﻿SEMIONOTIDJE. 
  147 
  

  

  22525. 
  Remains 
  of 
  head 
  and 
  abdominal 
  region, 
  with 
  the 
  pectoral 
  

   fin 
  and 
  some 
  of 
  the 
  superficial 
  ornament 
  in 
  impression; 
  

   Boll. 
  Purchased, 
  1848. 
  

  

  P. 
  1563 
  d. 
  Portion 
  of 
  squamation 
  ; 
  Boll. 
  Egerton 
  Coll. 
  

  

  The 
  following 
  specimens 
  bear 
  the 
  specific 
  name 
  of 
  Dapedius 
  

   ovcdis 
  (Tetragonolepis 
  ovalis, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  

   1836, 
  p. 
  209, 
  pi. 
  xxi. 
  fig. 
  3), 
  and 
  were 
  also 
  referred 
  to 
  the 
  genus 
  

   JEchmodus 
  by 
  Egerfcon 
  (J. 
  Morris, 
  Catal. 
  Brit. 
  Toss. 
  1854, 
  p. 
  317). 
  

   They 
  seem 
  to 
  differ 
  only 
  from 
  D. 
  pholidotus 
  in 
  the 
  slightly 
  more 
  

   elongated 
  form 
  of 
  the 
  trunk, 
  and 
  are 
  regarded 
  as 
  constituting 
  

   a 
  variety 
  of 
  this 
  species 
  by 
  Quenstedt 
  (Handb. 
  Petrefakt. 
  1852, 
  

   p. 
  203). 
  

  

  P. 
  1563 
  a. 
  Type 
  specimen 
  of 
  D. 
  ovalis 
  described 
  and 
  figured 
  by 
  

   Agassiz, 
  loc. 
  cit. 
  ; 
  Boll. 
  Egerton 
  Coll. 
  

  

  P. 
  3572. 
  Head 
  and 
  trunk 
  of 
  a 
  fish 
  about 
  0*22 
  in 
  length, 
  wanting 
  

   the 
  caudal 
  pedicle 
  and 
  fin, 
  labelled 
  by 
  Agassiz 
  ; 
  Ohmden. 
  

  

  Enniskillen 
  Coll. 
  

  

  P. 
  1563 
  e. 
  Specimen 
  0*17 
  in 
  length, 
  chiefly 
  shown 
  as 
  an 
  impression 
  ; 
  

   Boll. 
  Egerton 
  Coll. 
  

  

  P. 
  3571. 
  Impression 
  of 
  slightly 
  larger 
  fish, 
  labelled 
  by 
  Agassiz; 
  

   Ohmden. 
  EnnisJcillen 
  Coll. 
  

  

  32448. 
  Fine 
  specimen 
  about 
  0-145 
  in 
  length 
  to 
  the 
  base 
  of 
  the 
  caudal 
  

   fin, 
  wanting 
  the 
  greater 
  part 
  of 
  the 
  fins 
  ; 
  Upper 
  Lias, 
  

   Curcy, 
  Normandy. 
  The 
  parietal, 
  frontal, 
  and 
  squamosal 
  

   bones 
  are 
  separate. 
  Tesson 
  Coll. 
  

  

  Dapedius 
  caelatus, 
  Quenstedt. 
  

  

  1858. 
  Dapedius 
  caelatus, 
  F. 
  A. 
  Quenstedt, 
  Der 
  Jura, 
  p. 
  226, 
  pi. 
  xxviii. 
  

  

  figs. 
  1, 
  2. 
  

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

  

  Wiss. 
  p. 
  40. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Tubingen 
  University 
  Museum. 
  

  

  An 
  elongated 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*45. 
  Length 
  

   of 
  trunk 
  (exclusive 
  of 
  the 
  caudal 
  fin) 
  one 
  and 
  a 
  half 
  times 
  as 
  great 
  

   as 
  its 
  maximum 
  depth, 
  and 
  the 
  latter 
  equalling 
  thrice 
  the 
  depth 
  

   of 
  the 
  caudal 
  pedicle. 
  Head 
  with 
  opercular 
  apparatus 
  occupying 
  

   somewhat 
  less 
  than 
  one-quarter 
  of 
  the 
  total 
  length 
  of 
  the 
  fish 
  ; 
  the 
  

   external 
  bones 
  ornamented 
  with 
  very 
  coarse 
  rounded 
  tubercles, 
  

   usually 
  fused 
  into 
  short 
  rugse, 
  which 
  are 
  directed 
  nearly 
  horizontally 
  

  

  l2 
  

  

  