﻿J. 
  W. 
  HTTLKE 
  ON 
  SOME 
  IGTTANODON-REMATNS. 
  143 
  

  

  first 
  three 
  caudal 
  vertebrae 
  are 
  dwarfed 
  ; 
  and 
  they 
  disappear 
  at 
  about 
  

   the 
  tenth 
  centrum 
  reckoned 
  from 
  the 
  sacrum. 
  The 
  length 
  of 
  their 
  

   transverse 
  processes 
  leads 
  me 
  therefore 
  to 
  place 
  the 
  three 
  vertebras 
  

   between 
  the 
  fourth 
  and 
  ninth 
  in 
  the 
  postsacral 
  chain. 
  Their 
  strong 
  

   resemblance 
  to 
  the 
  vertebras 
  referred 
  by 
  Dr. 
  G. 
  A. 
  Mantell 
  and 
  

   Prof. 
  It. 
  Owen 
  to 
  Pelorosaurus 
  is 
  very 
  suggestive 
  of 
  the 
  identity 
  of 
  

   this 
  with 
  my 
  Brook 
  Iguanodon. 
  

  

  Humerus 
  (PI. 
  IY. 
  fig. 
  6). 
  — 
  With 
  the 
  exception 
  of 
  the 
  distal 
  end, 
  

   which 
  has 
  been 
  crushed 
  off, 
  this 
  bone 
  is 
  excellently 
  preserved. 
  Its 
  

   present 
  length 
  is 
  67 
  centim. 
  (26-| 
  in.) 
  ; 
  10 
  centim. 
  would 
  not 
  be 
  an 
  

   excessive 
  allowance 
  for 
  the 
  missing 
  part, 
  which 
  would 
  make 
  the 
  

   original 
  length 
  77 
  centim. 
  (30 
  in.) 
  ; 
  but 
  it 
  should 
  be 
  understood 
  that 
  

   this 
  is 
  only 
  an 
  approximation. 
  

  

  The 
  proximal 
  half 
  of 
  the 
  bone 
  is 
  compressed. 
  The 
  ventral 
  surface 
  

   of 
  this 
  part 
  is 
  hollow 
  transversely 
  ; 
  and 
  the 
  dorsal 
  surface 
  is 
  convex 
  

   in 
  the 
  same 
  direction. 
  The 
  proximal 
  end 
  is 
  convex 
  ; 
  the 
  articular 
  

   surface 
  (pa) 
  is 
  at 
  the 
  summit 
  of 
  the 
  curve. 
  Prom 
  it 
  is 
  produced 
  

   upon 
  the 
  dorsal 
  surface 
  of 
  the 
  bone, 
  to 
  a 
  distance 
  of 
  15 
  centim. 
  

   (5^ 
  in.), 
  a 
  stout, 
  rough 
  ridge, 
  bounded 
  on 
  each 
  side 
  by 
  a 
  wide 
  

   shallow 
  groove. 
  The 
  posterior 
  border 
  of 
  the 
  bone 
  is 
  concave 
  ; 
  and 
  at 
  

   its 
  junction 
  with 
  the 
  proximal 
  end 
  is 
  an 
  angular 
  backward 
  pro- 
  

   jecting 
  process 
  (pp), 
  as 
  in 
  the 
  humerus 
  of 
  /. 
  Prestwichii. 
  

  

  A 
  strong 
  rough 
  crest 
  gives 
  a 
  convex 
  contour 
  to 
  the 
  anterior 
  or 
  

   radial 
  border 
  of 
  the 
  bone. 
  This 
  crest, 
  which 
  begins 
  at 
  the 
  proximal 
  

   end, 
  subsides 
  at 
  the 
  distance 
  of 
  38 
  centim. 
  (15 
  in.) 
  from 
  it. 
  The 
  

   broad 
  hollow 
  noticed 
  in 
  the 
  ventral 
  surface 
  of 
  the 
  proximal 
  end 
  is 
  

   continued 
  down 
  the 
  shaft 
  in 
  the 
  form 
  of 
  a 
  wide 
  shallow 
  groove, 
  

   which 
  only 
  disappears 
  where 
  the 
  shaft 
  begins 
  to 
  expand 
  near 
  the 
  

   distal 
  condyles. 
  The 
  dorsal 
  aspect 
  of 
  the 
  shaft 
  is 
  convex 
  transversely. 
  

