﻿OF 
  FIVE 
  GENERA 
  OE 
  MESOZOIC 
  REPTILES. 
  

  

  47 
  

  

  evidence 
  to 
  prove 
  that 
  the 
  present 
  specimen 
  indicates 
  a 
  form 
  speci- 
  

   fically 
  distinct 
  from 
  the 
  species 
  from 
  the 
  Kimeridge 
  Clay 
  ; 
  but 
  since 
  

   most 
  of 
  the 
  Sauropterygians 
  of 
  the 
  Kimeridge 
  are 
  distinct 
  from 
  

   those 
  of 
  the 
  Oxford 
  Clay, 
  I 
  think 
  it 
  highly 
  probable 
  that 
  the 
  same 
  

   may 
  hold 
  good 
  with 
  the 
  Dinosaurs, 
  and 
  I 
  therefore 
  propose 
  to 
  

   provisionally 
  regard 
  the 
  present 
  specimen 
  as 
  the 
  representative 
  of 
  

   a 
  distinct 
  species 
  which 
  may 
  have 
  been 
  somewhat 
  smaller 
  than 
  

   Iguanodon 
  PrestiuicJiii. 
  

  

  With 
  regard 
  to 
  the 
  generic 
  name, 
  I 
  may 
  observe 
  that, 
  in 
  a 
  paper 
  

   communicated 
  last 
  year 
  to 
  the 
  Society's 
  ' 
  Journal/ 
  it 
  was 
  stated 
  that 
  I 
  

  

  Rff. 
  3. 
  

  

  Inner 
  aspect 
  of 
  the 
  left 
  femur 
  of 
  Camptosaurus 
  Leedsi; 
  from 
  the 
  Oxford 
  Clay 
  

   near 
  Peterborough. 
  -J 
  nat. 
  size, 
  a, 
  head 
  ; 
  b, 
  lesser 
  trochanter; 
  c, 
  inner 
  

   trochanter 
  ; 
  d, 
  intercondylar 
  groove 
  ; 
  e, 
  inner 
  condyle. 
  

  

  was 
  not 
  then 
  satisfied 
  as 
  to 
  the 
  necessity 
  of 
  separating 
  /. 
  Prestwicldi 
  

   from 
  Iguanodon. 
  The 
  features 
  shown 
  by 
  the 
  present 
  femur 
  (assum- 
  

   ing 
  that 
  I 
  am 
  right 
  in 
  regarding 
  it 
  as 
  indicating 
  a 
  form 
  allied 
  to 
  

   that 
  species) 
  totally 
  alter 
  the 
  case 
  ; 
  and 
  since 
  I 
  can 
  see 
  no 
  characters 
  

   by 
  which 
  either 
  this 
  specimen 
  or 
  I. 
  PrestiuicJiii 
  can 
  be 
  separated 
  from 
  

   Camptosaurus, 
  I 
  propose 
  to 
  refer 
  both 
  the 
  Kimeridgian 
  and 
  Oxfordian 
  

  

  