﻿Cranial 
  Region 
  of 
  a 
  Permian 
  Reptile. 
  

  

  323 
  

  

  jugular 
  foramen 
  is 
  then 
  very 
  similar 
  to 
  the 
  condition 
  found 
  in 
  

   Sphmnodon. 
  

  

  1. 
  

  

  Fig. 
  1. 
  Side 
  view 
  of 
  a 
  cast 
  of 
  the 
  brain 
  cavity. 
  

  

  Fig 
  2. 
  Lower 
  view 
  of 
  the 
  basi 
  sphenoid. 
  

  

  Fig. 
  3. 
  Lower 
  view 
  of 
  the 
  cranial 
  region. 
  

  

  Fig. 
  4. 
  Lower 
  view 
  of 
  the 
  cast 
  of 
  the 
  brain 
  cavity. 
  

   5. 
  The 
  trigeminus 
  nerve. 
  T. 
  The 
  facial 
  nerve. 
  "12. 
  The 
  hypoglossus 
  nerve. 
  

   Ju. 
  The 
  jugular 
  foramen. 
  Ty. 
  Cast 
  of 
  tympanic 
  cavity. 
  Hy. 
  Hypophysis. 
  

   Hy. 
  F. 
  Foramen 
  penetrating 
  base 
  of 
  basioccipital. 
  F 
  0. 
  Fenestra 
  ovalis. 
  I. 
  G. 
  

   Foramina 
  for 
  internal 
  carotids. 
  Eu. 
  Opening 
  of 
  eustachian 
  tubes. 
  Gb. 
  Cere- 
  

   bellum. 
  

  

  