Fira. 29. 
Hire. 30. 
Fie. 29. Lateral (A) and Upper (B) aspects of the Skull of an Extinct 
Patagonian River-Dolphin (Argyrodelphis benedent). 
Fie. 30. Corresponding views of the Skull of the Bottle-nosed Dolphin 
(Tursiops twrsio). 
These figures, which are about 2 natural size, show the small size of the 
nasal bones (N) characteristic of the Odontoceti generally. 
[To face page 41, 
