38 NATURALISTS’ ASSISTANT. 
which affect such places. Sometimes, instead of having a 
beam.” the trawl has two “ wings’? made of wood and 
loaded on one edge so that they maintain an upright position. 
These wings are attached to the rope after the fashion of a 
kite so that the passage through the water forces them widely 
apart. In this form, the upper edge of the net should be 
floated with cork. 
The tangle, fig. 15, is another piece of apparatus for 
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marine collecting and is useful for obtaining such bottom 
forms as are covered with spines. It consists of an iron bar, 
having on each end a wheel. ‘To the bar are attached about 
half a dozen chains, each chain having every few inches 
bunches of hemp or untwisted rope. Such animals as the 
Starfish, Brittle-stars and Shrimps, become entangled in the 
bunches and are thus brought to the surface. 
Another method of obtaining forms from the bottom is by 
pumping. ‘This was first employed by Meyer and Mobius in 
