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. ¢. Relative no. of copepods 
2 25 239 
4 5 104 
7 6.5 471 
8 o+ 
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 La 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: — 
Station Volume Station Volume 
4 19 25 3 
6 19 27 4.7 
7 9.5 28 8 
S 9.5 29 2.5 
11 4.7 31 3 
12 9.5 33 less than 1 
