NO. 8 INTERRELATIONSHIPS OF THE CETACEA WINGE 35 



the margin ; a form which is not only unique among the cetacea, but 

 the contrary to the forms found among the most primitive cetacean 

 genera." 



Phoccuna is, besides, a httle broad-snouted porpoise, rather evenly 

 developed in all directions. A few small teeth may be present in the 

 intermaxillary. 



Neomeris (Neophoccena) is nearly related to Phoccena. It differs 

 in having acquired a yet shorter and broader face, in having a notice- 

 ably spacious braincase, and in lacking the dorsal fin, which it doubt- 

 less has lost. 



Delphinidae.™ 



I. Atlas and axis mutually free. 



A. Face long and narrow, not flattened. 



EURHINODELPHINI. 



1. Intermaxillary (undoubtedly) not specially elon- 



gated in front of maxillary. 



1. Face not noticeably elongated. 



Delphinodon. 



2. Face noticeably elongated. 



a. Teeth with slight traces of less simple 



forms, 

 a. Crowns of teeth partly with remains 

 of lateral cusps. 

 Champsodelphis . 

 /?. Crowns of teeth without lateral 

 cusps. 

 Schizodelphis. 



b. Teeth purely conical. 



Heterodelphis. 



2. Intermaxillary with tip produced far forward in 



front of maxillary. 

 Eurhinodclphis, Argyrocetus. 



B. Face relatively short, broad and flat. 



MONODONTES. 



1. Several teeth present in each jaw, none of them 



especially enlarged. 

 Delphinapterus. 



2. Almost toothless, a single tooth in the upper jaw of 



males a gigantic ramming-tooth. 

 Monodon. 



