﻿EUGNATHIDJ']. 
  359 
  

  

  fins 
  unknown]. 
  Scales 
  thick, 
  with 
  a 
  narrow 
  overlapped 
  border 
  not 
  

   produced 
  at 
  the 
  angles, 
  and 
  the 
  peg-and-socket 
  articulation 
  feeble 
  

   or 
  wanting 
  ; 
  superficial 
  ganoine 
  more 
  or 
  less 
  striated 
  or 
  pitted 
  ; 
  

   numerous 
  series 
  of 
  narrow 
  ventral 
  scales. 
  

  

  One 
  group 
  of 
  remains 
  mentioned 
  below, 
  and 
  another 
  similarly 
  

   fragmentary 
  group 
  in 
  the 
  Brighton 
  Museum, 
  exhibit 
  ring-vertebra3 
  

   which 
  probably 
  belong 
  to 
  this 
  fish. 
  

  

  Lophiostomus 
  dixoni, 
  Egerton. 
  

   1852. 
  Lophiostomus 
  dixoni, 
  Sir 
  P. 
  Egerton, 
  loc. 
  cit. 
  no. 
  10, 
  pis. 
  x., 
  x*. 
  

   1888. 
  Lophiostomus 
  dixoni, 
  A. 
  S. 
  Woodward, 
  Proc. 
  Geol. 
  Assoc, 
  vol. 
  x. 
  

   p. 
  303. 
  

  

  Type. 
  Head 
  with 
  part 
  of 
  abdominal 
  region 
  ; 
  British 
  Museum. 
  

  

  The 
  type 
  species, 
  with 
  head 
  attaining 
  a 
  length 
  of 
  0'06. 
  External 
  

   bones 
  and 
  fin-rays 
  ornamented 
  with 
  closely 
  -arranged 
  short 
  rugae 
  

   and 
  tubercles 
  of 
  ganoine. 
  Maximum 
  width 
  of 
  cranial 
  roof 
  exceed- 
  

   ing 
  two-thirds 
  of 
  its 
  length; 
  the 
  paired 
  frontal 
  prominences 
  narrow 
  

   and 
  laterally 
  compressed 
  but 
  much 
  elevated, 
  the 
  height 
  of 
  each 
  

   exceeding 
  half 
  the 
  distance 
  between 
  them. 
  Marginal 
  teeth 
  in 
  one 
  

   regular 
  series, 
  some 
  exhibiting 
  feeble 
  vertical 
  wrinkles 
  in 
  their 
  

   apical 
  portion 
  ; 
  mandibular 
  ramus 
  about 
  three 
  and 
  a 
  half 
  times 
  as 
  

   long 
  as 
  its 
  maximum 
  depth. 
  Branchiostegal 
  rays 
  about 
  12 
  in 
  

   number, 
  nearly 
  all 
  ornamented 
  ; 
  gular 
  plate 
  as 
  long 
  as 
  the 
  denti- 
  

   gerous 
  portion 
  of 
  the 
  mandible, 
  and 
  at 
  least 
  two-thirds 
  as 
  broad 
  as 
  

   long. 
  Ornament 
  of 
  fin-rays 
  consisting 
  chiefly 
  of 
  oblique 
  wrinkles. 
  

   Hinder 
  border 
  of 
  scales 
  with 
  coarse, 
  long, 
  acuminate 
  pectinations, 
  

   continued 
  on 
  the 
  outer 
  face 
  of 
  the 
  principal 
  scales 
  as 
  oblique 
  

   wrinkles 
  or 
  elongated 
  pits. 
  

  

  Form. 
  Sf 
  Loc. 
  Senonian 
  • 
  Sussex 
  and 
  Kent. 
  

  

  23023. 
  The 
  type 
  specimen, 
  described 
  and 
  figured 
  by 
  Egerton, 
  loc. 
  

   cit. 
  ; 
  Alfriston, 
  Sussex. 
  The 
  comparatively 
  smooth 
  plate 
  

   named 
  " 
  scapula," 
  is 
  evidently 
  one 
  of 
  the 
  postclavicular 
  

   series. 
  Presented 
  by 
  Capt. 
  J. 
  L. 
  Beckford, 
  R.N. 
  

  

  P. 
  1116. 
  Scales 
  and 
  an 
  associated 
  bone-fragment 
  ; 
  Alfriston. 
  

  

  Egerton 
  Coll. 
  

  

  P. 
  5409. 
  Portion 
  of 
  fin-ray 
  and 
  two 
  imperfect 
  scales 
  ; 
  Sussex. 
  

  

  Presented 
  by 
  P. 
  E. 
  Coombe, 
  Esq., 
  1888. 
  

  

  39121. 
  Group 
  of 
  scales 
  and 
  remains 
  of 
  fin-rays 
  ; 
  Maidstone. 
  

  

  Bowerbciiih 
  Coll. 
  

  

  P. 
  4263. 
  Scales 
  apparently 
  with 
  imperfect 
  ring-vertebra? 
  ; 
  Lewes. 
  

  

  Enniskillen 
  Coll. 
  

  

  