﻿304 
  Mr. 
  D. 
  M. 
  S. 
  Watson 
  on 
  

  

  The 
  posterior 
  part 
  of 
  each 
  ramus 
  is 
  well 
  preserved. 
  

  

  The 
  artieular 
  is 
  a 
  large 
  bone 
  ; 
  its 
  condyle 
  is 
  damaged 
  by 
  

   excessive 
  development, 
  but 
  it 
  must 
  have 
  greatly 
  resembled 
  

   that 
  of 
  Dimetrodon. 
  There 
  is 
  no 
  appreciable 
  postarticular 
  

   process. 
  The 
  outer 
  surface 
  of 
  the 
  bone 
  is 
  completely 
  

   covered 
  by 
  the 
  surangular, 
  which 
  is 
  separated 
  by 
  visible 
  

   suture. 
  The 
  inner 
  surface 
  is 
  to 
  a 
  large 
  extent 
  covered 
  by 
  

   the 
  prearticular, 
  which, 
  however, 
  does 
  not 
  touch 
  the 
  sur- 
  

   angular, 
  so 
  that 
  a 
  sharp 
  narrow 
  ridge 
  of 
  articular 
  is 
  visible 
  

   from 
  below. 
  

  

  [I 
  think 
  it 
  probable 
  that 
  a 
  considerable 
  part 
  of 
  the 
  present 
  

   outer 
  surface 
  of 
  the 
  surangular 
  was 
  formerly 
  covered 
  by 
  the 
  

   angular, 
  which 
  may 
  have 
  been 
  stripped 
  off 
  during 
  develop- 
  

   ment.] 
  

  

  Atlas. 
  

   The 
  intercentrum 
  of 
  the 
  atlas 
  is 
  well 
  preserved 
  ; 
  it 
  forms 
  

   a 
  short 
  broad 
  band 
  across 
  the 
  basioccipital 
  condyle, 
  whose 
  

   posterior 
  outer 
  corners 
  carry 
  ribs. 
  The 
  neural 
  arches 
  of 
  the 
  

   atlas 
  and, 
  I 
  think, 
  but 
  am 
  not 
  sure, 
  a 
  proatlas 
  are 
  present, 
  

   very 
  much 
  crushed. 
  

  

  VertehriB. 
  

  

  One 
  feature 
  of 
  the 
  vertebrae, 
  already 
  described 
  by 
  

   Dr. 
  Broili, 
  deserves 
  to 
  be 
  emphasized 
  ; 
  this 
  is 
  the 
  relative 
  

   heaviness 
  of 
  the 
  neural 
  arches 
  and 
  the 
  fact 
  that 
  the 
  articu- 
  

   lating 
  faces 
  of 
  the 
  zygapophyses 
  are 
  horizontally 
  placed. 
  

  

  Ribs. 
  

  

  The 
  ribs 
  appear 
  to 
  have 
  been 
  holocephalous 
  throughout 
  

   the 
  column, 
  with, 
  perhaps, 
  the 
  exception 
  of 
  a 
  few 
  anterior 
  

   pairs. 
  Some 
  of 
  the 
  ribs 
  in 
  the 
  region 
  of 
  tlie 
  pectoral 
  girdle 
  

   are 
  flattened 
  and 
  expanded, 
  like 
  those 
  of 
  many 
  cotylosaurs. 
  

  

  Pectoral 
  Girdle. 
  

  

  The 
  cartilaginous 
  part 
  of 
  the 
  left 
  side 
  of 
  the 
  shoulder- 
  

   girdle 
  is 
  very 
  well 
  preserved, 
  except 
  for 
  the 
  upper 
  end 
  of 
  the 
  

   scapula. 
  

  

  It 
  is 
  extraordinarily 
  like 
  that 
  of 
  Ophiacodon 
  as 
  figured 
  by 
  

   Williston. 
  

  

  The 
  scapula 
  is 
  a 
  broad 
  thin 
  bone, 
  thickened 
  at 
  its 
  poste- 
  

   rior 
  edge, 
  rising 
  from 
  the 
  border 
  in 
  the 
  powerful 
  process 
  

   which 
  supports 
  the 
  anterior 
  part 
  of 
  the 
  glenoid 
  cavity. 
  The 
  

  

  