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. 



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 

 hosts of a very much smaller copepod, Pseudocalanus elongatus (p. 

 291), which added very little to the volumes of the hauls. The Calanus 

 component agrees more closely, numerically, with the plankton vol- 

 umes (p. 286). The total counts of copepods are not a fair index to 

 regional richness or poverty', as feeding grounds for pelagic fishes. 



