, nothing to indicate very recent work was observed. 



