﻿J. 
  W. 
  HULKE 
  ON 
  A 
  MODIFIED 
  FORM 
  OF 
  DIN0SAURIA.N 
  ILIUM. 
  521 
  

  

  40. 
  Note 
  on 
  a 
  Modified 
  Form 
  of 
  Dinosaurian 
  Ilium, 
  hitherto 
  

  

  reputed 
  Scapula. 
  By 
  J. 
  W. 
  Hulke, 
  Esq., 
  F.E.S., 
  F.G.S. 
  (Read 
  

  

  June 
  10, 
  1874.) 
  

  

  [Plate 
  XXXII.] 
  

  

  The 
  subject 
  of 
  this 
  note 
  is 
  a 
  bone 
  the 
  true 
  place 
  of 
  which 
  in 
  the 
  

   skeleton, 
  I 
  suggest, 
  with 
  much 
  deference 
  to 
  the 
  opinions 
  of 
  the 
  emi- 
  

   nent 
  authorities 
  who 
  have 
  described 
  it, 
  has 
  been 
  misapprehended. 
  

   If 
  the 
  interpretation 
  I 
  suggest 
  should 
  prove 
  correct, 
  it 
  will 
  indicate 
  

   an 
  altogether 
  new 
  genus, 
  perhaps 
  even 
  a 
  new 
  order. 
  

  

  The 
  oldest 
  known 
  example 
  originally 
  formed 
  part 
  of 
  Dr. 
  Mantell's 
  

   collection. 
  Subsequently 
  it 
  was 
  purchased 
  by 
  the 
  British 
  Museum, 
  

   where, 
  labelled 
  " 
  Scapula 
  of 
  an 
  unknown 
  Reptile," 
  it 
  is 
  exhibited 
  

   amongst 
  the 
  Megalosaurian 
  remains. 
  Dr. 
  Mantell 
  originally 
  referred 
  

   it 
  to 
  his 
  then 
  newly 
  discovered 
  Iguanodon, 
  but 
  not 
  without 
  a 
  caution. 
  

   He 
  described 
  it 
  in 
  the 
  following 
  terms 
  : 
  — 
  

  

  " 
  A 
  scapula 
  or 
  omoplate 
  18 
  inches 
  long, 
  associated 
  with 
  bones 
  or 
  

   teeth 
  of 
  Iguanodon, 
  and 
  probably 
  referable 
  to 
  that 
  animal, 
  presents, 
  

   like 
  the 
  coracoid, 
  some 
  important 
  modifications 
  of 
  the 
  usual 
  lacer- 
  

   tian 
  type. 
  This 
  bone 
  is 
  of 
  an 
  elongated 
  form, 
  and 
  differs 
  consider- 
  

   ably 
  from 
  the 
  omoplate 
  of 
  the 
  Monitors 
  and 
  Iguanas. 
  It 
  somewhat 
  

   resembles 
  the 
  scapula 
  of 
  the 
  Scinlc, 
  and 
  it 
  throws 
  off 
  a 
  long 
  tripar- 
  

   tite 
  apophysis, 
  which 
  is 
  imperfect 
  in 
  the 
  only 
  specimen 
  hitherto 
  dis- 
  

   covered 
  ; 
  this 
  process 
  probably 
  afforded 
  support 
  to 
  a 
  cartilaginous 
  

   arch, 
  as 
  in 
  the 
  recent 
  lizards. 
  But 
  although, 
  from 
  circumstances, 
  

   I 
  entertain 
  but 
  Little 
  doubt 
  that 
  the 
  coracoid 
  and 
  omoplate 
  above 
  

   described 
  belong 
  to 
  the 
  Iguanodon, 
  it 
  is 
  so 
  hazardous 
  in 
  palseonto- 
  

   logical 
  inquiries 
  to 
  affirm 
  as 
  certain 
  what 
  is 
  merely 
  probable, 
  and 
  

   so 
  many 
  impediments 
  to 
  accurate 
  inductions 
  have 
  been 
  occasioned 
  

   by 
  hasty 
  and 
  positive 
  determination 
  of 
  a 
  tooth 
  or 
  bone 
  from 
  imperfect 
  

   analogies, 
  that 
  I 
  deem 
  it 
  necessary 
  to 
  repeat 
  that 
  these 
  specimens 
  

   were 
  not 
  found 
  in 
  juxtaposition 
  with 
  other 
  parts 
  of 
  the 
  skeleton 
  

   of 
  the 
  Iguanodon, 
  but 
  were 
  merely 
  imbedded 
  in 
  the 
  same 
  mass 
  of 
  

   rock." 
  (Phil. 
  Trans. 
  1841, 
  p. 
  138.) 
  

  

  This 
  opinion 
  was 
  adopted 
  by 
  Prof. 
  Owen 
  : 
  — 
  

  

  "The 
  scapula," 
  he 
  wrote 
  (in 
  1841), 
  "has 
  not 
  hitherto 
  been 
  dis- 
  

   covered 
  so 
  associated 
  with 
  other 
  unequivocal 
  portions 
  of 
  the 
  skeleton 
  

   of 
  the 
  Iguanodon 
  as 
  to 
  permit 
  the 
  characteristics 
  of 
  this 
  bone 
  to 
  be 
  

   confidently 
  recognized. 
  The 
  bone 
  (No. 
  194, 
  omoplate 
  of 
  Iguanodon, 
  

   Mantellian 
  Catalogue) 
  agrees 
  with 
  the 
  undoubted 
  scapula 
  of 
  the 
  

   Hykeosaur 
  and 
  with 
  that 
  of 
  certain 
  lacertians, 
  especially 
  of 
  the 
  

   genus 
  Scincus 
  (Dr. 
  Mantell 
  has 
  pointed 
  out 
  this 
  resemblance 
  in 
  his 
  

   Memoir 
  in 
  the 
  ' 
  Phil. 
  Trans.' 
  1841), 
  in 
  the 
  production 
  of 
  a 
  long 
  

   and 
  slender 
  pointed 
  process 
  continued 
  nearly 
  at 
  right 
  angles 
  with 
  

   the 
  body 
  of 
  the 
  bone 
  from 
  the 
  anterior 
  part 
  of 
  the 
  articular 
  surface 
  

   for 
  the 
  coracoid 
  ; 
  but 
  it 
  differs 
  from 
  the 
  scapula 
  of 
  the 
  Hykeosaiir 
  

   in 
  the 
  presence 
  of 
  two 
  short 
  processes 
  given 
  off 
  from 
  the 
  lower 
  part 
  

   of 
  the 
  base 
  of 
  this 
  long 
  process, 
  and 
  in 
  the 
  absence 
  of 
  the 
  thick 
  and 
  

  

  Q. 
  J. 
  G. 
  S. 
  No. 
  120. 
  2 
  o 
  

  

  