   This 
  configuration 
  of 
  the 
  dorsal 
  and 
  ventral 
  surfaces 
  gives 
  to 
  a 
  cross 
  

   section 
  of 
  the 
  shaft 
  an 
  oval 
  shape, 
  in 
  which 
  the 
  curve 
  answering 
  

   to 
  the 
  ventral 
  surface 
  is 
  indented 
  at 
  its 
  middle. 
  The 
  chord 
  of 
  the 
  

   proximal 
  end 
  is 
  26*5 
  centim. 
  (10-J 
  in.). 
  The 
  breadth 
  of 
  the 
  bone 
  at 
  

   the 
  most 
  salient 
  part 
  of 
  the 
  radial 
  crest 
  is 
  21-5 
  centim. 
  (8 
  j 
  in.) 
  ; 
  and 
  

   the 
  girth 
  of 
  the 
  shaft 
  is 
  40 
  centim. 
  (15| 
  in.). 
  

  

  It 
  will 
  be 
  seen 
  that 
  the 
  form 
  of 
  the 
  proximal 
  end 
  of 
  this 
  humerus 
  

   agrees 
  with 
  that 
  of 
  i". 
  Prestiuichii 
  *, 
  and 
  differs 
  greatly 
  from 
  the 
  

   representations 
  of 
  a 
  humerus 
  in 
  the 
  collection 
  of 
  J. 
  B. 
  Holmes, 
  Esq., 
  

   of 
  Horsham, 
  given 
  by 
  Prof. 
  It. 
  Owen 
  in 
  his 
  ' 
  Possil 
  Reptilia 
  of 
  the 
  

   Wealden 
  Formations,' 
  pi. 
  xiv. 
  figs. 
  3, 
  4. 
  These 
  figures 
  I 
  never 
  

   understood 
  until, 
  some 
  time 
  since, 
  by 
  the 
  courtesy 
  of 
  Mr. 
  Holmes, 
  

   I 
  had 
  an 
  opportunity 
  of 
  examining 
  the 
  specimen. 
  Its 
  proximal 
  end 
  

   is, 
  in 
  great 
  part, 
  a 
  restoration 
  in 
  Roman 
  cement, 
  and 
  " 
  pi. 
  xiv. 
  figs. 
  4, 
  5. 
  

   Monograph 
  Iguanodon 
  " 
  are, 
  I 
  was 
  informed 
  by 
  Mr. 
  Holmes, 
  copies 
  

   of 
  drawings 
  by 
  Miss 
  Holmes. 
  To 
  the 
  great 
  artistic 
  talent 
  of 
  this 
  

   lady, 
  her 
  very 
  beautifully 
  executed 
  and 
  truthful 
  drawings 
  of 
  fossil 
  

   bones 
  which 
  I 
  have 
  seen 
  bear 
  testimony. 
  I 
  shall, 
  however, 
  not 
  do 
  

   her 
  any 
  injustice 
  if 
  I 
  suggest 
  the 
  absence 
  of 
  such 
  critical 
  anatomical 
  

   knowledge 
  as 
  would 
  have 
  enabled 
  her 
  to 
  distinguish 
  the 
  real 
  from 
  

   the 
  fictile 
  parts 
  of 
  the 
  bone. 
  

  

  Dermal 
  Covering. 
  — 
  I 
  had 
  long 
  possessed 
  evidence 
  that 
  Iguanodon 
  

   * 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxxvi. 
  p. 
  454. 
  

  

  