﻿140 
  ACTINOPTERYGII. 
  

  

  19430-31. 
  A 
  small 
  trunk 
  with 
  opercular 
  bones, 
  in 
  counterpart; 
  

   Barrow-on-Soar. 
  Maximum 
  depth 
  of 
  trunk 
  0*049, 
  and 
  

   length 
  (without 
  caudal 
  fin) 
  # 
  06. 
  

  

  Presented 
  by 
  the 
  Earl 
  of 
  Aylesford, 
  1845. 
  

  

  40176. 
  A 
  very 
  small 
  fish 
  displaying 
  the 
  reticulations 
  on 
  the 
  oper- 
  

   culum 
  ; 
  Barrow-on-Soar. 
  Purchased, 
  1866. 
  

  

  P. 
  7432. 
  Small 
  distorted 
  fish 
  ; 
  probably 
  from 
  Barrow-on-Soar. 
  

  

  Presented 
  by 
  Edward 
  Gibson, 
  Esq. 
  

  

  P. 
  4424. 
  Greater 
  portion 
  of 
  small 
  fish 
  with 
  well-preserved 
  pectoral 
  

   fin; 
  Barrow-on-Soar. 
  Enniskillen 
  Coll. 
  

  

  Dapedius 
  colei, 
  Agassiz. 
  

  

  1835. 
  Dapedius 
  colei, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  pp. 
  195, 
  217, 
  

   pi. 
  xxv. 
  b. 
  figs. 
  1-7, 
  pi. 
  xxv. 
  c. 
  

  

  Type. 
  Imperfect 
  head 
  and 
  trunk 
  ; 
  British 
  Museum. 
  

  

  A 
  species 
  nearly 
  equalling 
  D. 
  politus 
  in 
  size. 
  Maximum 
  depth 
  

   of 
  trunk 
  about 
  equal 
  to 
  its 
  length 
  (exclusive 
  of 
  the 
  caudal 
  fin) 
  and 
  

   four 
  times 
  as 
  great 
  as 
  the 
  depth 
  of 
  the 
  caudal 
  pedicle. 
  Head 
  with 
  

   opercular 
  apparatus 
  occupying 
  nearly 
  one-quarter 
  of 
  the 
  total 
  length 
  ; 
  

   the 
  external 
  bones 
  feebly 
  ornamented 
  with 
  fine, 
  sparse, 
  rounded 
  

   tubercles, 
  usually 
  arranged 
  on 
  the 
  cranial 
  roof 
  on 
  the 
  radiating 
  lines 
  

   of 
  growth. 
  Marginal 
  teeth 
  very 
  robust, 
  and 
  the 
  majority 
  bifid. 
  

   Scales 
  smooth, 
  comparatively 
  thin, 
  rarely 
  exhibiting 
  punctations, 
  

   and 
  apparently 
  not 
  serrated. 
  

  

  This 
  species 
  seems 
  to 
  be 
  satisfactorily 
  defined, 
  but 
  in 
  the 
  case 
  of 
  

   fragmentary 
  and 
  abraded 
  specimens 
  it 
  is 
  not 
  always 
  possible 
  to 
  

   distinguish 
  between 
  those 
  that 
  may 
  be 
  placed 
  here 
  and 
  examples 
  of 
  

   D. 
  punctatus, 
  D. 
  orbis, 
  or 
  immature 
  D. 
  granulatus. 
  

  

  Form. 
  <$[■ 
  Log. 
  Lower 
  Lias 
  : 
  Dorsetshire. 
  

  

  The 
  following 
  specimens 
  were 
  all 
  obtained 
  from 
  the 
  neighbourhood 
  

   of 
  Lyme 
  Eegis 
  : 
  — 
  

  

  P. 
  3545. 
  Type 
  specimen 
  described 
  and 
  figured 
  by 
  Agassiz, 
  loc. 
  cit. 
  

   p. 
  195, 
  pi. 
  xxv. 
  b. 
  The 
  lower 
  marginal 
  teeth 
  appear 
  to 
  

   be 
  all 
  bifid, 
  and 
  the 
  right 
  hyomandibular 
  bone 
  is 
  well 
  

   exposed. 
  The 
  specimen 
  is 
  much 
  abraded, 
  and 
  the 
  opercular 
  

   bones 
  are 
  thus 
  unusually 
  smooth, 
  while 
  the 
  lines 
  of 
  growth 
  

   of 
  some 
  of 
  the 
  scales 
  are 
  rendered 
  conspicuous. 
  

  

  EnnisJcillen 
  Coll. 
  

  

  P. 
  7427. 
  A 
  nearly 
  complete 
  but 
  much 
  fractured 
  fish, 
  described 
  and 
  

   figured 
  by 
  Agassiz, 
  loc. 
  cit. 
  p. 
  217, 
  pi. 
  xxv. 
  c. 
  

  

  Old 
  Collection. 
  

  

  