﻿PLATE 
  IY. 
  

  

  Fig. 
  Page 
  

  

  1. 
  Eugnatlius 
  orthostomus, 
  Agassiz 
  ; 
  head, 
  pectoral 
  fin, 
  and 
  

  

  scales, 
  left 
  lateral 
  aspect. 
  — 
  Lower 
  Lias 
  ; 
  Lyme 
  Regis. 
  

   ag. 
  Angular, 
  br. 
  Branchiostegal 
  rays. 
  c.o. 
  Circum- 
  

   orbitals. 
  d. 
  Dentary. 
  fr. 
  Prontals. 
  i.op. 
  Interopercu- 
  

   lum. 
  mx. 
  Maxilla, 
  op. 
  Operculum, 
  p.cl. 
  Postcla- 
  

   vicular 
  scales, 
  p.op. 
  Preoperculum. 
  p.t. 
  Post-temporal. 
  

   pa. 
  Parietal, 
  s.cl. 
  Supraclaviele. 
  s.moo. 
  Supramaxilla. 
  

   s.o. 
  Suborbitals 
  (postorbitals). 
  8. 
  op. 
  Suboperculum. 
  

   s.t. 
  Supratemporal. 
  sq. 
  Squamosal. 
  [P. 
  3633 
  b.J 
  293 
  

  

  2. 
  Eugnatlius 
  tenuidens, 
  Agassiz, 
  MS. 
  ; 
  left 
  maxilla, 
  outer 
  

  

  aspect. 
  — 
  Lower 
  Lias 
  ; 
  Street. 
  [P. 
  510.] 
  303 
  

  

  3. 
  Eugnatlius 
  minor, 
  Agassiz 
  ; 
  left 
  mandibular 
  ramus, 
  outer 
  

  

  aspect. 
  — 
  Lower 
  Lias 
  ; 
  Lyme 
  Regis. 
  [P. 
  3634 
  e.] 
  297 
  

  

  