﻿CHELOJSTIA 
  AND 
  A 
  TOOTH 
  OF 
  (?) 
  ORKCTHOPSIS. 
  245 
  

  

  Swindon, 
  described 
  by 
  Sir 
  E. 
  Owen 
  as 
  Bothriospondylus 
  suffosus, 
  to 
  

   the 
  Theropoda 
  ; 
  but 
  they 
  are 
  undoubtedly 
  those 
  of 
  a 
  young 
  Sauro- 
  

   podous 
  Dinosaur, 
  and 
  from 
  their 
  general 
  resemblance 
  to 
  the 
  vertebrae 
  

   of 
  the 
  Wealden 
  Ornithopsis 
  may 
  be 
  referable 
  to 
  0. 
  humerocristatus. 
  

  

  On 
  the 
  other 
  hand 
  there 
  is 
  a 
  possibility 
  that 
  the 
  teeth 
  in 
  question 
  

   may 
  be 
  allied 
  to 
  the 
  Kimeridgian 
  form 
  represented 
  by 
  the 
  vertebra 
  

   iu 
  the 
  Cambridge 
  Museum, 
  to 
  which 
  Prof. 
  Seeley 
  has 
  applied 
  the 
  name 
  

   of 
  Oigantosaurus, 
  and 
  which 
  is 
  apparently 
  different 
  from 
  the 
  vertebrae 
  

   of 
  Ornithopsis. 
  I 
  may 
  observe, 
  however, 
  that 
  I 
  have 
  great 
  hesitation 
  

   in 
  deciding 
  whether 
  that 
  name 
  ought 
  to 
  be 
  adopted 
  ; 
  firstly, 
  because 
  

   the 
  type 
  has 
  never 
  been 
  figured 
  ; 
  and 
  secondly, 
  because 
  the 
  name 
  

   G. 
  megalonyx 
  is 
  clearly 
  applicable 
  to 
  the 
  ungual 
  phalangeal 
  which 
  

   is 
  mentioned 
  with 
  the 
  vertebra, 
  but 
  which 
  may 
  equally 
  well, 
  as 
  I 
  

   have 
  indicated, 
  in 
  pt. 
  i. 
  of 
  the 
  British 
  Museum 
  ' 
  Catalogue 
  of 
  Fossil 
  

   Reptilia 
  and 
  Amphibia,' 
  belong 
  to 
  Ornithopsis 
  humerocristatus. 
  

  

  Passing 
  to 
  an 
  older 
  deposit, 
  two 
  teeth 
  of 
  smaller 
  size, 
  but 
  of 
  pre- 
  

   cisely 
  the 
  same 
  general 
  type, 
  from 
  the 
  Forest 
  Marble 
  of 
  Wiltshire 
  

   have 
  been 
  figured 
  by 
  Sir 
  B,. 
  Owen 
  * 
  under 
  the 
  name 
  of 
  Cardiodon 
  

   rugulosus. 
  Since, 
  according 
  to 
  Prof. 
  Prestwich, 
  the 
  remains 
  of 
  Cetio- 
  

   saurus 
  oxoniensis 
  in 
  the 
  Oxford 
  Museum 
  were 
  mainly 
  obtained 
  from 
  

   the 
  Porest 
  Marble, 
  and 
  not 
  from 
  the 
  Great 
  Oolite, 
  it 
  is 
  highly 
  pro- 
  

   bable 
  that 
  the 
  tooth 
  in 
  question 
  is 
  referable 
  to 
  that 
  species. 
  I 
  

   am 
  unable 
  to 
  determine 
  the 
  exact 
  date 
  of 
  publication 
  of 
  the 
  name 
  

   Cardiodon 
  ; 
  but 
  the 
  specific 
  name 
  rugulosus 
  is 
  much 
  earlier 
  than 
  

   Phillips's 
  oxoniensis, 
  and 
  ought 
  to 
  replace 
  the 
  latter 
  if 
  the 
  two 
  forms 
  

   be 
  identical. 
  

  

  [Addendttm. 
  — 
  Since 
  the 
  above 
  was 
  written, 
  Mr. 
  C. 
  D. 
  Sherborn, 
  

   F.G.S., 
  has 
  given 
  me 
  a 
  reference 
  to 
  the 
  dates 
  of 
  publication 
  of 
  Owen's 
  

   1 
  Odontography.' 
  It 
  thus 
  appears 
  that 
  part 
  i., 
  containing 
  plates 
  i., 
  

   ii., 
  and 
  1-48, 
  was 
  published 
  in 
  1840; 
  pt. 
  ii., 
  with 
  plates 
  49-87 
  in 
  

   1841 
  ; 
  and 
  pt. 
  iii., 
  with 
  plates 
  87 
  «-150, 
  in 
  1845. 
  The 
  name 
  Car- 
  

   diodon 
  is 
  therefore 
  of 
  earlier 
  date 
  than 
  Cetiosaurus, 
  which 
  appeared 
  

   in 
  the 
  ' 
  Eep. 
  Brit. 
  Assoc' 
  for 
  1841, 
  published 
  in 
  1842. 
  I 
  may 
  also 
  

   add 
  that 
  the 
  tooth 
  mentioned 
  above 
  as 
  being 
  figured 
  under 
  the 
  

   name 
  of 
  Ornithopsis 
  had, 
  in 
  1852, 
  been 
  made 
  the 
  type 
  of 
  Hoplo- 
  

   saurus 
  armatus, 
  Gervais, 
  a 
  name 
  of 
  earlier 
  date 
  than 
  Ornithopsis. 
  — 
  

   March, 
  1889.] 
  

  

  EXPLANATION 
  OF 
  PLATE 
  VIII. 
  

  

  Crania 
  of 
  Bhinochelys, 
  from 
  the 
  Cambridge 
  Greensand. 
  

  

  Figs. 
  1, 
  la. 
  B. 
  pulchriceps. 
  Figs. 
  5, 
  5 
  a. 
  B. 
  

  

  2, 
  2 
  a, 
  2 
  b. 
  B. 
  cantabrigiensis. 
  6, 
  6 
  a, 
  6 
  b. 
  B. 
  

  

  3, 
  3 
  a. 
  B. 
  brachyrhina. 
  7. 
  B. 
  macrorhina. 
  

  

  4. 
  B. 
  

  

  All 
  the 
  figures 
  are 
  of 
  the 
  natural 
  size. 
  The 
  originals 
  of 
  figs. 
  1, 
  2, 
  5 
  are 
  in 
  

   the 
  British 
  Museum, 
  the 
  others 
  in 
  the 
  collection 
  of 
  T. 
  Jesson, 
  Esq. 
  

  

  pmx, 
  premaxilla 
  ; 
  mx, 
  maxilla 
  ; 
  n, 
  nasal 
  ; 
  pr.f, 
  prefrontal 
  ; 
  fr, 
  frontal 
  ; 
  

   jpt.f, 
  postfrontal 
  ; 
  pa, 
  parietal 
  ; 
  sq, 
  squamosal 
  ; 
  q. 
  /, 
  quadratojugal 
  ; 
  /, 
  jugal. 
  

  

  * 
  Odontography, 
  p. 
  291, 
  pi. 
  lxxv.A. 
  fig. 
  7 
  (1840-45). 
  

  

  