﻿382 
  

  

  E. 
  L. 
  Troxell—An 
  Oligocene 
  Camel. 
  

  

  tions, 
  marked 
  off 
  especially 
  by 
  a 
  postero-exterior 
  groove 
  for 
  

   the 
  junction 
  of 
  the 
  stylo-h'yoid 
  bone. 
  This 
  groove, 
  instead 
  of 
  

   following 
  along 
  the 
  bottom 
  of 
  the 
  bulla 
  as 
  in 
  P. 
  wilsoni, 
  leads 
  

   from 
  the 
  original 
  pit 
  upward, 
  leaving 
  the 
  outer 
  portion 
  a 
  pen- 
  

   dant 
  lobe 
  whose 
  upper 
  end 
  envelops 
  the 
  external 
  auditory 
  

  

  Fig. 
  1. 
  

  

  Fig. 
  1. 
  Side 
  view 
  of 
  skull 
  and 
  jaws 
  of 
  Po'ebr 
  other 
  ium 
  andersoni 
  n. 
  sp., 
  

   one-half 
  natural 
  size. 
  

  

  Fig. 
  2. 
  

  

  Fig. 
  2. 
  Skull, 
  base 
  view, 
  and 
  jaws, 
  crown 
  view. 
  One-half 
  natural 
  size. 
  

  

  meatus. 
  This 
  opening 
  is 
  directed 
  upward 
  and 
  backward 
  as 
  it 
  

   leads 
  from 
  the 
  bulla. 
  

  

  The 
  inner 
  parts 
  of 
  each 
  of 
  the 
  bullae, 
  which 
  measure 
  from 
  

   6 
  to 
  9 
  mm 
  in 
  thickness, 
  extend 
  parallel 
  to 
  each 
  other 
  and 
  to 
  the 
  

   longer 
  axis 
  of 
  the 
  skull. 
  They 
  are 
  quite 
  flat 
  except 
  where 
  the 
  

   posterior 
  border 
  ends 
  in 
  the 
  paraoccipital, 
  which, 
  thick 
  at 
  first, 
  

  

  