﻿Ormihosaurian 
  Genus 
  Oi'nitlioclieirus. 
  557 
  

  

  apportioned 
  to 
  any 
  particular 
  genus, 
  except 
  those 
  which, 
  by 
  

   comparison 
  with 
  the 
  American 
  forms, 
  belong 
  to 
  Ornitho- 
  

   stoma. 
  

  

  The 
  other 
  groups 
  must 
  remain 
  isolated 
  until 
  some 
  further 
  

   discovery 
  determines 
  their 
  relationship. 
  

  

  Classification. 
  

  

  Family 
  Ornithocheiridse. 
  

  

  Subfamily 
  Ornitrocreirin^. 
  

  

  Genera 
  Ornithochbirus 
  (Seeley). 
  

  

  LONCHODECTES. 
  

  

  Subfamily 
  Criorrtncrinm. 
  

  

  Genera 
  Criorhynchus 
  (Owen). 
  

   Amblydectes. 
  

  

  Family 
  Ornithostomatidse. 
  

  

  Genus 
  Ornithostoma 
  (Seeley). 
  

   (Pteranodon, 
  Marsh.) 
  

  

  In 
  conclusion, 
  I 
  would 
  like 
  to 
  bear 
  witness 
  to 
  the 
  magnifi- 
  

   cent 
  work 
  of 
  Seeley 
  in 
  the 
  determination 
  and 
  interpretation 
  

   of 
  such 
  fiTigraentary 
  material. 
  It 
  must 
  have 
  been 
  a 
  most 
  

   difficult 
  task. 
  1 
  also 
  desire 
  to 
  thank 
  Professor 
  T. 
  McKeuny 
  

   Hughes 
  for 
  his 
  courtesy 
  and 
  kindness 
  in 
  lending 
  me 
  the 
  

   type-specimens 
  for 
  study. 
  

  

  EXPLANATION 
  OF 
  PLATE 
  XXIL 
  

  

  Fif/. 
  1. 
  Left 
  lateral 
  view 
  of 
  Cambridge 
  specimen 
  J. 
  c. 
  9. 
  O., 
  orbit; 
  

  

  Sn.OC.CR., 
  supra-occipital 
  crest; 
  OC, 
  occiput. 
  X 
  about 
  4. 
  

   Fig 
  2. 
  Occiput 
  of 
  same 
  specimen 
  above 
  the 
  foramen 
  magiuuii. 
  f.m., 
  

  

  foramen 
  magnum 
  ; 
  p.t.f., 
  post-temporal 
  fossa?. 
  X 
  about 
  5. 
  

   Fig 
  3. 
  Posterior 
  view 
  of 
  skull 
  of 
  same 
  specimen. 
  <S'?<. 
  OCCii., 
  section 
  of 
  

  

  supra-occipital 
  crest 
  ; 
  OC, 
  occiput, 
  x 
  about 
  |. 
  

   Fig. 
  4. 
  Left 
  lateral 
  view 
  of 
  the 
  tip 
  of 
  the 
  upper 
  jaw 
  of 
  Criorhynchus 
  

  

  simns 
  (after 
  Owen). 
  Nat. 
  size. 
  

   Fig. 
  5. 
  Leit 
  lateral 
  view 
  of 
  a 
  portion 
  of 
  the 
  upper 
  jaw 
  of 
  Colohorhynchiis 
  

  

  clanirostris 
  (after 
  Owen). 
  The 
  dotted 
  lines 
  indicate 
  the 
  amount 
  

  

  of 
  the 
  upper 
  jaw 
  worn 
  away 
  by 
  attrition. 
  Nat. 
  size. 
  

  

  