BEHAVIOUR OF THE AMAZON DOLPHIN 91 



Fig. 33. 



Piranha ( Serrasalmus piranha) caught in the Rio Mamoré lagoon (Beni). 

 (Photo Pilleri. February, 1968.) 



Fig. 34. 



Lower jaw of Inia geoffrensis (young and older animal) from Beni. Bolivia. 

 (From the Colleetion of the Brain Anatomy Institute, University of Bern.) 



