128 bulletin: museum of comparative zoology. 



with the vessel travelling at such a speed that the wire rope made an 

 angle of about 60°, the same weight (seventy pounds) being invariably 

 used. The catch was placed in jars, killed with formalin, and allowed 

 to settle, usually over night, and then measured for bulk. The Hensen 

 net hauls were preserved entire in formalin, and measured for bulk 

 at Cambridge, being allowed to settle before measurement, until no 

 further visible shrinkage took place. The data of the quantitative 

 hauls are: — 



Station 



Vol. c. c. 



Relative no. of 



2 





25 



239 



4 





5 



104 



7 





6.5 



471 



8 





5± 





11 





2 



30 



15 





1 



11 



21 





1 





22 





3 



97 



25 





8 



125 



28 





3 



25 



31 





3 



20 



35 



only 



a trace 



trace 



36 





3 



50 



38 





2 



24 



43 





1.5 



15 



To obtain the number of copepods, the mass was diluted to 150 cc, 

 well mixed, and while the plankton was in suspension, three cc. taken, 

 by a pipette and counted: most of them were tried twice and the 

 results averaged. The total number of copepods in each haul is not 

 given, but can be easily obtained by a simple calculation. Most of 

 them are Calanus finmarchicus. 



The volumes of the four-foot qualitative hauls (omitting the surface 

 hauls made with this net), in hundreds of cubic centimetres, are: — 



ation 



Volume 



Station 



Volume 



4 



19 



25 



3 



6 



19 



27 



4.7 



7 



9.5 



28 



8 



8 



9.5 



29 



2.5 



11 



4.7 



31 



3 



12 



9.5 



33 



less than 1 



