﻿PLATE 
  XVII. 
  

  

  Fig. 
  Page 
  

  

  1. 
  Mesodon 
  sp. 
  ; 
  vomerine 
  dentition. 
  — 
  Great 
  Oolite; 
  Caen. 
  

  

  [40353.] 
  212 
  

  

  2. 
  Athrodon 
  sp. 
  ; 
  vomerine 
  dentition. 
  — 
  Portland 
  Stone 
  ; 
  near 
  

  

  Weymouth. 
  [P. 
  7186.] 
  217 
  

  

  ... 
  

  

  3. 
  Microdon 
  hugii 
  (Agassiz) 
  ; 
  left 
  splenial 
  dentition. 
  — 
  Ibid. 
  

  

  [30871.] 
  229 
  

  

  4. 
  Gyrodus 
  planidens, 
  sp. 
  nov. 
  ; 
  vomerine 
  dentition. 
  — 
  Kim- 
  

  

  meridge 
  Clay 
  ; 
  Weymouth. 
  [P. 
  3785 
  b.] 
  244 
  

  

  5. 
  Vomerine 
  dentition 
  of 
  undetermined 
  Pycnodont. 
  — 
  Ibid. 
  

  

  [43285.] 
  245 
  

  

  6. 
  Aspidorhynchus 
  euodas, 
  Egerton 
  ; 
  skull, 
  lateral 
  aspect. 
  — 
  

  

  Oxford 
  Clay 
  ; 
  Christian 
  Malford. 
  ecpt. 
  Ectopterygoid. 
  

   enpt. 
  Entopterygoid. 
  na. 
  Narial 
  opening, 
  pas. 
  Para- 
  

   sphenoid, 
  pi. 
  Palatine, 
  pmco. 
  Premaxilla. 
  pt. 
  Post- 
  

   temporal, 
  qu. 
  Quadrate. 
  [40518.] 
  423 
  

  

  7. 
  Ditto 
  ; 
  imperfect 
  fractured 
  skull, 
  the 
  hinder 
  portion 
  ex- 
  

  

  posed 
  from 
  above, 
  the 
  rostrum 
  from 
  below. 
  — 
  Ibid, 
  fr, 
  

   Frontal, 
  pa. 
  Parietal, 
  pas. 
  Parasphenoid. 
  pf. 
  Pre- 
  

   frontal, 
  pmx. 
  Premaxilla. 
  sq. 
  Squamosal, 
  v. 
  Vomer. 
  

  

  8. 
  Ditto 
  ; 
  Maxilla.— 
  Ibid. 
  

  

  9. 
  Ditto 
  ; 
  right 
  Dentary. 
  — 
  Ibid. 
  

  

  10. 
  Ditto; 
  Splenial. 
  

  

  11. 
  Aspidorhynchus 
  crassus, 
  A. 
  S. 
  "Woodward 
  

  

  bone. 
  — 
  Stonesfleld 
  Slate 
  ; 
  Stonesfield. 
  

  

  12. 
  Belonostomus 
  tenuirostris, 
  Agassiz 
  ; 
  head, 
  lateral 
  aspect. 
  — 
  

  

  Lower 
  Kimmeridgian 
  ; 
  Solenhofen. 
  d. 
  Dentary. 
  ps. 
  

   Presymphysial 
  bone. 
  [35014.] 
  432 
  

  

  [29042.] 
  

  

  424 
  

  

  [29045 
  a.] 
  

  

  425 
  

  

  [41298.] 
  

  

  425 
  

  

  [29047.] 
  

  

  425 
  

  

  presymphysial 
  

  

  

  [P. 
  3720 
  g.] 
  

  

  427 
  

  

  