﻿540 
  Mr. 
  R. 
  W. 
  Ilooley 
  on 
  the 
  

  

  Dorsal 
  Vertebra. 
  

  

  Seeley 
  * 
  classifies 
  these 
  vertebrae 
  into 
  two 
  groups 
  by 
  tlie 
  

   same 
  characteristics. 
  He 
  gives 
  as 
  examples 
  those 
  figured 
  l)y 
  

   Owen 
  t 
  ill 
  bis 
  memoir 
  on 
  Pierodactt/lus 
  sedyivicki. 
  There 
  is 
  

   no 
  justification 
  for 
  Owen 
  assigning 
  either 
  the 
  cervical 
  to 
  

   P. 
  simus 
  or 
  the 
  dorsal 
  to 
  P. 
  sedgnncid, 
  nor 
  for 
  Seeley 
  tiie 
  

   flat 
  cervicals 
  to 
  Ornithocheirus. 
  The 
  characters 
  pertaining 
  

   to 
  any 
  particular 
  genus 
  cannot 
  yet 
  be 
  definitely 
  given. 
  

  

  The 
  Notarium. 
  

  

  Bones 
  which 
  in 
  Ornithosauria 
  were 
  included 
  in 
  the 
  sacrum 
  

   and 
  the 
  os 
  innominatum, 
  and 
  numbered 
  and 
  figured 
  respec- 
  

   tively 
  

  

  J. 
  c. 
  4, 
  1. 
  Ornithosauria. 
  PI. 
  x. 
  Figs. 
  8, 
  9. 
  

   J. 
  b. 
  10, 
  3. 
  do. 
  PI. 
  viii. 
  Pig. 
  3. 
  

  

  by 
  the 
  discovery 
  of 
  the 
  blending 
  of 
  the 
  early 
  dorsal 
  vertebi 
  ffi 
  

   into 
  the 
  so-called 
  notarium 
  of 
  the 
  American 
  form 
  Pteranodon, 
  

   were 
  found 
  to 
  belong 
  to 
  this 
  portion 
  of 
  the 
  axial 
  skeleton. 
  

   Owen 
  J 
  described 
  and 
  figured 
  a 
  bone 
  from 
  the 
  Cambridge 
  

   Greensand 
  which 
  belongs 
  to 
  the 
  notarium 
  as 
  " 
  probably 
  

   frontal.^^ 
  The 
  specimen 
  J. 
  c. 
  4, 
  1 
  was 
  figured 
  in 
  the 
  restora- 
  

   tion 
  of 
  the 
  pectoral 
  girdle 
  by 
  Seeley 
  in 
  1891 
  § 
  and 
  1901 
  ||. 
  

   Both 
  of 
  these 
  differ 
  in 
  detail 
  from 
  the 
  original 
  vertebra 
  which 
  

   is 
  figured 
  in 
  Ornithosauria. 
  Prof. 
  Williston 
  ^ 
  has 
  pointel 
  

   out 
  that 
  the 
  vertebra 
  of 
  these 
  figures 
  is 
  "undoubtedly 
  

   wrong.'' 
  

  

  It 
  would, 
  porhaps, 
  be 
  safe 
  to 
  assign 
  to 
  Ornithosloma 
  all 
  

   the 
  specimens 
  belonging 
  to 
  the 
  notarium^ 
  because 
  we 
  have 
  

   the 
  American 
  evidence 
  of 
  its 
  obtaining 
  in 
  Ornithostuma 
  

   {Pteranodon), 
  while 
  there 
  is 
  none 
  as 
  regards 
  the 
  denti^erous 
  

   jaws 
  from 
  Cambridge. 
  

  

  Ttie 
  Sacrum. 
  

  

  The 
  six 
  specimens 
  of 
  sacral 
  vertebrae 
  are 
  so 
  destroyed 
  that 
  

   it 
  is 
  impossible 
  to 
  say 
  whether 
  the 
  transverse 
  ribs 
  were 
  

   anchyloscd 
  at 
  their 
  distal 
  extremities 
  as 
  in 
  Ornithostoma 
  

   [Pteranodon). 
  Nos. 
  1 
  and 
  2 
  have 
  the 
  ventral 
  surface 
  of 
  the 
  

  

  * 
  H. 
  G. 
  Seeley, 
  ' 
  Ornitliosauria,' 
  1870, 
  p. 
  09. 
  

  

  t 
  R. 
  Owen, 
  Rep. 
  Cret. 
  Form. 
  (Mon. 
  Pal. 
  Soc. 
  ]859), 
  Sup])l. 
  i. 
  pi. 
  ii. 
  

   figs. 
  20 
  & 
  '23, 
  and 
  tigs. 
  24 
  & 
  25. 
  

   t 
  Id. 
  ibid. 
  p. 
  12, 
  pi. 
  iv. 
  tigs. 
  6-8. 
  

  

  § 
  H. 
  G. 
  Seeley, 
  Ann. 
  & 
  Mag. 
  Nat. 
  Ilist. 
  (6) 
  vol. 
  vii. 
  p. 
  441, 
  fig. 
  2 
  (1831). 
  

   II 
  Id. 
  ' 
  Dragons 
  of 
  the 
  Air,' 
  1901, 
  p. 
  115. 
  

   il 
  S. 
  W. 
  Williston. 
  Kansas 
  Univ. 
  Quart. 
  1897, 
  p. 
  44. 
  

  

  