152 DISCOVERY REPORTS 



Between six and seven thousand larvae have been examined in this analysis of vertical 

 distribution. As might be anticipated, Calyptopis i is in greatest abundance, and the 

 group made up by Furcilia 5 and 6 has the smallest number of individuals in it. It is 



TIML 1400-iaOO 



FIRST CALYPTOPIS 



T 



cr 750-500 



SECOND CALYPTOPIS 



IP 



THIRD CALYPTOPIS 



O 500-250 



t 



0200-0600 



iTt 



T 



nT+ 



Fig. 72. Diagram showing diurnal vertical migration in Calyptopis 1-3 of Euphausia superba. 



difficult to say how greatly the difference in number is due to the superior efficiency of 

 the 70-cm. net in catching Calyptopis as compared with the larger larvae, and to what 



