252 



WHALES 



While this method is appHcable to Odontocetes, Breathnach showed in 

 1955 that in Mysticetes, and probably also in Archaeocetes, the brain was 

 surrounded by so many large vascular net\vorks that the plaster casts can 

 no longer be held to provide anything like exact replicas of their brains. 

 Hence, very little can be said about them, at least until further facts come 

 to light. 



