This pair, the goatfish ahead, the yellowtail following, foraged together for days in succession. 

 There is a "slippery Dick" (Iridio bivittatus) as well as a second goatfish and a parrot fish in the 

 picture. Some of the difficulties encountered by the submarine photographer are well illustrated in 

 this case. On account of absorption of light by the water, one is obliged to use a wide stop in taking 

 snapshots. As a result, to be sharply in focus objects must be all nearly in one plane. Since the 

 fishes are at perfect liberty to come and go, it is often necessary to wait a long time before the de- 

 sired configuration appears. Taken in about ten feet of water 



Porkfishes and tang 

 in the foreground 



86 



against a background of massive coral; sea urchin and sea fan out of focus 



