30' 



O COLLEGE STATION 



•• * ,• • 



a • < 



\ 



25°- 



20' 





% 



26° 30' 



GRAND BAHAMA IS. 



\ 



79° 



78° 



_l_ 



95° 



90° 



85° 



80° 



FIGURE 18.— Stations for total Hg in water sam- 

 ples in Gulf of Mexico and off Grand Bahama Island. 



FIGURE 20.— Stations for total Hg in water sam- 

 ples taken in and around the Mississippi Delta. 



30' 



25" 



r 



20' 



95 



90° 



85° 



80° 



FIGURE 19. — Stations for measuring Hg in seliment 

 samples. Gulf of Mexico. 



FIGURE 21. — Locations of zooplankton samples for 

 which the percentage composition of hydrocarbons 

 was measured. 



