EXPLANATION OF PLATES 



PLATE 22 



Fig. 1. Front view of self-closing horizontal towing net. The net is 

 set for descent, with both jaws in the upper position. 



Fig. 2. Same view with net oi^en, ready for towing. The first mes- 

 senger rests upon the inner trip which has released the lower jaw and 

 allowed it to fall to the lower position. 



[342] 



