MARINE COLLECTING. 



39 



their investigations of the fauna of the Bay of Kiel. A pump 

 was so arranged that the lower end of the pipe was within a 

 few inches of the bottom, and the forms ' brought up by the 

 current were col- 

 lected by nets and 

 sieves. 



Between the bot- 

 tom and surface 

 other forms may be 

 .found; to collect 

 these a sunken net, 

 first used by Baur, is 

 employed. 



The surface of the 

 sea at times is cov- 

 ered with infusoria 

 {Noctiluca, etc.), 

 jelly fishes, larval E- 

 chinoderms, Worms 

 and Crustacea, Cop- 

 epoda, Salpse, Sa- 

 gittse, etc. To ob- 

 tain these the surface 

 net is employed, 

 fig. 1 6. This con- 

 sists of a ring of 

 brass wire about a 

 foot and a half in diameter, to which is attached a net of 

 fine gauze. This is towed through the water, being frequently 



Tig. 15. 



