﻿SEMIONOTID^E. 
  145 
  

  

  36883. 
  Head 
  wanting 
  mandibular 
  ramus 
  and 
  facial 
  bones 
  of 
  the 
  

   left 
  side, 
  displaying 
  those 
  of 
  the 
  right 
  side 
  from 
  within. 
  

   The 
  outer 
  teeth 
  are 
  the 
  largest, 
  with 
  a 
  simple 
  obtuse 
  

   apex, 
  and 
  many 
  of 
  the 
  inner 
  teeth 
  are 
  either 
  indented 
  or 
  

   slightly 
  bifid. 
  The 
  vomer 
  exhibits 
  relatively 
  large 
  stout 
  

   teeth, 
  and 
  the 
  outer 
  edges 
  of 
  the 
  pterygoid 
  arcade 
  and 
  

   splenial 
  are 
  similarly 
  armed 
  ; 
  but 
  on 
  the 
  inner 
  face 
  of 
  the 
  

   two 
  latter 
  elements 
  the 
  teeth 
  are 
  merely 
  small 
  tubercles, 
  

   The 
  epihyal 
  is 
  much 
  contracted 
  at 
  its 
  proximal 
  end, 
  and 
  

   the 
  ceratohyal 
  is 
  remarkably 
  short 
  and 
  deep. 
  

  

  Purchased, 
  1862. 
  

  

  P. 
  1589. 
  Remains 
  of 
  mandible 
  and 
  portions 
  of 
  surrounding 
  bones. 
  

  

  Egerton 
  Coll, 
  

  

  Dapedius 
  angulifer 
  (Agassiz). 
  

  

  1832-33. 
  Tetragonolepis 
  trailli, 
  L. 
  Agassiz, 
  Neues 
  Jahrb. 
  1832, 
  p. 
  147, 
  

  

  and 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  p. 
  7. 
  

   1835-36. 
  Tetragonolepis 
  angulifer, 
  L. 
  Agassiz, 
  ibid. 
  p. 
  213, 
  pi. 
  xxii 
  . 
  

   1854. 
  jEehmodus 
  angulifer, 
  J. 
  Morris, 
  Catal. 
  Brit. 
  Foss. 
  p. 
  317. 
  

  

  Type. 
  Nearly 
  complete 
  fish. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0'5. 
  Maximum 
  depth 
  of 
  

   trunk 
  not 
  quite 
  equal 
  to 
  its 
  length 
  (exclusive 
  of 
  the 
  caudal 
  fin) 
  and 
  

   somewhat 
  more 
  than 
  three 
  and 
  a 
  half 
  times 
  as 
  great 
  as 
  the 
  depth 
  

   of 
  the 
  caudal 
  pedicle. 
  Marginal 
  teeth 
  unicuspid. 
  Scales 
  of 
  flank 
  

   smooth, 
  none 
  much 
  deeper 
  than 
  broad, 
  and 
  each 
  marked 
  externally 
  

   with 
  a 
  triangular 
  depression 
  of 
  which 
  the 
  base 
  coincides 
  with 
  the 
  

   hinder 
  border 
  while 
  the 
  apex 
  is 
  turned 
  forwards. 
  {Agassiz.} 
  

  

  Form, 
  fy 
  Loc. 
  Lower 
  Lias 
  : 
  Stratford-on-Avon, 
  Warwickshire. 
  

  

  Known 
  only 
  by 
  the 
  unique 
  type 
  specimen, 
  which 
  cannot 
  now 
  be 
  

   traced. 
  

  

  Dapedius 
  pholidotus, 
  Agassiz, 
  

  

  1832. 
  Tetragonolepis 
  pholidotus, 
  L. 
  Agassiz, 
  Neues 
  Jahrb. 
  p. 
  147. 
  

   (?) 
  1832. 
  Tetragonolepis 
  heteroderma, 
  L. 
  t 
  Agassiz, 
  ibid. 
  p. 
  147. 
  

   1833-44. 
  Tetragonolepis 
  pholidotus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  

  

  pp. 
  7, 
  207, 
  pi. 
  xxiii. 
  e. 
  fig. 
  2. 
  

   (?) 
  1833-44. 
  Tetragonolepis 
  heteroderma, 
  L. 
  Agassiz, 
  ibid. 
  pp. 
  7, 
  206, 
  

  

  pi. 
  xxiii. 
  e. 
  fig. 
  1. 
  [Portion 
  of 
  squaniation 
  ; 
  Hartmann 
  Coll.] 
  

   1843. 
  Tetragonolepis 
  pholidotus, 
  F. 
  A. 
  Quenstedt, 
  Flozgeb. 
  Wiirttemb. 
  

  

  p. 
  238. 
  

   1852. 
  Dapedius 
  pholidotus, 
  F. 
  A. 
  Quenstedt, 
  Handb. 
  Petrefakt. 
  p. 
  203, 
  

  

  pi. 
  xvii. 
  figs. 
  1, 
  3-5. 
  

   1854. 
  jEchmodus 
  pholidotus, 
  J. 
  Morris, 
  Catal. 
  Brit. 
  Foss. 
  p. 
  317. 
  

  

  PART 
  III. 
  L 
  

  

  