﻿308 
  Mr. 
  D. 
  M. 
  S. 
  Watson 
  on 
  

  

  All 
  these 
  features 
  are 
  found 
  in 
  Cotylosaurs, 
  many 
  of 
  tliem 
  

   also 
  inTemnospondylous 
  Steoocephalia, 
  and, 
  taken 
  together, 
  

   render 
  it 
  certain 
  that 
  the 
  Therapsid 
  group 
  was 
  derived 
  from 
  

   a 
  Cotylosaurian 
  reptile. 
  

  

  When 
  comparing 
  together 
  the 
  remains 
  of 
  Texas 
  reptiles 
  

   in 
  Munich^ 
  I 
  was 
  very 
  much 
  impressed 
  by 
  the 
  many 
  resem- 
  

   blauces 
  (some 
  only 
  of 
  a 
  very 
  su|)erficial 
  character) 
  between 
  

   Varanosaurus 
  and 
  the 
  Captorhinidte. 
  These 
  may 
  be 
  listed 
  

   as 
  follows 
  : 
  — 
  

  

  1. 
  The 
  triangular 
  skull, 
  with 
  a 
  much 
  narrowed 
  preorbital 
  

  

  region. 
  

  

  2. 
  The 
  deflected 
  pi'cmaxillary 
  dentigerous 
  border, 
  so 
  that 
  

  

  the 
  incisor 
  teetii 
  are 
  inclined 
  backwards. 
  

  

  3. 
  Tlie 
  identical 
  arrangement 
  of 
  the 
  bones 
  of 
  the 
  face. 
  

  

  Compare 
  especially 
  the 
  lachrymal 
  reaching 
  the 
  septo- 
  

   maxilla 
  in 
  each, 
  Tiie 
  long, 
  straight, 
  antero-posteriorly 
  

   directed 
  sutures 
  between 
  the 
  prefrontal 
  and 
  lachrymal 
  

   and 
  the 
  frontal. 
  The 
  entrance 
  of 
  the 
  latter 
  bone 
  into 
  

   the 
  orbital 
  margin 
  for 
  a 
  very 
  short 
  distance, 
  &c. 
  

  

  •1. 
  The 
  fact 
  that 
  the 
  squamosal 
  is 
  the 
  important 
  bone 
  in 
  

   the 
  temporal 
  region, 
  the 
  rudimentary 
  supratemporal 
  

   in 
  Captorhinus 
  occupying 
  an 
  exactly 
  similar 
  position 
  

   to 
  that 
  o£ 
  Va?'anosaiirus. 
  

  

  5. 
  The 
  apparently 
  identical 
  relations 
  of 
  the 
  quadrate 
  to 
  

   the 
  squamosal. 
  

  

  C). 
  The 
  epipterygoids 
  are 
  similar 
  in 
  the 
  two 
  types. 
  

  

  7. 
  The 
  articulation 
  of 
  the 
  end 
  of 
  the 
  paroccipital 
  process 
  

  

  with 
  the 
  squamosal. 
  

  

  8. 
  The 
  vertical 
  position 
  of 
  the 
  postparietals 
  = 
  interparietal. 
  

  

  9. 
  The 
  heavy 
  stapes 
  articulating 
  with 
  a 
  fenestra 
  ovale 
  

  

  placed 
  so 
  low 
  dowai 
  that 
  the 
  lower 
  edge 
  is 
  in 
  contact 
  

   with 
  the 
  basisphenoid, 
  only 
  just 
  above 
  and 
  behind 
  the 
  

   tubei'a 
  basisphenoidales. 
  

  

  10. 
  The 
  absolute 
  identity 
  of 
  the 
  basisphenoid 
  in 
  the 
  two 
  

  

  types. 
  

  

  11. 
  Tlie 
  presence 
  of 
  a 
  long 
  strong 
  parasphenoid 
  in 
  both. 
  

  

  [Shown 
  very 
  clearly 
  in 
  a 
  Munich 
  specimen 
  of 
  Xwi^Wo- 
  

   sawus.^ 
  

  

  12. 
  The 
  heavy 
  and 
  slightly 
  swollen 
  neural 
  arches 
  and 
  

  

  horizontally 
  placed 
  articulating 
  facets 
  of 
  Varanosaurus 
  

   recall 
  those 
  of 
  Labidosaurus 
  more 
  than 
  any 
  other 
  

  

  type- 
  . 
  ., 
  . 
  , 
  

  

  13. 
  The 
  resemblance, 
  almost 
  amounting 
  to 
  identity, 
  between 
  

  

  the 
  cartilaginous 
  shoulder-girdles. 
  [I 
  only 
  know 
  

   Labidosaurus 
  in 
  not 
  very 
  Mcll-preserved 
  material.] 
  

  

  