﻿48 
  MR. 
  E. 
  LYDEKKER 
  ON 
  THE 
  REMAINS 
  AND 
  AFFINITIES 
  

  

  species 
  to 
  that 
  genus 
  under 
  the 
  respective 
  names 
  of 
  0. 
  Prestwichi 
  

   and 
  O. 
  Leedsi, 
  and 
  thus 
  relegate 
  Cumnoria 
  to 
  the 
  rank 
  of 
  a 
  

   synonym, 
  till 
  it 
  can 
  be 
  shown 
  to 
  have 
  well-marked 
  distinctive 
  

   features. 
  

  

  So 
  far 
  nothing 
  has 
  been 
  said 
  as 
  to 
  how 
  the 
  present 
  specimen 
  can 
  

   be 
  distinguished 
  generically 
  from 
  the 
  femur 
  of 
  Hypsilophodon 
  ; 
  

   I 
  find, 
  however, 
  that 
  its 
  inner 
  trochanter 
  is 
  rather 
  more 
  wing-like 
  

   in 
  shape 
  than 
  in 
  that 
  genus. 
  In 
  a 
  recent 
  number 
  of 
  the 
  ' 
  Geolo- 
  

   gical 
  Magazine 
  ' 
  * 
  I 
  have 
  called 
  attention 
  to 
  an 
  imperfect 
  femur 
  in 
  

   the 
  British 
  Museum 
  (No. 
  E. 
  167) 
  f 
  from 
  the 
  Wealden 
  of 
  the 
  Isle 
  of 
  

   Wight, 
  which 
  has 
  been 
  referred 
  to 
  Hypsilophodon, 
  and 
  have 
  suggested 
  

   that, 
  together 
  with 
  a 
  mandibular 
  ramus 
  (No. 
  K-. 
  180) 
  J 
  from 
  the 
  

   Wealden, 
  hitherto 
  regarded 
  as 
  that 
  of 
  a 
  young 
  Iguanodon, 
  it 
  pro- 
  

   bably 
  indicates 
  a 
  form 
  allied 
  to 
  Camptosaurus. 
  A 
  comparison 
  of 
  

   this 
  femur 
  with 
  the 
  subject 
  of 
  the 
  present 
  communication 
  shows 
  

   such 
  a 
  close 
  similarity 
  between 
  the 
  two 
  that 
  there 
  is 
  every 
  proba- 
  

   bility 
  of 
  their 
  generic 
  identity 
  ; 
  and 
  since 
  there 
  is 
  no 
  other 
  evidence 
  

   of 
  the 
  existence 
  of 
  a 
  Hypsilophodon 
  of 
  these 
  dimensions, 
  I 
  propose 
  

   to 
  apply 
  the 
  name 
  Camptosaurus 
  valdensis 
  to 
  the 
  Wealden 
  form, 
  of 
  

   which 
  I 
  take 
  the 
  femur 
  as 
  the 
  type, 
  and 
  provisionally 
  associate 
  with 
  

   it 
  the 
  mandibular 
  ramus. 
  

  

  I 
  may 
  add 
  that 
  the 
  ilium 
  of 
  the 
  type 
  species 
  of 
  Camptosaurus 
  is 
  

   remarkable 
  for 
  the 
  extreme 
  shortness 
  of 
  its 
  preacetabular 
  process. 
  

   We 
  have 
  no 
  evidence 
  of 
  the 
  contour 
  of 
  this 
  portion 
  in 
  C. 
  Prestwichi 
  ; 
  

   but 
  even 
  if 
  there 
  should 
  be 
  a 
  difference 
  in 
  this 
  respect 
  I 
  should 
  not 
  

   be 
  disposed 
  to 
  regard 
  it 
  as 
  of 
  more 
  than 
  specific 
  value. 
  Finally, 
  I 
  

   see 
  no 
  reason 
  to 
  remove 
  Iguanodon 
  Dawsoni, 
  of 
  which 
  I 
  published 
  

   the 
  description 
  in 
  the 
  above-mentioned 
  paper, 
  from 
  the 
  type 
  genus. 
  

  

  IY. 
  On 
  tite 
  Skeleton 
  of 
  a 
  Satjroptertgian 
  from 
  the 
  

   Oxford 
  Clay 
  near 
  Bedford. 
  

  

  On 
  page 
  139 
  of 
  his 
  'Index 
  to 
  the 
  Fossil 
  Eemains 
  of 
  Aves, 
  Ornitho- 
  

   sauria, 
  and 
  Reptilia 
  in 
  the 
  Woodwardian 
  Museum 
  at 
  Cambridge,' 
  

   published 
  in 
  1869, 
  Professor 
  Seeley 
  applied 
  the 
  name 
  Plesiosaurus 
  

   philarchus 
  to 
  the 
  greater 
  part 
  of 
  the 
  skeleton 
  of 
  a 
  Sauropterygian 
  

   from 
  the 
  Oxford 
  Clay 
  of 
  Peterborough, 
  which 
  was 
  collected 
  by 
  Dr. 
  

   H. 
  Porter, 
  and 
  is 
  preserved 
  in 
  that 
  Museum. 
  The 
  type 
  specimen 
  

   comprises 
  part 
  of 
  the 
  cranial 
  rostrum, 
  the 
  nearly 
  entire 
  mandible, 
  

   with 
  the 
  teeth 
  broken 
  off, 
  the 
  vertebral 
  column, 
  and 
  the 
  pectoral 
  and 
  

   pelvic 
  limbs, 
  with 
  portions 
  of 
  their 
  respective 
  girdles. 
  

  

  Unfortunately, 
  none 
  of 
  these 
  remains 
  have 
  ever 
  been 
  figured, 
  and 
  

   it 
  appears 
  to 
  me 
  somewhat 
  doubtful 
  whether 
  the 
  description 
  is 
  

   sufficient 
  for 
  the 
  definition 
  of 
  a 
  species. 
  Since, 
  however, 
  by 
  in- 
  

   spection 
  of 
  the 
  specimen 
  itself, 
  I 
  have 
  been 
  enabled 
  to 
  satisfy 
  myself 
  

   of 
  its 
  specific 
  identity 
  with 
  the 
  subject 
  of 
  the 
  present 
  notice, 
  I 
  

   shall 
  adopt 
  the 
  specific 
  name 
  without 
  further 
  parley. 
  

  

  * 
  Decade 
  iii. 
  vol. 
  v. 
  p. 
  453 
  (1888). 
  

  

  t 
  Cat. 
  Foss. 
  Kept. 
  Brit. 
  Mus. 
  pt. 
  i. 
  p. 
  195 
  (1888). 
  

  

  X 
  Ibid. 
  p. 
  227. 
  

  

  