320 



bulletin: MVSEIM OF COMPARATIVE ZOOLOGY. 



On the other hand, copepods increased on German Bank from 

 11,000 in May to 21,000 in June, and 41,000 in September; in the 

 western part of the Eastern Basin from 48,000 in May to 173,000 in 

 September; in the Western Basin from 50,000 in May to 104,000 in 

 September; near Mt. Desert Island, from only 1,000 in May to 57,000 

 in October; off Cape Elizabeth from 7,500 in May to 86,000 in October. 



These data point to the waters off Cape Ann and Cape Cod in the 

 west, and off Cape Sable in the east; and to the northern part of 

 Georges Bank, as the richest parts of the Gulf; both for copepods 

 as a whole and for large Calanus (p. 315). But this, does not fairly 

 represent the comparative value of our waters as feeding grounds for 

 pelagic fishes, because it neglects two important groups, amphipods 

 and schizopods, which are not adequately represented in the quanti- 

 tative hauls. Neither of these were of much faunal importance in the 

 Gulf proper (p. 283); but the presence of large numbers of very large 

 amphipods in the waters over the shelf south and southwest of Halifax ; 

 and of swarms of schizopods on Brown's Bank and at Station 10233 

 (p. 283) shows that these localities were more fertile feeding grounds 

 than the small volume of plankton and numbers of copepods would 

 indicate. 



Annual Variation in Amount of Plankton. The volume of plankton, 

 and number of copepods per square meter for corresponding localities 

 in the Gulf for August-September 1913-1915, was as follows: — 



Average 



123 117 63772 61055 



