﻿ASPIDORHYNCHID^;. 
  427 
  

  

  the 
  cranium 
  ; 
  cranial 
  bones 
  ornamented 
  with 
  prominent 
  rugae 
  and 
  

   granulations, 
  mandible 
  almost 
  smooth 
  ; 
  principal 
  mandibular 
  teeth 
  

   broad, 
  of 
  moderate 
  size, 
  and 
  well 
  spaced 
  ; 
  presymphysial 
  bone 
  about 
  

   three 
  times 
  as 
  long 
  as 
  its 
  maximum 
  depth. 
  

   Form. 
  <$f 
  Log. 
  Bathonian 
  ; 
  Oxfordshire. 
  

  

  39199, 
  39200. 
  The 
  type 
  specimens, 
  two 
  skulls 
  described 
  and 
  

   figured 
  in 
  Proc. 
  Geol. 
  Assoc, 
  vol. 
  xi. 
  p. 
  295, 
  pi. 
  iii. 
  figs. 
  

   11, 
  12 
  ; 
  Stonesfield 
  Slate, 
  Stonesfield, 
  near 
  Oxford. 
  

  

  Bowerbank 
  Coll. 
  

  

  P. 
  959. 
  Two 
  portions 
  of 
  cranial 
  roof; 
  Stonesfield. 
  Egerton 
  Coll. 
  

  

  P. 
  3720 
  a. 
  Eight 
  maxilla, 
  figured 
  he. 
  cit. 
  pi. 
  iii. 
  fig. 
  13 
  ; 
  Stonesfield. 
  

  

  Enniskillen 
  Coll. 
  

  

  P. 
  877 
  b. 
  Fragment 
  probably 
  of 
  a 
  maxilla 
  of 
  this 
  species 
  ; 
  Stones- 
  

   field. 
  Egerton 
  Coll. 
  

  

  P. 
  3720 
  b. 
  Left 
  dentary 
  bone, 
  figured 
  loc. 
  cit. 
  pi. 
  iii. 
  fig. 
  14 
  ; 
  

   Stonesfield. 
  Enniskillen 
  Coll. 
  

  

  41294. 
  Left 
  dentary 
  ; 
  Stonesfield. 
  Purchased, 
  1869. 
  

  

  P. 
  877 
  a, 
  C, 
  d. 
  Three 
  imperfect 
  dentaries 
  ; 
  Stonesfield. 
  

  

  Egerton 
  Coll. 
  

   P. 
  3720 
  C, 
  d, 
  e. 
  Three 
  imperfect 
  dentaries 
  ; 
  Stonesfield. 
  

  

  Enniskillen 
  Coll. 
  

  

  P. 
  3720 
  g. 
  Presymphysial 
  bone 
  with 
  teeth, 
  shown 
  of 
  the 
  natural 
  

   size 
  in 
  PI. 
  XVII. 
  fig. 
  11. 
  Enniskillen 
  Coll. 
  

  

  P. 
  3720 
  f. 
  Imperfect 
  left 
  pterygoid 
  arcade 
  ; 
  Stonesfield. 
  

  

  Enniskillen 
  Coll. 
  

  

  The 
  following 
  specimen 
  is 
  too 
  imperfect 
  for 
  specific 
  determina- 
  

   tion 
  : 
  — 
  

  

  P. 
  2058. 
  Much-disturbed 
  remains 
  of 
  a 
  fish 
  measuring 
  about 
  0*36 
  

   from 
  the 
  pectoral 
  arch 
  to 
  the 
  base 
  of 
  the 
  caudal 
  fin 
  ; 
  

   Lithographic 
  Stone, 
  Cirin, 
  Am, 
  France. 
  The 
  trunk 
  

   appears 
  to 
  be 
  stouter 
  than 
  in 
  A. 
  acutirostris 
  from 
  Bavaria, 
  

   and 
  all 
  the 
  scales 
  exhibited 
  are 
  smooth. 
  Bing-vertebra3 
  

   are 
  displayed, 
  and 
  the 
  ribs 
  shown 
  in 
  the 
  abdominal 
  region 
  

   are 
  both 
  short 
  and 
  delicate. 
  Of 
  the 
  anal 
  fin 
  16 
  supports 
  

   are 
  preserved, 
  while 
  there 
  is 
  only 
  evidence 
  of 
  12 
  rays 
  in 
  

   the 
  dorsal. 
  Egerton 
  Coll. 
  

  

  Aspidorhynchus 
  silesianus 
  is 
  an 
  undefined 
  name 
  given 
  by 
  Hohe- 
  

   negger 
  to 
  some 
  fragments 
  from 
  the 
  Aptian 
  of 
  Wernsdorf, 
  Moravia, 
  

  

  