Tfetle 7. — Location, number and duration of attacks "by the drills, and food 

 organisms involved, for tank 3, Experiment II 



1/ 2/ 



A: species attacked — B: location — C: duration of attack in days 



1/ M = mussels; C = clams; = Olympia oysters; P = Pacific ojs ters. 

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



13 



