62 LIVERPOOL BIOLOGICAL SOCIETY. 
run together with perfect ease by the use of a resistance 
of about 0°5 of an ohm in the arc-light circuit. The sub- 
marine lamps are fitted in strong circular annealed glass 
protectors, and can be lowered to any required depth in 
the water by means of a special waterproof flexible cable 
made of 260 strands of fine copper wire, covered with thick 
eutta percha and hemp. The arc lamps require from 
twenty-five to thirty amperes, and the submarine lamps 
4°5 amperes, so that there is ample power when the whole 
installation is running. 
This time the two large electric lamps, 3,000 candle-power 
each, were hoisted up into such a position as to illuminate 
the deck, and cast a bright light on the water for some 
distance on each side of the ship. Three submarine incan- 
descent lamps of 100 candle-power each were then fitted 
in the mouths of tow-nets, and were let down, two of them 
to the bottom, at a depth of five fathoms, and the third to 
a foot or so below the surface of the sea. Hach of these 
nets was put out twice, so that we got four bottom hauls 
and two surface hauls with the electric ight tow-nets. 
Another tow-net without any lamp was let over the side of 
the ‘‘ Hyena,” and lay in the brightly illuminated surface 
water. All these nets were stationary, but were kept 
fairly distended by the tide. At the same time Mr. I. C. 
Thompson was rowed round and round the ship, dragging 
an ordinary tow-net in the bright area, and this one 
haul, in addition to many higher Crustacea, yielded Gastro- 
saccus spinifer, Siriella brooki, and some very interesting 
varieties of Atylus swammerdamu, which Mr. A. O. Walker 
is now working out, and twenty species of Copepoda, 
including such rare forms as Pseudocalanus armatus, Ecti- 
nosoma atlanticum, Zaus spinatus, Laophonte lamellifera, 
Dactylopus tenwirenis, D. tisboides, Cyclopina gracilis, 
Bradya typica, Euterpe gracilis, and quantities of Peltidiwm 
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