﻿148 
  ACTINOPTERYGII. 
  

  

  on 
  the 
  opercular 
  and 
  cheek-plates. 
  Teeth 
  robust, 
  unicuspid 
  in 
  the 
  

   marginal 
  series 
  of 
  the 
  mandible. 
  Tubercles 
  on 
  the 
  dorsal 
  and 
  

   ventral 
  scales 
  very 
  coarse 
  and 
  usually 
  fused 
  into 
  rugae 
  ; 
  the 
  scales 
  

   of 
  the 
  flank 
  scarcely 
  deeper 
  than 
  broad, 
  not 
  serrated, 
  and 
  covered 
  

   with 
  smooth 
  enamel, 
  which 
  exhibits 
  a 
  coarse 
  rugosity 
  or 
  digitation 
  

   towards 
  the 
  anterior 
  border. 
  

  

  Form. 
  Sf 
  Log. 
  Upper 
  Lias 
  : 
  Wiirtemberg. 
  

  

  19659. 
  Pish 
  about 
  0-43 
  in 
  length, 
  with 
  very 
  imperfectly 
  preserved 
  

   head 
  and 
  abdominal 
  region, 
  but 
  displaying 
  the 
  general 
  

   form 
  and 
  proportions 
  and 
  some 
  of 
  the 
  scales 
  ; 
  Boll. 
  

  

  Purchased, 
  1845. 
  

  

  19659 
  a. 
  More 
  imperfect 
  fish, 
  in 
  counterpart, 
  exhibiting 
  the 
  squa- 
  

   mation, 
  the 
  operculum 
  and 
  suboperculum, 
  remains 
  of 
  

   some 
  of 
  the 
  head-bones, 
  and 
  the 
  lower 
  marginal 
  teeth 
  ; 
  

   Boll. 
  Purchased, 
  1845. 
  

  

  P. 
  7429. 
  Similar 
  specimen 
  with 
  well-preserved 
  scales 
  and 
  opercular 
  

   bones. 
  Purchased. 
  

  

  P. 
  2015-6. 
  Two 
  imperfect 
  specimens. 
  Egerton 
  Coll. 
  

  

  Dapedius 
  granulatus, 
  Agassiz. 
  

  

  1835. 
  Dapedius 
  granulatus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  p. 
  190, 
  

  

  pi. 
  xxv. 
  figs. 
  2-6. 
  

   1836-43. 
  Tetragonolepis 
  pustulatus, 
  L. 
  Agassiz, 
  ibid. 
  p. 
  201, 
  pi. 
  xxiii. 
  c. 
  

  

  [Anterior 
  portion 
  of 
  fish 
  ; 
  British 
  Museum.] 
  

   1849. 
  Dapidius 
  granulosus, 
  W. 
  C. 
  Williamson, 
  Phil. 
  Trans, 
  p. 
  445, 
  

  

  pi. 
  xl. 
  figs. 
  5, 
  6. 
  

   1854. 
  JEchmodus 
  pustulatus, 
  J. 
  Morris, 
  Oatal. 
  Brit. 
  Foss. 
  p. 
  317. 
  

   1888. 
  Dapedius 
  cy 
  chides, 
  W. 
  Deecke, 
  Mittheil. 
  Comm. 
  Geol. 
  Landes- 
  

  

  Unters. 
  Elsass-Lothringen, 
  vol. 
  i. 
  p. 
  209, 
  pi. 
  iii. 
  [Nearly 
  complete 
  

  

  fish 
  ; 
  collection 
  of 
  Herr 
  Fiirst, 
  Buprechtsau, 
  near 
  Strassburg.] 
  

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

  

  Vertebrata, 
  p. 
  58. 
  

  

  Type. 
  Imperfect 
  head 
  and 
  anterior 
  abdominal 
  region 
  ; 
  Oxford 
  

   Museum. 
  

  

  The 
  largest 
  known 
  species, 
  attaining 
  a 
  length 
  of 
  0-6. 
  Maximum 
  

   depth 
  of 
  trunk 
  equalling 
  or 
  slightly 
  exceeding 
  its 
  length 
  (exclusive 
  

   of 
  the 
  caudal 
  fin) 
  and 
  about 
  four 
  and 
  a 
  half 
  times 
  as 
  great 
  as 
  the 
  

   depth 
  of 
  the 
  caudal 
  pedicle. 
  Head 
  with 
  opercular 
  apparatus 
  

   occupying 
  one-quarter 
  of 
  the 
  total 
  length 
  of 
  the 
  fish; 
  the 
  external 
  

   bones 
  ornamented 
  with 
  numerous 
  coarse, 
  rounded 
  tuberculations, 
  

   very 
  rarely 
  fused 
  into 
  rugae. 
  Marginal 
  teeth 
  stout, 
  the 
  majority 
  

  

  