| 
{ 
: 
BIGELOW: COAST WATER EXPLORATION OF 1913. 329 
Copepods formed the bulk of the quantitative hauls, the more active 
of the larger organisms, e. g., Sagittae and schizopods, being so poorly 
represented even at localities where the qualitative nets yielded large 
hauls of them, that they must have avoided the slow moving quanti- 
tative net ; and our experience in 1912 (1914a) was the same. 
The following counts of copepods were obtained by diluting the 
entire catch to 150 cc.; mixing well, then taking 3 cc. in a pipette 
while the plankton was in suspension, and counting. Each of the 
catches was sampled two or three times, and the results averaged. 
Relative no Total number of 
copepods copepods in a column 
Station in 3 ce. 1 m. in cross section 
10087 101 90500 
10089 62 31000 
10090 Sau 435( 0 
10092 193 96500 
10095 63 31500 
10096 140 70000 
10097 174 87000 
10098 80 40000 
10099 54 27000 
10100 247 123500 
10101 150 75000 
10102 61 30500 
10103 76 38000 
10104 o4 27000 
10105 56 28000 
Average, 53266 
| This table shows that the central part of the Gulf and the waters off 
Mt. Desert Rock were most prolific, numerically, in copepods (Stations 
10092 and 10100); the Stations off Monhegan (10102) and northeast 
of Cape Ann (10104, 10105) the poorest. Thus there is a marked 
discrepancy between the numerical distribution of copepods, and the 
volumes of the quantitative hauls, as outlined above. This is due to 
the fact that besides the adult Calanus, the more prolific hauls contain 
-nosts of a very much smaller copepod, Pseudocalanus elongatus (p. 
291), which added very little to the volumes of the hauls. The Calanus 
»omponent agrees more closely, numerically, with the plankton vol- 
ames (p. 286). The total counts of copepods are not a fair index to 
egional richness or poverty, as feeding grounds for pelagic fishes, 
