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BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



PHYLOGENY OF ODONTOCETES. 



Ziphius 

 Oligodont-pseudoheterodont 

 Pmx and Mx edentulous. 



k 

 S 



^ 



Inia, Pontoporia 

 Polyodont-homodont. 



Phocaena, Neomeris 

 Polyodont-heterodont, 

 Pmx dentate. 



Mesoplodon 

 Oligodont-pseudoheterodont 

 Pmx edentulous, Mx with rudimentary 

 teeth in the gums. 



Ziphirostrum 

 Polyodont-pseudoheterodont 

 Pmx edentulous, Mx with functional 

 teeth. 



Eurhinodelphis 

 Polyodont-homodont 



Pmx edentulous, Mx with functional 

 teeth. 



Delphinus, " Cyrtodelphis," 

 Polyodont-homodont, last vestiges of 

 heterodont dentition among Delphin- 

 oids. 



Saurodelphis 

 Polyodont-pseudohomodont. 



Neosqualodon, Squalodon 

 Polyodont-heterodont, Pmx dentate. 



Microzeuglodon. 

 Oligodont-heterodont, 

 Pmx dentate. 



