﻿144 
  J. 
  W. 
  HTJLKE 
  ON 
  SOME 
  IGTTANODON-KEMAINS. 
  

  

  had 
  a 
  scuted 
  hide 
  ; 
  but 
  until 
  the 
  acquisition 
  of 
  these 
  remains 
  such 
  

   evidence 
  was 
  very 
  fragmentary. 
  In 
  cutting 
  away 
  the 
  rock 
  from 
  

   the 
  larger 
  bones 
  of 
  the 
  hind 
  limb, 
  I 
  found 
  beneath 
  it 
  a 
  layer 
  of 
  

   bony 
  tissue 
  separated 
  from 
  the 
  endoskeleton 
  by 
  a 
  deeper 
  layer 
  of 
  

   rock 
  enclosing 
  much 
  black 
  carbonaceous 
  matter. 
  From 
  its 
  position 
  

   with 
  reference 
  to 
  the 
  endoskeleton 
  it 
  was 
  obvious 
  that 
  the 
  outer 
  

   layer 
  of 
  bony 
  tissue 
  was 
  exoskeletal 
  — 
  was 
  in 
  short 
  a 
  dermal 
  mail. 
  

   In 
  order 
  to 
  lay 
  bare 
  the 
  tibia, 
  it 
  was 
  necessary 
  to 
  cut 
  away 
  a 
  greave 
  of 
  

   such 
  dermal 
  covering. 
  The 
  scutes 
  composing 
  it 
  are 
  distinctly 
  bony, 
  

   of 
  irregular 
  polygonal 
  form 
  ; 
  some 
  are 
  2 
  centim. 
  (|- 
  in.) 
  thick, 
  and 
  7 
  

   centim. 
  (2| 
  in.) 
  in 
  diameter. 
  Their 
  external 
  surface 
  is 
  slightly 
  pitted. 
  

   For 
  the 
  Iguanodon 
  indicated 
  by 
  these 
  remains, 
  the 
  distinctness 
  of 
  

   which 
  from 
  those 
  of 
  /. 
  Mantelli 
  * 
  is 
  beyond 
  doubt, 
  I 
  propose 
  the 
  

   specific 
  name 
  Seelyi 
  (Iguanodon 
  Seelyi), 
  in 
  slight 
  acknowledg- 
  

   ment 
  of 
  the 
  great 
  courtesy 
  of 
  Charles 
  Seely, 
  Esq., 
  of 
  Brook 
  House, 
  

   in 
  permitting 
  me 
  to 
  excavate 
  the 
  cliff 
  for 
  their 
  recovery. 
  

  

  EXPANATION 
  OF 
  PLATE 
  IV. 
  

  

  Fig. 
  1. 
  The 
  left 
  ilium, 
  outer 
  view 
  : 
  p, 
  the 
  pubic 
  process 
  ; 
  i, 
  the 
  ischial 
  process 
  ; 
  

   pa, 
  the 
  prseaeetabular 
  process. 
  X 
  1- 
  

  

  2. 
  The 
  right 
  femur, 
  dorsal 
  or 
  anterior 
  view 
  : 
  ic, 
  the 
  deep 
  anterior 
  inter- 
  

  

  condylar 
  groove 
  ; 
  i 
  t, 
  the 
  inner 
  trochanter. 
  X 
  i. 
  

  

  3. 
  The 
  right 
  tibia, 
  anterior 
  view, 
  x 
  h 
  

  

  4. 
  The 
  fibula, 
  outer 
  view. 
  X 
  i- 
  

  

  5. 
  The 
  left 
  foot 
  : 
  m, 
  metatarsus 
  ; 
  ii, 
  the 
  inner 
  ; 
  iii, 
  the 
  middle 
  ; 
  iv, 
  the 
  

  

  outer 
  toe. 
  X 
  %. 
  

  

  6. 
  The 
  right 
  humerus, 
  dorsal 
  view 
  : 
  p 
  a. 
  proximal 
  articular 
  surface 
  ; 
  pp, 
  

  

  the 
  posterior 
  process 
  ; 
  r, 
  the 
  radial 
  crest. 
  X 
  |. 
  

  

  Discussion. 
  

  

  Prof. 
  Seeley 
  spoke 
  of 
  the 
  important 
  work 
  carried 
  on 
  by 
  the 
  

   author, 
  whereby 
  genera 
  founded 
  on 
  imperfect 
  evidence 
  had 
  been 
  got 
  

   rid 
  of. 
  He 
  doubted 
  whether 
  a 
  form 
  with 
  an 
  ilium 
  so 
  different 
  from 
  

   that 
  of 
  Iguanodon 
  Mantelli 
  ought 
  to 
  be 
  referred 
  to 
  the 
  ame 
  genus. 
  

   The 
  same 
  doubts 
  were 
  suggested 
  by 
  the 
  different 
  proportions 
  of 
  the 
  

   limb 
  -bones, 
  and 
  by 
  peculiarities 
  of 
  the 
  vertebrae, 
  as 
  compared 
  with 
  

   those 
  of 
  Iguanodon. 
  

  

  Dr. 
  Mueie 
  thought 
  that 
  the 
  foot 
  might 
  have 
  been 
  slightly 
  webbed, 
  

   and 
  remarked 
  that 
  the 
  hind 
  limb 
  was 
  remarkably 
  bird-like, 
  as 
  shown 
  

   by 
  the 
  diagram 
  ; 
  but 
  he 
  doubted 
  whether 
  the 
  natural 
  position 
  of 
  the 
  

   limb-bones 
  was 
  that 
  represented 
  by 
  the 
  author 
  in 
  his 
  restoration. 
  

   He 
  thought 
  that 
  the 
  bones 
  called 
  by 
  the 
  author 
  chevron 
  bones 
  in 
  

   the 
  foot 
  might 
  be 
  sesamoid 
  bones. 
  He 
  believed 
  with 
  the 
  author 
  

   that 
  the 
  tail 
  was 
  mailed. 
  

  

  Mr. 
  Httlke 
  said 
  that 
  he 
  could 
  not 
  entertain 
  the 
  idea 
  that 
  the 
  

   chevron 
  bones 
  on 
  the 
  foot 
  could 
  be 
  regarded 
  as 
  sesamoid 
  bones. 
  

   True 
  sesamoid 
  bones 
  were, 
  indeed, 
  present 
  ; 
  but 
  portions 
  of 
  chevron 
  

   bones 
  had 
  been 
  accidentally 
  fossilized 
  in 
  connexion 
  with 
  the 
  foot. 
  

   None 
  of 
  the 
  footprints 
  showed 
  any 
  trace 
  of 
  a 
  web. 
  He 
  agreed 
  with 
  

   Prof. 
  Seeley 
  as 
  to 
  the 
  great 
  size 
  of 
  the 
  tail. 
  With 
  the 
  present 
  

   evidence 
  he 
  thought 
  it 
  safer 
  to 
  refer 
  the 
  form 
  to 
  Iguanodon 
  than 
  to 
  

   create 
  a 
  new 
  genus. 
  

  

  * 
  The 
  Iguanodon 
  indicated 
  by 
  the 
  remains 
  in 
  the 
  well-known 
  slab 
  figured 
  in 
  

   the 
  Foss. 
  Eept. 
  of 
  the 
  Cretaceous 
  formations, 
  pis. 
  xxiii. 
  xxiv., 
  is 
  taken 
  as 
  the 
  type 
  

   of 
  I. 
  Mantelli. 
  

  

  