﻿204 
  ' 
  ACTINOPTERYGII. 
  

  

  series 
  of 
  small 
  teeth 
  occurring 
  on 
  each 
  side. 
  Splenial 
  teeth 
  closely 
  

   arranged, 
  those 
  of 
  the 
  principal 
  series 
  considerably 
  broader 
  than 
  

   long, 
  flanked 
  within 
  by 
  one 
  irregular 
  row 
  of 
  small 
  round 
  teeth 
  and 
  

   externally 
  by 
  three 
  series, 
  of 
  which 
  the 
  outermost 
  scarcely 
  exceeds 
  

   the 
  innermost 
  in 
  size. 
  

  

  Form. 
  Sf 
  Loc. 
  Bathonian 
  : 
  Northamptonshire, 
  Oxfordshire, 
  and 
  

   Gloucestershire 
  ; 
  Normandy 
  \ 
  

  

  38554. 
  Imperfect 
  large 
  vomer 
  ; 
  locality 
  unknown. 
  

  

  Purchased, 
  1864. 
  

  

  42274. 
  Smaller 
  vomerine 
  dentition, 
  less 
  abraded 
  ; 
  locality 
  unknown. 
  

  

  Baugh 
  Coll. 
  

  

  35498. 
  Vomerine 
  dentition 
  0*02 
  in 
  length 
  ; 
  Stonesfield 
  Slate, 
  Stones- 
  

   field. 
  Purchased, 
  1860. 
  

  

  P. 
  1648-a. 
  Similar 
  specimen 
  and 
  one 
  smaller 
  ; 
  Stonesfield. 
  

  

  Egerton 
  Coll. 
  

  

  32550. 
  Plaster 
  cast 
  of 
  imperfect 
  vomerine 
  dentition 
  ; 
  Great 
  Oolite, 
  

   Caen, 
  Normandy. 
  Tesson 
  Coll. 
  

  

  P. 
  3779. 
  Small 
  vomerine 
  dentition 
  described 
  and 
  figured 
  by 
  Agassiz, 
  

   loc. 
  cit., 
  as 
  the 
  type 
  specimen 
  of 
  Gyrodus 
  trigonus 
  ; 
  Stones- 
  

   field. 
  Ennishillen 
  Coll. 
  

  

  P. 
  521. 
  Smaller 
  specimen 
  noticed 
  by 
  Agassiz, 
  loc. 
  cit., 
  and 
  figured 
  

   in 
  Proc. 
  Geol. 
  Assoc, 
  vol. 
  xi. 
  (1890), 
  pi. 
  iii. 
  fig. 
  2Q 
  ; 
  

   Stonesfield. 
  Egerton 
  Coll. 
  

  

  P. 
  4387. 
  Right 
  splenial 
  dentition, 
  much 
  broken 
  ; 
  Stonesfield. 
  

  

  Enniskillen 
  Coll. 
  

  

  1370 
  (Sloane 
  Catalogue). 
  Smaller 
  specimen, 
  right 
  side 
  ; 
  "Witney, 
  

   Oxfordshire. 
  Sloane 
  Coll. 
  

  

  P. 
  1666 
  C. 
  Smaller 
  right 
  splenial 
  ; 
  Stonesfield. 
  Egerton 
  Coll. 
  

  

  P. 
  522. 
  Small 
  right 
  splenial 
  dentition, 
  labelled 
  " 
  Pycnodus 
  parvus, 
  

   Ag.," 
  in 
  Agassiz' 
  handwriting, 
  described 
  and 
  figured 
  in 
  

   Proc. 
  Geol. 
  Assoc, 
  vol. 
  xi. 
  (1890), 
  p. 
  299, 
  pi. 
  iii. 
  fig. 
  23; 
  

   Stonesfield. 
  Egerton 
  Coll. 
  

  

  P. 
  3780-81. 
  Slightly 
  larger 
  examples 
  of 
  the 
  right 
  and 
  left 
  splenial 
  

   dentition, 
  the 
  first 
  labelled 
  " 
  Pycnodus 
  latirostris, 
  Agass.," 
  

  

  1 
  A 
  very 
  similar 
  though 
  not 
  identical 
  dentition 
  is 
  also 
  known 
  from 
  the 
  

   Kimmeridgian 
  of 
  Hanover 
  (K. 
  Fricke, 
  Palseontogr. 
  vol. 
  xxii. 
  1875, 
  p. 
  362, 
  pi. 
  xix. 
  

   figs. 
  6, 
  7). 
  

  

  