﻿PLATE 
  IX. 
  

  

  Pig. 
  Page 
  

  

  1. 
  Caturus 
  heterurus 
  (Agassiz) 
  ; 
  anterior 
  half 
  of 
  fish, 
  left 
  

  

  lateral 
  aspect, 
  one-half 
  nat. 
  size. 
  — 
  Lower 
  Lias; 
  Lyme 
  

   Eegis. 
  br. 
  Branchiostegal 
  rays. 
  d. 
  Dentary. 
  g. 
  Gular 
  

   plate, 
  mx. 
  Maxilla, 
  op. 
  Operculum, 
  p.o. 
  Suborbital 
  

   (postorbital). 
  p.op. 
  Preoperculum. 
  p.t. 
  Post-temporal. 
  

   pmcc. 
  Premaxilla. 
  s.mcc. 
  Supramaxilla. 
  s.op. 
  Sub- 
  

   operculum. 
  [38121.] 
  340 
  

  

  2. 
  Ditto 
  ; 
  upper 
  caudal 
  lobe, 
  left 
  lateral 
  aspect. 
  — 
  Ibid. 
  

  

  /. 
  Eulcral 
  ridge-scales, 
  r. 
  Caudal 
  fin-rays. 
  s. 
  Ehombic 
  

   scales. 
  [P. 
  2036.] 
  341 
  

  

  3. 
  Ditto 
  ; 
  pelvic 
  fin-support.— 
  Ibid. 
  [P. 
  2036.] 
  341 
  

  

  4. 
  Ditto 
  ; 
  caudal 
  flank-scales, 
  twice 
  nat. 
  size. 
  — 
  Ibid. 
  

  

  [P. 
  2036.] 
  341 
  

  

  