﻿530 
  Mr. 
  R. 
  W. 
  Tlooley 
  on. 
  the 
  

  

  <>euus 
  Ormthocheb'us 
  "no 
  teeth 
  anterior 
  to 
  palate^'; 
  but, 
  

   becoming 
  " 
  convinced 
  " 
  that 
  the 
  type 
  of 
  Pterodactylus 
  sinivs 
  

   was 
  a 
  lower 
  jaw, 
  Seeley 
  abandoned 
  the 
  genus 
  Ptenodactylus, 
  

   and 
  included 
  all 
  the 
  specimens 
  under 
  Ornithocheirus 
  , 
  being 
  

   tbus 
  compelled 
  to 
  add 
  the 
  character 
  " 
  the 
  teeth 
  are 
  pro- 
  

   longed 
  anterior 
  to 
  the 
  muzzle/' 
  nullifying 
  the 
  original 
  cha- 
  

   racter 
  of 
  the 
  genus. 
  

  

  Further 
  characters 
  appear 
  to 
  have 
  been 
  added 
  after 
  the 
  

   discovery 
  of 
  the 
  toothless 
  forms 
  of 
  America, 
  when 
  "it 
  

   became 
  evident 
  that 
  the 
  bones 
  of 
  the 
  skeleton 
  are 
  mostly 
  

   formed 
  on 
  the 
  same 
  plan 
  as 
  those 
  of 
  the 
  Cambridge 
  genus 
  

   Ornithocheirus. 
  " 
  The 
  foundation 
  for 
  this 
  seems 
  to 
  be 
  that 
  

   portions 
  of 
  an 
  edentulous 
  jaw 
  had 
  been 
  found 
  in 
  the 
  Cam- 
  

   In'idge 
  Greensand. 
  These 
  were 
  determined 
  by 
  Owen'^ 
  to 
  be 
  

   the 
  " 
  proximal 
  end 
  of 
  metacarpal 
  of 
  wing," 
  and 
  recognized 
  

   later 
  by 
  Seeley 
  t 
  ^s 
  parts 
  of 
  the 
  premaxilloe. 
  In 
  1891 
  % 
  he 
  

   refers 
  to 
  his 
  provisional 
  name 
  of 
  OrnitJiostoma 
  for 
  these 
  

   three 
  portions 
  of 
  edentulous 
  jaws, 
  details 
  the 
  resemblances 
  

   to 
  Ftera)iodon, 
  and 
  finds 
  the 
  only 
  difference 
  is 
  " 
  the 
  American 
  

   toothless 
  Oruithosaur 
  is 
  twice 
  the 
  size." 
  Then 
  follows 
  the 
  

   inclusion 
  of 
  characters 
  belonging 
  to 
  Ptemnodon 
  into 
  both 
  

   Ornithoclieirus 
  and 
  Orniihostuma. 
  The 
  odd 
  fragmentary 
  

   bones 
  show 
  the 
  same 
  characters 
  as 
  the 
  American 
  forms, 
  and 
  

   these 
  are 
  made 
  common 
  l)oth 
  to 
  the 
  toothed 
  and 
  toothless. 
  

   In 
  regard 
  to 
  the 
  beak, 
  the 
  following 
  description 
  reveals 
  the 
  

   confused 
  state 
  of 
  things 
  § 
  : 
  — 
  " 
  The 
  beak 
  varies 
  greatly 
  in 
  

   length 
  and 
  in 
  form, 
  though 
  it 
  is 
  never 
  quite 
  so 
  pointed 
  as 
  in 
  

   the 
  American 
  genus, 
  for 
  there 
  is 
  always 
  a 
  little 
  truncation 
  in 
  

   front, 
  when 
  teeth 
  are 
  seen 
  projecting 
  forward 
  from 
  a 
  position 
  

   somewhat 
  above 
  the 
  palate 
  ; 
  tiie 
  suout 
  is 
  often 
  massive 
  and 
  

   sometimes 
  club-shaped.''^ 
  In 
  regard 
  to 
  the 
  toothless 
  jaw 
  

   {Ornithostoma), 
  it 
  not 
  only 
  diverges 
  from 
  the 
  original 
  and 
  

   the 
  amended 
  characters 
  laid 
  down 
  for 
  Ornithocheirus 
  in 
  the 
  

   absence 
  of 
  teeth, 
  but 
  also 
  "in 
  the 
  smooth 
  palate 
  formed 
  by 
  

   a 
  single 
  wide 
  concave 
  channel," 
  which 
  is 
  widely 
  at 
  variance 
  

   Avith 
  the 
  well-developed 
  longitudinal 
  ridge 
  of 
  the 
  palate 
  in 
  

   the 
  latter. 
  Seeley 
  saw 
  evidence 
  of 
  the 
  crest 
  on 
  specimen 
  

   no. 
  J. 
  c. 
  8, 
  2, 
  a 
  fragment 
  of 
  the 
  back 
  of 
  the 
  skull 
  which 
  he 
  

   described 
  and 
  figured 
  [| 
  in 
  1870. 
  Twenty-one 
  years 
  later 
  he 
  

   still 
  held 
  to 
  this, 
  but 
  was 
  apparently 
  shaken 
  in 
  his 
  deter- 
  

  

  * 
  R. 
  Owen, 
  Hep. 
  Cret. 
  Form. 
  (Mon. 
  Pal. 
  Soc. 
  1859), 
  Suppl. 
  i. 
  

   t 
  II. 
  G. 
  Seelev, 
  Anu. 
  & 
  Mag. 
  Nat. 
  Hist. 
  (4) 
  vol. 
  vii. 
  p. 
  35, 
  

   [871). 
  

  

  p. 
  18. 
  

  

  footnote 
  

   (1871). 
  

  

  X 
  Id. 
  ibid. 
  (0) 
  vol. 
  vii. 
  p. 
  441 
  (1891). 
  

   § 
  Id. 
  ' 
  Prairons 
  of 
  the 
  Air," 
  1901, 
  p. 
  177, 
  

   II 
  Id. 
  ' 
  Oruitliosauria/ 
  1870, 
  pi. 
  xi. 
  tig. 
  1. 
  

  

  