﻿AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  

  

  31 
  

  

  Fie. 
  3. 
  

  

  Fig. 
  4. 
  

  

  NOTHOSAURUS 
  ? 
  ANDKIANI. 
  

  

  External 
  nostrils 
  posterior. 
  

  

  Pubes 
  entering 
  acetabulum, 
  transverse, 
  united 
  medially. 
  

  

  Vertebrae 
  with 
  zygapophyses 
  only. 
  

  

  Bibs 
  single-headed. 
  Chevron 
  bones 
  present. 
  

  

  SAUROPTERYGIA. 
  

  

  