252 



it cut deeply into it, the broken part showing quite white, 

 so that it is certainly coral. I tried very hard to pick up 

 a specimen, but having no proper appliance and time being 

 limited unfortunately did not succeed in doing so. Other 

 rocks have been rejDorted in this locality, and many of them 

 are also jorobably coral. The distance is about 40 miles from 

 Port Adelaide, 3 miles off shore, in 9 ft. at low water, and 

 4 or 5 ft. over the rock. The position would not be hard 

 to find, as it is marked by a red buoy and shown on the 

 latest charts." 



I hope that these interesting observations of Captain 

 Weir will lead to this ground being further tested. It is 

 just possible that the large growth seen by Captain Weir 

 will be found to be a mass of Serpula. 



DESCRIPTION OF PLATE XVI. 



From a photograph of a portion of the surface of the coralluni. 

 Natural size. 



