MARINE MISCELLANEA. 



251 



distinct ramifications. The specimens from this place have evidently the structure 

 of stalactites, which seem to have been formed in the sand." The tubular character 

 of some of the examples of these and similar stalactite-like concretions collected, and 

 their attribution to the passage of calcareous or ferruginous solutions through the 

 sand masses of which they are fundamentally composed is further referred to at pages 

 621 and 622 of the same treatise. 



The photograph here reproduced depicts this peculiar strata under conditions more 

 favourable for the illustration of its characteristic features than obtained at the epoch 

 of its earlier observation. Sweer's Island, when visited by the writer in 1891, had a 

 few years previously been the scene of a violent hurricane. The low sandstone cliff that 

 forms the subject of the accompanying photograph, then taken, had been completely 

 submerged and undermined by the abnormal waves, and was broken up into disrupted 

 fragments that bore a by no means remote resemblance to masses of a Cyclopean 

 growth of the Organ-pipe coral, Tubipora musica. 



W. Sarillt-Eent, PJioto. 

 STALACTITE-LIKE HOCK CONCRETIONS, SWEER'g ISLAND, GULF OF CARPENTARIA, NORTH QUEENSLAND. 



