﻿FEC-M 
  THE 
  KETJPEK, 
  SANDSTONE 
  OF 
  WARWICK. 
  435 
  

  

  EXPLANATION 
  OF 
  THE 
  PLATES. 
  

  

  Plate 
  XXYI. 
  

  

  Fig. 
  1. 
  Mastoclonsaurns 
  pachygnathus, 
  Owen. 
  Orbital 
  region. 
  The 
  restored 
  

   outline 
  of 
  the 
  orbit 
  is 
  indicated 
  by 
  a 
  dotted 
  line. 
  A. 
  Interorbital 
  

   tract: 
  m.g. 
  Mucous 
  grooves, 
  forming 
  part 
  of 
  the 
  lyra; 
  p.f. 
  Parietal 
  

   foramen. 
  B. 
  Postero-external 
  boundary 
  of 
  orbit: 
  a 
  b. 
  Orbital 
  mar- 
  

   gin 
  ; 
  c. 
  Suture 
  ; 
  del'. 
  Malar 
  mucous 
  groove 
  ; 
  Pt. 
  0. 
  Postorbital 
  ; 
  Ju. 
  

   Jugal. 
  

  

  2. 
  Mastodonsaurus. 
  Portion 
  of 
  occipital 
  border 
  ; 
  leftside. 
  A. 
  Superior 
  

  

  surface 
  : 
  Occ. 
  Occipital 
  border 
  ; 
  Ep. 
  Epiotic 
  ; 
  S 
  T. 
  Supratemporal 
  ; 
  

   Sq. 
  Squamosal 
  ; 
  Pa. 
  Parietal 
  ; 
  a. 
  f. 
  Auditory 
  fossa. 
  B. 
  Inferior 
  sur- 
  

   face. 
  C. 
  Posterior 
  surface 
  : 
  p. 
  Pit 
  beneath 
  epiotic 
  plate. 
  

  

  3. 
  pachygnathus, 
  Owen. 
  Posterior 
  part 
  of 
  right 
  ramus 
  of 
  mandible. 
  

  

  A. 
  Side 
  view: 
  k.g. 
  Horizontal 
  mucous 
  groove; 
  d.g. 
  Descending 
  

   mucous 
  groove. 
  B. 
  The 
  same, 
  seen 
  from 
  above 
  : 
  Art. 
  Articular 
  cavity 
  ; 
  

   Pt. 
  Art. 
  Postarticular 
  cavity. 
  

  

  4. 
  , 
  Owen. 
  Outliue 
  of 
  anterior 
  part 
  of 
  right 
  ramus 
  of 
  mandible. 
  

  

  A. 
  Side 
  view 
  (from 
  'Trans. 
  Greol. 
  Soc' 
  2nd 
  ser. 
  vol. 
  vi. 
  pi. 
  44. 
  fig. 
  1). 
  

  

  B. 
  The 
  same, 
  seen 
  from 
  above 
  (ibid. 
  fig. 
  3). 
  

  

  Plate 
  XXVII. 
  

  

  Fig. 
  1. 
  Mastodonsaurus 
  pachygnathus, 
  Owen. 
  Postero-external 
  angle 
  of 
  skull, 
  

   left 
  side. 
  A. 
  Posterior 
  aspect: 
  Art. 
  Articular 
  surface 
  of 
  quadrate; 
  

   Pr. 
  Protuberance. 
  B. 
  Inferior 
  aspect 
  : 
  Q. 
  Quadrate; 
  QJ. 
  Quadrato- 
  

   jugal; 
  ST. 
  Supratemporal. 
  

  

  2. 
  , 
  Owen. 
  Postero-external 
  angle 
  of 
  skull, 
  right 
  side, 
  inferior 
  

  

  aspect. 
  Q 
  J. 
  Quadrato-jugal 
  ; 
  S 
  T. 
  Supratemporal 
  ; 
  Ju. 
  Jugal. 
  

  

  3. 
  Diadetognathus 
  varvicensis, 
  Miall. 
  Part 
  of 
  left 
  ramus 
  of 
  mandible. 
  

  

  A. 
  Side 
  view 
  : 
  h. 
  g. 
  Horizontal 
  mucous 
  groove 
  ; 
  d. 
  g. 
  Descending 
  

   mucous 
  groove. 
  B. 
  The 
  same, 
  seen 
  from 
  above 
  : 
  Art. 
  Articular 
  cavity 
  ; 
  

   Pt. 
  Art. 
  Postarticular 
  process. 
  

  

  4. 
  Mastodonsaurus? 
  Epiotic 
  and 
  adjacent 
  bones. 
  A. 
  Superior 
  surface; 
  

  

  the 
  dotted 
  line 
  represents 
  the 
  supposed 
  position 
  of 
  the 
  occipital 
  border 
  : 
  

   Ep. 
  Epiotic 
  ; 
  S 
  0. 
  Supraoccipital 
  ; 
  Sq. 
  Squamosal 
  ; 
  Pa. 
  Parietal. 
  

  

  B. 
  The 
  same 
  ; 
  inferior 
  surface. 
  

  

  (All 
  the 
  above 
  figures 
  are 
  two 
  thirds 
  the 
  natural 
  size.) 
  

  

  Plate 
  XXYIII. 
  

  

  Fig. 
  1. 
  Teeth 
  of 
  Diadetognathus 
  Varvicensis, 
  magnified 
  10 
  diameters. 
  

   2. 
  Portion 
  of 
  tooth 
  of 
  the 
  same, 
  magnified 
  60 
  diameters. 
  

  

  