MIOCENE PORPOISES — KELLOGG 135 



The dorso ventral axis (37 mm.) of the condyle is directed obUquely 

 outward and the external border of the condyle projects beyond 

 the outer face of the ramus. The maximum transverse diameter of 

 the condyle is 25.5 mm. In outline the condyle is almost lachrymi- 

 form with median spur on outer side, and is directed more outward 

 than downward. 



Measurements of the mandibles (in millimeters) 



Right Left 

 Length of mandible, as preserved, condyle to anterior 



end 525.+ 



Length of mandible, as preserved, hinder end of 



corouoid process to anterior end 477.+ 



Length of symphysis (as preserved) 2 10.+ 229.+ 



Vertical diameter of mandible at hindmost alveola 44. 5 42. 5 

 Transverse diameter of mandible at posterior end of 



symphysis 52. 5 



Vertical diameter of mandible at level of posterior end 



of symphysis 29. 5 29. 5 



Transverse diameter of symphysis 50 mm. anterior 



to hinder end 36. 



Transverse diameter of symphysis 100 mm. anterior 



to hinder end 30. 



Transverse diameter of symphysis 150 mm. anterior 



to hinder end 28. 



Vertical diameter of mandible through coronoid 



process 

 12 posterior alveolae in an interval of 

 30 alveolae located in an interval of 

 Anteroposterior diameter of largest alveola 

 Transverse diameter of largest alveola 

 Distance from posterior end of symphysis to posterior 



margin of hindmost alveola 

 Distance from apex of coronoid process to posterior 



margin of hindmost alveola 

 Distance that orifice of dental canal is located behind 



hindmost alveola 

 Distance from posterior end of symphysis to posterior 



surface of condyle 

 Height of condyle 

 Transverse diameter of condyle 

 Distance between alveolae of opposite tooth rows at 



posterior end of symphysis 

 Least distance between alveolae in tooth rows 



Referred Specimen I 



USNM 10715: Right and left mandibles, essentially complete 

 to posterior end of symphysis. Collector, William Palmer, January 

 1914. 



