NO. 9 MARINE INVERTEBRATES, ALASKA — MacGINITIE 87 



tive than if placed loose in the trap. Thus encased it could be fastened 

 to the trap wherever desired. 



Holes were made at the following localities, the depths given being 

 the depth of the water from the upper surface of the ice to the ocean 

 bottom : Near shore, at 7 feet ; one-half mile from shore, at 2 1 feet ; 

 three-fourths mile or more, at 37 feet; 1.25 miles, at 64 feet ; 1.6 miles, 

 at 80 feet ; i .8 miles, at 80 feet. In all instances the bottom was muddy 

 at the depths investigated. 



The traps were attached to ropes and lowered to the bottom. When 

 pulling them up for examination, the ice that had formed over the 

 surface of the hole had to be chopped away and dipped out with a 

 sieve-dipper. Then the rope, which had frozen to the side of the ice 

 near the top of the hole, had to be chipped free before the trap could 

 be pulled to the surface. If possible, to prevent the animals from 

 freezing in the air, the trap was examined without withdrawing it 

 entirely from the water, and the specimens were hastily transferred to 

 a large container, such as a 5-gallon thermos jug, for transportation 

 to the laboratory. During the coldest weather the jug had to be 

 wrapped in insulating material to prevent the contents from freezing. 



In the following log, unless otherwise stated, the traps were always 

 placed on the bottom. 



Table 6. — Log of trapping through ice 

 DEPTH 7 FEET. ICE 3 FEET THICK 



