MARINE BIOLOGICAL STATION ON PUFFIN ISLAND. 29 



Chicken Rock (depth thirty fathoms), which yielded large 

 numbers of polyzoa. These have been examined by 

 Mr. Lomas, who tells me that they include Cellaria 

 fistulosa (very abundant) and C. sinuosa (new to ''Fauna"), 

 Cellepora dichotoma, Stoinatopora major and S. johistoni, 

 Tuhidipora lohulata and T. flahellaris, and a number of 

 common forms. 



At this spot also, it being the deepest water on our 

 homeward track, we let the electric lamp down to the 

 bottom in a tow-net (see fig. on page 40) twice, and got 

 gatherings, consisting mainly of Copepoda, Sagitta, Amphi- 

 poda, Zoeas, and other larval forms. 



That free-swimming Crustaceans are attracted to a 

 stationary net by the electric light may now, after our 

 experiments of 1888 and on this last cruise, be considered 

 established beyond doubt ; and that the illuminated tow- 

 net can be used in at least moderately deep water was 

 evident to all who saw the success w^ith which the net 

 was worked on board the '' Hyaena" in thirty fathoms. 



The submarine electric light is, therefore, an important 

 addition to the collecting methods of the marine biologist, 

 and one which ought certainly to come into extensive use 

 in the future. It is, of course, only very rarely that a 

 vessel like the ''Hyaena," so fitted up that the electric 

 light can be turned on readily at any time to illuminate a 

 series of nets, is placed at the use of the biologists, and to 

 fit out a boat specially with an engine and dynamo and a 

 set of lamps, would be a very expensive matter. I thought 

 at one time that storage batteries might serve the 

 biologist's purpose, but on making inquiries in Liverpool 

 we found that for even a day's work a considerable 

 number of batteries would have to be taken, and the 

 expense would be too great. The plan of sending a 

 primary battery down in the net, as in the case of the 



