﻿208 
  ACTINOPTERYGII. 
  

  

  P. 
  3749. 
  Vomerine 
  dentition 
  with 
  comparatively 
  narrow 
  median 
  

   teeth 
  ; 
  Coral 
  Rag, 
  Lindnerberg, 
  Hanover. 
  

  

  Enniskillen 
  Coll. 
  

  

  P. 
  5950. 
  Vomer, 
  partly 
  fractured, 
  showing 
  some 
  of 
  the 
  unworn 
  

   rugose 
  teeth 
  ; 
  Coral 
  Rag, 
  Holzen, 
  Eschershausen. 
  

  

  Purchased, 
  18S9. 
  

  

  P. 
  7438. 
  Fragments 
  of 
  two 
  large 
  vomers 
  ; 
  Kimmeridgian, 
  Lan- 
  

  

  genberg. 
  Purchased, 
  1895. 
  

  

  P. 
  5951. 
  Right 
  splenial 
  ; 
  Holzen. 
  Purchased, 
  1889. 
  

  

  P. 
  7436. 
  Associated 
  splenials 
  ; 
  Langenberg. 
  Purchased, 
  1895. 
  

  

  Me 
  so 
  don 
  granulatus 
  (Munster). 
  

  

  1846. 
  Pycnodus 
  granulatus, 
  G. 
  von 
  Munster, 
  Beitr. 
  Petrefakt. 
  pt. 
  vii. 
  

  

  p. 
  44, 
  pi. 
  iii. 
  figs. 
  11, 
  12. 
  

   1846. 
  Pycnodus 
  ju 
  yleri, 
  G. 
  von 
  Munster, 
  ibid. 
  p. 
  42, 
  pi. 
  iii. 
  figs. 
  8-10. 
  

  

  [Fragments 
  of 
  dentition 
  ; 
  Palaeontological 
  Museum, 
  Munich.] 
  

   (?) 
  1846. 
  Pycnodus 
  nicoleti, 
  G. 
  von 
  Munster 
  {errore), 
  ibid. 
  p. 
  42. 
  

   1858. 
  Pyknodus 
  granulatus, 
  F. 
  A. 
  Quenstedt, 
  Der 
  Jura, 
  p. 
  782, 
  pi. 
  xcvi. 
  

  

  fig. 
  20. 
  

   1875. 
  Mesodon 
  granulatus, 
  K. 
  Fricke, 
  Palaeontogr. 
  vol. 
  xxii. 
  p. 
  859, 
  

  

  pi. 
  xviii 
  , 
  pi. 
  xix. 
  figs. 
  1-5. 
  

   (?) 
  1880. 
  Mesodon 
  granulatus, 
  H. 
  E. 
  Sauvage, 
  Bull. 
  Soc. 
  Geol. 
  France, 
  

  

  [3] 
  vol. 
  viii. 
  p. 
  528, 
  pi. 
  xix. 
  fig. 
  3. 
  

  

  Type. 
  Detached 
  teeth 
  ; 
  Natural 
  History 
  Museum, 
  Berlin. 
  

  

  A 
  large 
  species, 
  imperfectly 
  known. 
  External 
  bones 
  and 
  scales 
  

   ornamented 
  with 
  very 
  coarse 
  granulations. 
  Teeth 
  feebly 
  rugose, 
  

   those 
  of 
  the 
  lateral 
  series 
  with 
  an 
  apical 
  pit, 
  and 
  soon 
  becoming 
  

   smooth 
  by 
  abrasion 
  ; 
  outline 
  of 
  teeth 
  often 
  irregularly 
  rounded. 
  

   Vomerine 
  teeth 
  sparsely 
  arranged, 
  those 
  of 
  the 
  median 
  series 
  con- 
  

   siderably 
  broader 
  than 
  long, 
  and 
  their 
  breadth 
  equalling 
  or 
  slightly 
  

   exceeding 
  that 
  of 
  the 
  two 
  lateral 
  series. 
  Splenial 
  teeth 
  more 
  

   closely 
  arranged, 
  those 
  of 
  the 
  principal 
  series 
  often 
  twice 
  as 
  broad 
  

   as 
  long, 
  flanked 
  within 
  by 
  one 
  row 
  of 
  small 
  round 
  teeth 
  and 
  ex- 
  

   ternally 
  by 
  three 
  series, 
  of 
  which 
  the 
  median 
  is 
  the 
  smallest 
  (some- 
  

   times 
  partly 
  duplicated) 
  and 
  the 
  outer 
  about 
  equal 
  in 
  size 
  to 
  the 
  

   inner 
  series. 
  

  

  This 
  definition 
  is 
  based 
  upon 
  the 
  researches 
  of 
  Fricke. 
  

  

  Form. 
  Sf 
  Loc. 
  Corallian 
  and 
  Kimmeridgian 
  : 
  Hanover, 
  Wiirtem- 
  

   berg, 
  S. 
  England, 
  and 
  (?) 
  X. 
  France. 
  

  

  P. 
  1655. 
  Portion 
  of 
  left 
  splenial 
  dentition 
  ; 
  Corallian, 
  Lindner- 
  

   berg, 
  Hanover. 
  Egerton 
  Coll. 
  

  

  