﻿530 
  ACTINOPTERYG-1I. 
  

  

  appears 
  to 
  be 
  related 
  to 
  Thrissops, 
  but 
  it 
  is 
  too 
  imperfectly 
  known 
  

   for 
  definite 
  reference. 
  The 
  type 
  species 
  is 
  E. 
  brongniarti 
  (H. 
  E. 
  

   Sauvage, 
  ibid. 
  p. 
  629, 
  pi. 
  xiii. 
  fig. 
  2), 
  founded 
  on 
  a 
  fish 
  wanting 
  the 
  

   end 
  of 
  the 
  caudal 
  region 
  but 
  originally 
  about 
  0*1 
  in 
  length, 
  from 
  

   the 
  Kimmeridgian 
  of 
  Morestel, 
  Isere. 
  Both 
  dorsal 
  and 
  anal 
  fins 
  

   are 
  extended 
  and 
  the 
  pelvic 
  fins 
  are 
  remote, 
  arising 
  immediately 
  in 
  

   advance 
  of 
  the 
  origin 
  of 
  the 
  dorsal. 
  

  

  The 
  undefined 
  generic 
  name 
  Cteuolepis 
  (L. 
  Agassiz, 
  Poiss. 
  Eoss. 
  

   vol. 
  ii. 
  pt. 
  ii. 
  1844, 
  p. 
  180) 
  is 
  applied 
  to 
  certain 
  detached 
  scales 
  of 
  

   Bathonian 
  age, 
  which 
  probably 
  belong 
  to 
  a 
  member 
  either 
  of 
  the 
  

   Oligopleuridae 
  or 
  of 
  the 
  Leptolepidse. 
  The 
  typical 
  species 
  is 
  

   C. 
  cydus 
  (L. 
  Agassiz, 
  ibid. 
  p. 
  180 
  ; 
  A. 
  S. 
  Woodward, 
  Proc. 
  Geol. 
  

   Assoc, 
  vol. 
  xi. 
  1890, 
  p. 
  301, 
  and 
  vol. 
  xii. 
  1892, 
  p. 
  241, 
  pi. 
  iv. 
  

   figs. 
  5-8 
  ; 
  figures 
  by 
  C. 
  Prevost, 
  Ann. 
  Sci. 
  Nat. 
  vol. 
  iv. 
  1825, 
  

   pi. 
  xviii. 
  fig. 
  21, 
  and 
  by 
  J. 
  Phillips, 
  Geol. 
  Oxford, 
  1871, 
  p. 
  182, 
  

   fig. 
  41, 
  nos. 
  1-4) 
  from 
  the 
  Stonesfield 
  Slate, 
  Stonesfield, 
  Oxfordshire. 
  

   The 
  scales 
  have 
  only 
  been 
  found 
  detached 
  and 
  are 
  mostly 
  imperfect. 
  

   They 
  must 
  have 
  been 
  very 
  deeply 
  imbricating, 
  and 
  the 
  anterior 
  

   overlapped 
  border 
  is 
  ragged, 
  a 
  few 
  radiating 
  grooves 
  extending 
  to 
  it 
  

   from 
  the 
  centre 
  of 
  the 
  scale 
  ; 
  the 
  relatively 
  small 
  exposed 
  area 
  is 
  

   invested 
  with 
  smooth 
  ganoine 
  which 
  exhibits 
  sparse 
  punctations 
  ; 
  

   and 
  the 
  hinder 
  border 
  is 
  either 
  entire 
  or 
  only 
  feebly 
  crenulated. 
  

   The 
  following 
  scales 
  from 
  Stonesfield 
  are 
  of 
  this 
  character 
  : 
  — 
  

  

  P. 
  745, 
  P. 
  3354. 
  Four 
  typical 
  scales 
  figured 
  in 
  Proc. 
  Geol. 
  Assoc, 
  

   vol. 
  xii. 
  (1892), 
  pi. 
  iv. 
  figs. 
  5-8. 
  

  

  Egerton 
  <$f 
  Enniskillen 
  Colls. 
  

  

  P. 
  745 
  a-g, 
  P. 
  3354 
  a-k. 
  Eighteen 
  specimens. 
  

  

  Egerton 
  6f 
  Enniskillen 
  Colls. 
  

  

  47981. 
  One 
  scale. 
  Presented 
  by 
  the 
  Hon. 
  Robert 
  Marsham, 
  1877. 
  

  

  