SHRIMPS AND PRAWNS. 



75 



edge of the frame and the "bottom, as it is dragged 

 along by a rope, either lowered from a boat or attached 

 to a horse. The extreme end, or purse gf the net, is 

 made to untie like the mouth of a bag as at b, which 

 greatly facilitates the removal of its contents when 

 overhauling is needed. The two rings, c c, serve to 

 attach the drag rope to. 



An apparatus constructed much on the same general 

 principles, and known as the keer drag, is also in much 

 use. A beam of wood and a set of " yoJce lines " serve 

 to keep the body of the net distended, and the purse is 

 secured wdth a few turns of twine. The dredge we have 

 figured and described may have a much shorter hag of 

 very strong network attached to it, if the nature of the 

 ground dredged over, and the kind of productions 

 sought, should render it necessary. The net we have 



