﻿SEMIONOTID^). 
  149 
  

  

  •obtuse 
  and 
  slightly 
  bifid. 
  Scales 
  of 
  the 
  abdominal 
  and 
  part 
  of 
  the 
  

   caudal 
  region 
  all 
  ornamented 
  at 
  least 
  in 
  their 
  anterior 
  half 
  with 
  

   coarse 
  tuberculations, 
  which 
  are 
  often 
  flattened, 
  closely 
  arranged, 
  

   and 
  in 
  part 
  fused 
  into 
  rugae 
  ; 
  hinder 
  border 
  conspicuously 
  serrated 
  

   in 
  young 
  specimens, 
  smooth 
  or 
  nearly 
  so 
  in 
  adults. 
  

  

  The 
  type 
  specimen 
  of 
  the 
  so-called 
  D. 
  cycloides 
  was 
  obtained 
  

   from 
  the 
  " 
  Angulatus-kalk 
  " 
  of 
  Steinburg, 
  near 
  Zabern, 
  Lower 
  

   Alsace. 
  

  

  Form. 
  Sf 
  Log. 
  Lower 
  Lias 
  : 
  Dorsetshire 
  and 
  Alsace-Lorraine. 
  

  

  All 
  the 
  following 
  specimens 
  were 
  obtained 
  from 
  the 
  neighbour- 
  

   hood 
  of 
  Lyme 
  Regis, 
  Dorsetshire 
  : 
  — 
  

  

  P. 
  3561. 
  Type 
  specimen 
  of 
  the 
  so-called 
  Tetragonolejpis 
  pustulatus, 
  

   described 
  and 
  figured 
  by 
  Agassiz, 
  loc. 
  cit. 
  Eemains 
  of 
  

   the 
  head 
  and 
  anterior 
  abdominal 
  squamation 
  are 
  shown, 
  

   but 
  teeth 
  are 
  wanting. 
  EnnisTcillen 
  Coll. 
  

  

  19004 
  a. 
  Eemains 
  of 
  the 
  head 
  and 
  greater 
  portion 
  of 
  the 
  trunk 
  of 
  

   a 
  large 
  fish 
  probably 
  about 
  0*6 
  in 
  length. 
  From 
  the 
  

   Johnson 
  Collection, 
  noticed 
  by 
  Agassiz, 
  op. 
  cit. 
  vol. 
  ii. 
  

   pt. 
  i. 
  p. 
  201. 
  Purchased, 
  1845. 
  

  

  40351. 
  Large 
  specimen, 
  much 
  elongated 
  by 
  distortion 
  and 
  dis- 
  

   playing 
  the 
  caudal 
  fin. 
  Purchased, 
  1867. 
  

  

  P. 
  5937. 
  Fine 
  specimen 
  0*55 
  in 
  length, 
  showing 
  the 
  obtuse, 
  bifid 
  

   marginal 
  teeth. 
  The 
  scales 
  are 
  not 
  serrated, 
  and 
  many 
  

   of 
  the 
  tubercles 
  on 
  the 
  flank 
  are 
  fused 
  into 
  short 
  rugae. 
  

  

  Purchased, 
  1889. 
  

  

  P. 
  3563. 
  Well-preserved 
  fish 
  about 
  0-475 
  in 
  length. 
  As 
  in 
  the 
  

   former 
  specimen, 
  none 
  of 
  the 
  scales 
  exhibit 
  serrations. 
  

  

  Enniskillen 
  Coll. 
  

  

  P. 
  3564. 
  An 
  equally 
  large 
  imperfect 
  fish 
  displaying 
  the 
  dorsal 
  and 
  

   caudal 
  fins. 
  The 
  tuberculations 
  upon 
  the 
  cranial 
  roof 
  

   and 
  flank-scales 
  are 
  partially 
  fused 
  into 
  short 
  rugae. 
  

  

  Enniskillen 
  Coll. 
  

  

  P. 
  3564 
  a. 
  Imperfect 
  head 
  and 
  trunk 
  wanting 
  the 
  dorsal 
  region 
  ; 
  

   the 
  ornament 
  consisting 
  of 
  rounded 
  tubercles, 
  rarely 
  fused 
  

   except 
  on 
  the 
  ridge-scales. 
  Enniskillen 
  Coll. 
  

  

  P. 
  3562. 
  Imperfect 
  and 
  distorted 
  remains 
  of 
  the 
  head 
  and 
  abdominal 
  

   region 
  of 
  an 
  equally 
  large 
  fish. 
  Enniskillen 
  Coll. 
  

  

  P. 
  3564 
  b. 
  Fragmentary 
  trunk 
  with 
  skull. 
  EnnisTcillen 
  Coll. 
  

  

  P. 
  1577. 
  Fine 
  specimen 
  0*42 
  in 
  length. 
  Egerton 
  Coll. 
  

  

  