﻿138 
  ACTINOPTEEYGTI. 
  

  

  quarter 
  of 
  the 
  total 
  length 
  of 
  the 
  fish 
  ; 
  the 
  external 
  bones 
  orna- 
  

   mented 
  with 
  numerous 
  coarse, 
  rounded 
  tuberculations 
  not 
  fused 
  

   into 
  rugae. 
  Marginal 
  teeth 
  very 
  stout 
  and 
  obtuse, 
  the 
  majority 
  

   slightly 
  bifid. 
  Scales 
  comparatively 
  thick 
  and 
  nearly 
  smooth, 
  with 
  

   few 
  sparse 
  punctations 
  and 
  extremely 
  delicate 
  transverse 
  striae 
  ; 
  

   hinder 
  border 
  not 
  serrated. 
  

  

  Form. 
  <Sr 
  Loc. 
  Lower 
  Lias 
  : 
  Leicestershire. 
  

  

  The 
  following 
  specimens 
  were 
  all 
  obtained 
  from 
  Barrow-on-Soar 
  : 
  — 
  

  

  P. 
  7423-24. 
  Two 
  fine 
  large 
  specimens, 
  much 
  fractured 
  but 
  exhibit- 
  

   ing 
  the 
  principal 
  characters 
  of 
  the 
  species. 
  Purchased. 
  

  

  P. 
  7425. 
  A 
  smaller 
  more 
  imperfect 
  fish 
  displaying 
  one 
  of 
  the 
  pelvic 
  

   fins 
  and 
  some 
  teeth. 
  Purchased. 
  

  

  P. 
  7426. 
  Very 
  imperfectly 
  preserved 
  head 
  and 
  trunk 
  with 
  traces 
  of 
  

   the 
  fins. 
  Part 
  of 
  the 
  dentition 
  is 
  conspicuous, 
  the 
  tubercles 
  

   on 
  some 
  of 
  the 
  head-bones 
  are 
  shown 
  in 
  impression, 
  and 
  

   a 
  few 
  of 
  the 
  haemal 
  spines 
  are 
  exposed 
  at 
  the 
  base 
  of 
  the 
  

   caudal 
  fin. 
  Purchased. 
  

  

  P. 
  3549-a. 
  Two 
  small 
  specimens, 
  the 
  second 
  wanting 
  the 
  caudal 
  fin 
  

   and 
  the 
  greater 
  part 
  of 
  the 
  head, 
  but 
  displaying 
  the 
  orna- 
  

   ment 
  on 
  some 
  of 
  the 
  suborbital 
  and 
  opercular 
  bones, 
  many 
  

   well-preserved 
  scales, 
  and 
  the 
  dorsal 
  and 
  anal 
  fins. 
  

  

  Enniskillen 
  Coll. 
  

  

  18789. 
  Portion 
  of 
  small 
  head 
  and 
  trunk 
  showing 
  the 
  depth 
  of 
  the 
  

   dorsal 
  fin. 
  Purchased, 
  1845. 
  

  

  Dapedius 
  dorsalis 
  (Agassiz). 
  

  

  1836. 
  Tetragonolepis 
  dorsalis, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  p. 
  211, 
  

  

  pi. 
  xxi. 
  figs. 
  1, 
  2, 
  pi. 
  xxi. 
  a. 
  fig. 
  1. 
  

   1836. 
  Tetragonolepis 
  monilifer, 
  L. 
  Agassiz, 
  ibid. 
  p. 
  212, 
  pi. 
  xxi. 
  a. 
  

  

  figs. 
  2-5. 
  [Fish, 
  wanting 
  head 
  ; 
  Bristol 
  Museum.] 
  

   1844. 
  Tetragonolepis 
  striolatus, 
  L. 
  Agassiz, 
  ibid. 
  p. 
  304 
  (name 
  only). 
  

  

  [British 
  Museum.] 
  

   1854. 
  JEchmodus 
  dorsalis, 
  J. 
  Morris, 
  Oatal. 
  Brit. 
  Foss. 
  p. 
  316. 
  

   1854. 
  Dapedius 
  monilifer, 
  J. 
  Morris, 
  ibid. 
  p. 
  324. 
  

   1890. 
  Dapedius 
  dorsalis, 
  Woodward 
  & 
  Sherborn, 
  Catal. 
  Brit. 
  Foss. 
  

  

  Vertebrata, 
  p. 
  58. 
  

   1890. 
  Dapedius 
  monilifer, 
  Woodward 
  & 
  Sherborn, 
  ibid. 
  p. 
  59. 
  

   1890. 
  Dapedius 
  dorsalis, 
  M. 
  Browne, 
  Trans. 
  Leicester 
  Lit. 
  & 
  Phil. 
  Soc. 
  

  

  n. 
  s., 
  vol. 
  ii. 
  p. 
  202. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  British 
  Museum. 
  

  

  