﻿18 
  J. 
  W. 
  HULKE 
  ON 
  THE 
  ANATOMY 
  OF 
  HYPSILOPHODON 
  FOXII. 
  

  

  4. 
  Supplemental 
  Note 
  on 
  the 
  Anatomy 
  of 
  Hypsilophodon 
  Foxii. 
  

   By 
  J. 
  W. 
  Htjlke, 
  Esq., 
  F.R.S., 
  F.G.S. 
  (Eead 
  November 
  19, 
  

   1873.) 
  

  

  [Plate 
  III.] 
  

  

  At 
  the 
  close 
  of 
  last 
  Session 
  I 
  read 
  a 
  note 
  upon 
  some 
  remains 
  of 
  an 
  

   immature 
  Hypsilophodon 
  Foxii 
  which 
  I 
  had 
  shortly 
  before 
  obtained 
  

   in 
  Brixton 
  Bay, 
  Isle 
  of 
  Wight, 
  from 
  the 
  west 
  end 
  of 
  the 
  well-known 
  

   bed 
  which 
  crops 
  out 
  at 
  the 
  top 
  of 
  the 
  cliff 
  at 
  Barnes 
  Chine 
  and 
  dips 
  

   under 
  the 
  beach 
  at 
  Cowleaze 
  Chine. 
  Their 
  chief 
  value 
  consisted 
  in 
  

   the 
  additional 
  light 
  they 
  threw 
  upon 
  its 
  dentition, 
  and 
  the 
  informa- 
  

   tion 
  they 
  afforded 
  of 
  the 
  form 
  and 
  the 
  proportions 
  of 
  the 
  limbs. 
  In 
  

   September 
  I 
  was 
  so 
  fortunate 
  as 
  to 
  obtain 
  in 
  the 
  same 
  locality 
  parts 
  

   of 
  two 
  individuals 
  (one 
  probably 
  fully 
  grown) 
  which, 
  as 
  they 
  illus- 
  

   trate 
  some 
  structures 
  better 
  than 
  any 
  other 
  remains 
  of 
  this 
  Dinosaur 
  

   yet 
  before 
  the 
  Society, 
  have 
  appeared 
  to 
  me 
  worthy 
  of 
  being 
  made 
  

   the 
  subject 
  of 
  a 
  supplementary 
  note. 
  

  

  The 
  bones 
  are 
  imbedded 
  in 
  a 
  block 
  of 
  sandy 
  clay-stone 
  which 
  had 
  

   fallen 
  from 
  the 
  cliff 
  and 
  had 
  been 
  washed 
  to 
  and 
  fro 
  by 
  the 
  sea 
  until 
  

   some 
  of 
  them 
  had 
  become 
  much 
  abraded. 
  The 
  most 
  important 
  are 
  

   a 
  skull 
  and 
  two 
  chains 
  of 
  vertebrae, 
  each 
  including 
  a 
  considerable 
  

   part 
  of 
  the 
  sacrum. 
  

  

  Skull. 
  — 
  This 
  is 
  larger 
  than 
  that 
  found 
  by 
  Mr. 
  Fox, 
  which 
  Prof. 
  

   Huxley 
  exhibited 
  here 
  in 
  November 
  1869. 
  Its 
  upper 
  surface 
  was 
  ex- 
  

   posed; 
  and 
  I 
  have 
  laid 
  bare 
  its 
  right 
  side 
  (PI. 
  III. 
  fig. 
  1). 
  The 
  maxillary 
  

   apparatus 
  is 
  broken 
  off 
  from' 
  the 
  cranium 
  proper, 
  and 
  twisted 
  round 
  so 
  

   that 
  the 
  dentigerous 
  border 
  of 
  the 
  maxillae 
  and 
  the 
  palate 
  now 
  look 
  

   upwards, 
  the 
  pterygoids 
  resting 
  in 
  the 
  lower 
  part 
  of 
  the 
  right 
  orbit. 
  

  

  The 
  upper 
  surface 
  of 
  the 
  skull 
  is 
  a 
  long 
  rhomboid 
  (I 
  refer 
  now 
  to 
  

   the 
  part 
  behind 
  the 
  front 
  of 
  the 
  orbits), 
  of 
  which 
  the 
  short 
  diameter 
  

   connects 
  the 
  stout 
  postorbital 
  processes; 
  and 
  the 
  sides 
  are 
  lines 
  

   drawn 
  from 
  these 
  to 
  the 
  front 
  of 
  the 
  supraorbital 
  arch 
  and 
  to 
  the 
  

   extremity 
  of 
  a 
  salient 
  occipital 
  (Pa.) 
  spine 
  in 
  wbich 
  the 
  parietal 
  region 
  

   terminates 
  behind 
  instead 
  of 
  presenting 
  here 
  the 
  entering 
  angle 
  

   usual 
  in 
  lizards' 
  skulls. 
  Large 
  pieces 
  of 
  the 
  parietal 
  and 
  of 
  the 
  

   frontal 
  bones 
  have 
  exfoliated, 
  laying 
  bare 
  the 
  matrix 
  moulded 
  to 
  

   the 
  inner 
  surface 
  of 
  the 
  vault. 
  Between 
  the 
  temples 
  this 
  pre- 
  

   sents 
  a 
  ridge 
  suggestive 
  of 
  a 
  parietal 
  crest 
  ; 
  and 
  between 
  the 
  

   orbits 
  is 
  a 
  mesial 
  furrow 
  indicative 
  of 
  the 
  division 
  of 
  the 
  principal 
  

   frontal 
  bone. 
  The 
  root 
  of 
  the 
  right- 
  parietal 
  suspensory 
  process 
  

   only 
  is 
  preserved 
  (#p.) 
  ; 
  its 
  direction 
  is 
  nearly 
  vertical 
  to 
  that 
  of 
  the 
  

   parietal 
  crest. 
  

  

  The 
  orbit 
  is 
  very 
  capacious 
  ; 
  # 
  4 
  inch 
  below 
  its 
  upper 
  border 
  lie 
  six 
  

   of 
  the 
  thin 
  bony 
  scales 
  of 
  the 
  sclerotic 
  coat 
  of 
  the 
  eyeball 
  ($.). 
  

  

  The 
  praemaxillae 
  (Prmx. 
  )want 
  the 
  edentulous 
  anterior 
  extremity 
  seen 
  

   in 
  Mr. 
  Fox's 
  specimen 
  ; 
  but 
  other 
  parts 
  of 
  their 
  structure 
  are 
  better 
  

   displayed 
  here, 
  owing 
  to 
  their 
  partial 
  separation 
  from 
  the 
  maxillae. 
  

  

  