﻿146 
  ACTESTOPTERTGII. 
  

  

  1858. 
  Dapedius 
  pholidotus, 
  F. 
  A. 
  Quenstedt, 
  Der 
  Jura, 
  p. 
  228, 
  pi. 
  xxxi. 
  

  

  figs. 
  1-7. 
  

   1860. 
  Tetragonolepis 
  pholidotus, 
  A. 
  Wagner, 
  Sitzungsb. 
  k. 
  bay. 
  Akad. 
  

  

  Wiss. 
  p. 
  41. 
  

  

  Type. 
  Imperfectly 
  preserved 
  fish 
  ; 
  Stuttgart 
  Museum. 
  

  

  A 
  small 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  025-03. 
  Maximum 
  

   depth 
  of 
  trunk 
  three-quarters 
  as 
  great 
  as 
  its 
  length 
  (exclusive 
  of 
  

   the 
  caudal 
  fin) 
  and 
  equalling 
  nearly 
  four 
  times 
  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 
  large, 
  rounded 
  tuberculations, 
  sometimes 
  fused 
  into 
  

   short 
  rugse 
  on 
  the 
  cranial 
  roof 
  and 
  facial 
  bones. 
  Marginal 
  teeth 
  

   unicuspid 
  and 
  comparatively 
  slender. 
  Scales 
  smooth 
  or 
  faintly 
  

   wrinkled 
  in 
  the 
  anterior 
  half, 
  and 
  the 
  hinder 
  border 
  not 
  serrated 
  ; 
  

   tuberculations 
  absent 
  on 
  all 
  the 
  ventral 
  scales 
  except 
  the 
  ridge- 
  

   series, 
  where 
  they 
  are 
  represented 
  chiefly 
  by 
  elongated 
  rugae. 
  

  

  Form. 
  Sf 
  Loc. 
  Upper 
  Lias 
  : 
  Wurtemberg 
  and 
  Normandy. 
  

  

  36049. 
  Typical 
  specimen 
  about 
  0*275 
  in 
  length, 
  wanting 
  the 
  bones 
  

   on 
  the 
  exposed 
  left 
  side 
  of 
  the 
  head, 
  the 
  paired 
  fins, 
  the 
  

   dorsal 
  fin, 
  and 
  the 
  greater 
  part 
  of 
  the 
  anal 
  fin 
  ; 
  Lias 
  e, 
  

   Metzingen, 
  near 
  Eeutlingen. 
  Purchased, 
  1861. 
  

  

  P. 
  1574 
  a, 
  P. 
  1563 
  b, 
  C, 
  P. 
  1573. 
  A 
  similar 
  specimen 
  showing 
  the 
  

   marginal 
  teeth 
  and 
  part 
  of 
  the 
  cranial 
  roof; 
  also 
  two 
  

   very 
  imperfect 
  fishes 
  wanting 
  the 
  dorsal 
  region 
  and 
  a 
  

   fragmentary 
  small 
  specimen 
  ; 
  Ohmden, 
  near 
  Boll. 
  

  

  Egerton 
  Coll. 
  

  

  P. 
  3568-9. 
  Three 
  large 
  fishes 
  with 
  imperfect 
  fins, 
  all 
  showing 
  part 
  

   of 
  the 
  dentition 
  and 
  one 
  well 
  displaying 
  the 
  squamation 
  ; 
  

   also 
  remains 
  of 
  a 
  small 
  head, 
  with 
  the 
  impression 
  of 
  some 
  

   anterior 
  scales 
  and 
  a 
  pectoral 
  fin 
  ; 
  Ohmden. 
  

  

  EnnisJcillen 
  Coll. 
  

  

  P. 
  4401. 
  Another 
  imperfect 
  large 
  fish, 
  exhibiting 
  an 
  inner 
  view 
  of 
  

   the 
  left 
  opercular 
  and 
  branchiostegal 
  apparatus 
  ; 
  Ohmden. 
  

  

  Enniskillen 
  Coll. 
  

  

  18512. 
  Head 
  and 
  the 
  greater 
  part 
  of 
  the 
  squamation 
  of 
  a 
  large 
  

   individual 
  ; 
  Ohmden. 
  Some 
  of 
  the 
  teeth 
  and 
  the 
  super- 
  

   ficial 
  ornament 
  are 
  well 
  shown. 
  Purchased, 
  1844. 
  

  

  19660-61. 
  Two 
  very 
  imperfect 
  fishes, 
  exhibiting 
  part 
  of 
  the 
  super- 
  

   ficial 
  ornament 
  and 
  a 
  large 
  portion 
  of 
  the 
  squamation; 
  

   Boll. 
  Purchased, 
  1845. 
  

  

  