161° 160° 159° 158° 157° 156° 155° I54°I6I° 160° 159° 158° 157° 156° 155° 154° 



zy ■ 



20° ■ 



HUGH M SMITH CRUISE 10 

 7/I9-7/3I/5I 



I f— 



HUGH M SMITH CRUISE 12 ,5 

 10/23- II/3/5I 



161° 160° 159° 158° 157° 156° 155° I54°I6I° 160° 159° 158° 157° 156° 155° 154° 



22° 



19° ■ 



HUGH M SMITH CRUISE 17 

 9/5-9/15/52 



161° 160° 159° 158° 157° 156° 155° 154° 



FIG. 10. LINES OF EQUAL ZOOPLANKTON 

 ABUNDANCE, BASED ON TIME-ADJUSTED 

 VOLUMES, FOR THREE CRUISES OF 

 THE HUGH M. SMITH 



29 



