﻿88 
  ACTE5T0PTERYGII. 
  

  

  1871. 
  Pycnodusrudis, 
  J. 
  Phillips, 
  ibid. 
  p. 
  180, 
  woodc. 
  xl. 
  fig. 
  1. 
  [Mandi- 
  

   „ 
  bular 
  ramus 
  ; 
  Oxford 
  Museum.] 
  

  

  1890. 
  Lepidotus 
  unguiculatus, 
  A. 
  S. 
  Woodward, 
  Proc. 
  Geol. 
  Assoc. 
  

  

  vol. 
  xi. 
  p. 
  292, 
  pi. 
  iii. 
  figs. 
  7, 
  8. 
  

   1892, 
  Lepidotus 
  unguiculatus, 
  A. 
  S. 
  Woodward, 
  ibid. 
  vol. 
  xii. 
  p. 
  239. 
  

  

  Type. 
  Left 
  suboperculum 
  ; 
  Oxford 
  Museum. 
  

  

  This 
  specific 
  name 
  was 
  originally 
  applied 
  to 
  a 
  large, 
  coarsely- 
  

   tuberculated 
  suboperculum 
  from 
  the 
  Stonesfield 
  Slate, 
  erroneously 
  

   regarded 
  by 
  Agassiz 
  as 
  a 
  scale. 
  No 
  second 
  example 
  has 
  been 
  dis- 
  

   covered, 
  and 
  the 
  only 
  known 
  remains 
  of 
  Lepidotus 
  of 
  the 
  same 
  age 
  

   are 
  fragmentary. 
  It 
  is 
  thus 
  impossible, 
  as 
  yet, 
  to 
  define 
  L. 
  tuber- 
  

   culatus 
  scientifically 
  ; 
  and 
  we 
  merely 
  adopt 
  the 
  name 
  provisionally 
  

   for 
  all 
  the 
  scattered 
  remains 
  of 
  Lepidotus 
  discovered 
  in 
  the 
  English 
  

   Bathonian 
  formation. 
  Such 
  remains 
  have 
  hitherto 
  been 
  described 
  

   as 
  L. 
  unguiculatus, 
  Ag. 
  ; 
  but 
  since 
  the 
  type 
  specimen 
  of 
  the 
  latter 
  

   species 
  was 
  obtained 
  from 
  the 
  Kimmeridgian 
  of 
  Bavaria, 
  it 
  is 
  ex- 
  

   tremely 
  improbable 
  that 
  the 
  Bathonian 
  fossils 
  pertain 
  to 
  the 
  same 
  

   fish, 
  while 
  it 
  may 
  be 
  regarded 
  as 
  certain 
  that 
  at 
  least 
  a 
  large 
  

   proportion 
  of 
  these 
  specimens 
  will 
  eventually 
  prove 
  to 
  have 
  been 
  

   correctly 
  referred 
  to 
  the 
  position 
  where 
  they 
  are 
  now 
  placed. 
  

  

  A 
  premaxilla 
  in 
  the 
  Northampton 
  Museum 
  exhibits 
  four 
  robust 
  

   styliform 
  teeth 
  ; 
  and 
  all 
  the 
  teeth 
  on 
  the 
  inner 
  elements 
  hitherto 
  

   discovered 
  in 
  the 
  Bathonian 
  are 
  rounded 
  and 
  stout, 
  though 
  fixed 
  

   on 
  comparatively 
  long 
  pedicles. 
  The 
  teeth 
  of 
  the 
  dentary 
  bone, 
  

   known 
  in 
  two 
  specimens 
  from 
  the 
  neighbourhood 
  of 
  Oxford 
  and 
  in 
  

   one 
  from 
  Orton, 
  near 
  Peterborough, 
  are 
  not 
  acuminate, 
  but 
  smaller 
  

   than 
  the 
  splenial 
  teeth 
  and 
  with 
  more 
  slender 
  pedicles 
  ; 
  the 
  splenial 
  

   teeth 
  do 
  not 
  appear 
  to 
  form 
  more 
  than 
  three 
  irregular 
  concentric 
  

   series, 
  and 
  the 
  crown 
  in 
  some 
  is 
  oval. 
  The 
  principal 
  flank-scales 
  

   exhibit 
  two, 
  three, 
  or 
  more 
  large 
  slender 
  denticulations 
  in 
  the 
  lower 
  

   half 
  of 
  the 
  hinder 
  margin. 
  

  

  Form. 
  Sf 
  Log. 
  Bathonian: 
  Oxfordshire, 
  Gloucestershire, 
  Somerset- 
  

   shire, 
  Wiltshire, 
  and 
  Northamptonshire. 
  

  

  P. 
  1111 
  a. 
  Small 
  right 
  squamosal, 
  showing 
  rugosity 
  and 
  course 
  of 
  

   slime-canal 
  ; 
  Stonesfield 
  Slate, 
  Stonesfield, 
  near 
  Oxford. 
  

  

  Egerton 
  Coll. 
  

  

  47141. 
  Imperfect 
  mandibular 
  ramus, 
  with 
  dentary 
  and 
  some 
  splenial 
  

   teeth 
  ; 
  Great 
  Oolite, 
  Orton, 
  near 
  Peterborough. 
  

  

  Sharp 
  Coll. 
  

  

  P. 
  7411. 
  Fragment, 
  apparently 
  of 
  upper 
  dentition; 
  Forest 
  Marble, 
  

   Stanton, 
  Wiltshire. 
  Cunnington 
  Coll. 
  

  

  