50 Annals of the Carnegie Museum. 



from the John Day formation of Oregon, which is represented only 

 by limbs and feet in the collection of the American Museum of 

 of Natural History. 



Measurements. 



(Type specimen No. 1594, Carn. Mus.Xat. Vert. Foss. ) 



mm. 



Greatest length of skull 883 



Distance from premaxillary to postorbital process of jugal 528 



Distance from postorbital process of jugal to and including occipital 



con dy 1 e 305 



Length of alveolar border of maxillary and premaxillary 465 



Distance from median incisor to Ml 330 



Length of molar series 130 



Antero-posterior diameter of canine, at base 50 



Transverse diameter of canine, at base 55 



Antero-posterior diameter of Pi 37 



Transverse diameter of Pi 22 



Antero-posterior diameter of P^ 38 



Transverse diameter of P^ 23 



Antero-posterior diameter of Pi 44 



Transverse diameter of Pi ', 33 



Antero-posterior diameter of Pi 37 



Transverse diameter of Pi 39 



Antero-posterior diameter of Mi 42 



Transverse diameter of Mi 43 



Antero-posterior diameter of Mi 45 



Transverse diameter of M^ 48 



Antero-posterior diameter of Mi 45 



Transverse diameter of 1VP- 45 



Greatest length of mandible 700 



Length of inferior dentition 460 



Distance from median incisor to M T 327 



Length of molar series 142 



Antero-posterior diameter of canine, near base 44 



Transverse diameter of canine, near base 47 



Antero-posterior diameter of P T 37 



Transverse diameter of P T 21 



Antero-posterior diameter of Pj 39 



Transverse diameter of P 2 20 



Antero-posterior diameter of Pj 54 



Transverse d iameter of P3 28 



Antero-posterior diameter of P T 45 



Transverse diameter of P T 30 



Antero-posterior diameter of M T 43 



Transverse diameter of M r 32 



Antero-posterior diameter of M 2 47 



