250 



BULLETIN OF THE BUREAU OF FISHERIES 



propagation or of invasion (probably of the latter, judging from the scarcity of the 

 species in the preceding February, as shown in the table on p. 299) ; but the rich 

 gatherings of M. Tonga made there during August, September, and October, 1915, 



x 



+ 



Fig 75 -Occurrence of the copepod Mttridia lon 9 a. C locality records, August to January; X, February to June. The 

 hatched curve incloses the area where it has been found in summer and autumn 



are the clearest evidence, short of the actual discovery of breeding adults and of 

 young stages, that active reproduction had been taking place locaUy, because there 

 was nothing in the plankton in general, in the salinity, or in the temperatures of that 



