ifeble 2. — Location, number and duration of attacks by tne drills, and food 

 organisms involved, for tank 1, Experiment I 



A: species attacked ■=■' B: location y C: duration of attack in days 



Drill 1st 2nd 



number attack attack 



A-B-C A-B-C 



3rd 

 attack 



A-B-C 



4th 

 attack 



A-B-C 



5th 

 attack 



A-B-C 



6 th 

 attack 



A-B-C 



M-Il-4 



\l M = mussels; C = clams; = Olympia oysters; P = Pacific oysters. 

 2/ Gives column and row where attack took place (see figure 4). 



