﻿SEMIONOTID^l. 
  137 
  

  

  P. 
  3537 
  a. 
  Somewhat 
  smaller 
  and 
  more 
  elongated 
  fish. 
  

  

  Enniskillen 
  Coll. 
  

  

  P. 
  6178. 
  Imperfect 
  much 
  elongated 
  fish 
  0*075 
  in 
  length, 
  in 
  counter- 
  

   part. 
  Purchased, 
  1890. 
  

  

  Dapedius 
  radiatus 
  (Agassiz). 
  

   1836-44. 
  Tetragonolepis 
  radiatus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  

  

  p. 
  201, 
  pi. 
  xxiii. 
  a. 
  fig. 
  2. 
  

   1854. 
  JEchmodus 
  radiatus, 
  J. 
  Morris, 
  Catal. 
  Brit. 
  Foss. 
  p. 
  317. 
  

  

  Type. 
  Imperfect 
  head 
  and 
  trunk 
  ; 
  British 
  Museum. 
  

  

  A 
  small 
  species 
  or 
  variety 
  differing 
  only 
  from 
  the 
  young 
  of 
  

   D. 
  politics 
  (so-called 
  D. 
  leiosomus) 
  in 
  the 
  prominence 
  of 
  the 
  pectina- 
  

   tions 
  and 
  crenulations 
  on 
  all 
  the 
  flank-scales. 
  Whether 
  or 
  & 
  not 
  this 
  

   character 
  is 
  due 
  to 
  the 
  superficial 
  abrasion 
  of 
  the 
  scales, 
  still 
  remains 
  

   to 
  be 
  determined. 
  

  

  Form. 
  Sf 
  Log. 
  Lower 
  Lias 
  : 
  Lyme 
  Begis, 
  Dorsetshire. 
  

  

  P. 
  468. 
  Type 
  specimen. 
  Egerton 
  Coll. 
  

  

  28716. 
  Head 
  and 
  lower 
  portion 
  of 
  the 
  trunk 
  of 
  an 
  equally 
  orna- 
  

   mented 
  fish. 
  Purchased, 
  1853. 
  

  

  35559. 
  A 
  partially 
  distorted 
  specimen 
  0*115 
  in 
  length, 
  with 
  crenu- 
  

   lated 
  scales. 
  Purchased, 
  1855. 
  

  

  35722. 
  Another 
  feebly 
  ornamented 
  specimen 
  0"145 
  in 
  length, 
  

   wanting 
  the 
  greater 
  part 
  of 
  the 
  head 
  and 
  ventral 
  region. 
  

  

  Purchased, 
  1859. 
  

  

  P. 
  1564. 
  A 
  specimen 
  much 
  resembling 
  the 
  type, 
  but 
  with 
  more 
  

   feebly 
  ornamented 
  scales 
  and 
  exhibiting 
  more 
  of 
  the 
  

   trunk. 
  Egerton 
  Coll. 
  

  

  P. 
  3537 
  b. 
  Small 
  comparatively 
  elongated 
  fish 
  0*088 
  in 
  length, 
  with 
  

   ornate 
  scales. 
  Enniskillen 
  Coll. 
  

  

  Dapedius 
  orbis, 
  Agassiz. 
  

   1836. 
  Dapedius 
  orbis, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  p. 
  218, 
  

  

  pi. 
  xxv. 
  d. 
  

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

  

  Type. 
  Fish, 
  wanting 
  tail. 
  

  

  A 
  large 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0*45. 
  Maximum 
  

   depth 
  of 
  trunk 
  nearly 
  equal 
  to 
  its 
  length 
  (exclusive 
  of 
  the 
  caudal 
  

   fin) 
  and 
  about 
  four 
  times 
  as 
  great 
  as 
  the 
  depth 
  of 
  the 
  caudal 
  pedicle. 
  

   Head 
  with 
  opercular 
  apparatus 
  occupying 
  somewhat 
  less 
  than 
  one- 
  

  

  