Figure 34. Skulls of a horse, an Archaeocete (Basilosaurus), an Odontocete [Common 

 Dolphin) and a Mysticete {Fin Whale), illustrating the migration of the nostrils and the 

 telescoping of the cranial bones. Dots - premaxilla ; black - nasal ; vertical lines - frontal ; 

 diagonal lines - maxilla : crosses - parietal ; horizontal lines - occipital. 



