﻿528 
  J. 
  W. 
  HULKE 
  ON 
  A 
  MODIFIED 
  FORM 
  OF 
  DUfOSATJRIAN 
  ILIUM. 
  

  

  point, 
  (singularly 
  enough, 
  on 
  the 
  day 
  my 
  letter 
  reached 
  him) 
  found 
  a 
  

   very 
  perfect 
  example 
  of 
  the 
  bone 
  ; 
  and 
  he 
  most 
  obligingly 
  carefully 
  

   removed 
  the 
  matrix 
  from 
  both 
  surfaces 
  to 
  look 
  for 
  a 
  sacral 
  impres- 
  

   sion, 
  but 
  did 
  not 
  find 
  any. 
  Its 
  absence 
  is, 
  I 
  think, 
  his 
  chief 
  reason 
  

   for 
  regarding 
  the 
  bone 
  as 
  a 
  scapula. 
  Should 
  the 
  absence 
  of 
  any 
  in- 
  

   dication 
  of 
  a 
  firm 
  cartilaginous 
  union 
  with 
  the 
  coalesced 
  sacral 
  

   transverse 
  processes 
  be 
  confirmed, 
  th.e 
  absence 
  will 
  not 
  disprove 
  the 
  

   iliac 
  nature 
  of 
  the 
  bone 
  ; 
  for 
  the 
  ilium 
  may 
  have 
  been 
  simply 
  at- 
  

   tached 
  by 
  strong 
  fibrous 
  bands 
  passing 
  Hgamentously 
  between 
  it 
  and 
  

   the 
  vertebral 
  column, 
  as 
  in 
  the 
  Enaliosauria. 
  Whichever 
  mode 
  of 
  

   attachment 
  obtained, 
  its 
  extent 
  was 
  manifestly 
  much 
  less 
  than 
  in 
  

   typical 
  Dinosaurians 
  ; 
  and 
  this 
  is 
  a 
  modification 
  of 
  sufficient 
  impor- 
  

   tance 
  to 
  place 
  the 
  possessors 
  of 
  such 
  ilia 
  outside 
  all 
  the 
  known 
  

   genera 
  of 
  Dinosauria, 
  and, 
  perhaps, 
  outside 
  this 
  order. 
  

  

  In 
  conclusion 
  I 
  would 
  tender 
  my 
  warm 
  thanks 
  to 
  Mr. 
  G. 
  B. 
  

   Holmes, 
  the 
  Rev. 
  W. 
  Fox, 
  and 
  Mr. 
  Beccles 
  for 
  kindly 
  affording 
  me 
  

   information 
  respecting 
  the 
  specimens 
  of 
  this 
  bone 
  in 
  their 
  col- 
  

   lections, 
  and 
  to 
  Dr. 
  Wilkins 
  especially, 
  for 
  the 
  interest 
  he 
  has 
  shown 
  

   and 
  the 
  aid 
  he 
  has 
  afforded 
  me 
  in 
  this 
  inquiry. 
  I 
  feel, 
  also, 
  that 
  

   an 
  apology 
  is 
  due 
  to 
  the 
  Society 
  for 
  trespassing 
  upon 
  its 
  time 
  whilst 
  

   some 
  difficulties 
  to 
  the 
  acceptance 
  of 
  the 
  interpretation 
  I 
  offer 
  re- 
  

   main 
  unsolved 
  ; 
  my 
  excuse 
  is 
  my 
  hope 
  that 
  some 
  of 
  our 
  Fellows 
  

   may, 
  during 
  the 
  recess, 
  recognize 
  specimens 
  of 
  these 
  ilia 
  which 
  may 
  

   be 
  lying 
  unknown 
  in 
  private 
  collections, 
  and 
  seize 
  the 
  opportunity 
  

   to 
  confirm 
  or 
  modify 
  my 
  conclusions. 
  

  

  EXPLANATION 
  OF 
  PLATE 
  XXXII. 
  

  

  Modified 
  Dinosaurian 
  Ilia 
  in 
  the 
  Collection 
  of 
  Br. 
  Wilkins, 
  Newport. 
  

  

  Figs. 
  1 
  & 
  2. 
  Smaller 
  specimen. 
  1 
  . 
  Outer 
  surface, 
  f 
  nat. 
  size 
  : 
  a. 
  articular 
  arc 
  ; 
  

   p. 
  pubic 
  process 
  ; 
  i. 
  ischial 
  process 
  ; 
  Spp. 
  suprapraspubic 
  process 
  ; 
  

   r. 
  ridge 
  directed 
  backwards 
  from 
  Spp, 
  concentric 
  with 
  a 
  ; 
  b. 
  body 
  ; 
  

   n. 
  notch. 
  2. 
  Direct 
  view 
  of 
  articular 
  arc, 
  J 
  nat. 
  size 
  (fig. 
  1, 
  a). 
  

   3 
  & 
  4. 
  Larger 
  specimen, 
  ? 
  nat. 
  size. 
  3. 
  The 
  outer 
  surface. 
  4. 
  The 
  inner 
  

   surface. 
  Letters 
  a, 
  p, 
  i, 
  Spp, 
  b, 
  n, 
  represent 
  the 
  same 
  parts 
  as 
  in 
  

   figs. 
  1 
  & 
  2. 
  

  

  