﻿296 
  ACTINOPTEKYGII. 
  

  

  P. 
  4233. 
  Vertically 
  crushed 
  head, 
  pectoral 
  fins, 
  and 
  some 
  anterior 
  

   scales, 
  seen 
  from 
  above. 
  The 
  supratemporals 
  are 
  finely 
  

   tuberculated. 
  EnnisJcillen 
  Coll. 
  

  

  19483. 
  Imperfect 
  fish 
  about 
  0*47 
  in 
  length, 
  vertically 
  crushed, 
  

   displaying 
  some 
  of 
  the 
  slender 
  neural 
  spines 
  and 
  ribs 
  of 
  

   the 
  axial 
  skeleton, 
  and 
  the 
  biserial 
  fulcra 
  on 
  the 
  dorsal 
  fin. 
  

  

  Purchased, 
  1845. 
  

  

  P. 
  3634 
  a, 
  b, 
  P. 
  3641. 
  Two 
  equally 
  large 
  imperfect 
  specimens, 
  and 
  

   one 
  smaller 
  individual 
  showing 
  head 
  from 
  the 
  infero- 
  

   lateral 
  aspect. 
  EnnisJcillen 
  Coll. 
  

  

  P. 
  3634 
  c, 
  d. 
  Imperfect 
  fish 
  about 
  0-43 
  in 
  length, 
  and 
  a 
  smaller 
  

   distorted 
  specimen. 
  EnnisJcillen 
  Coll. 
  

  

  38122. 
  Small 
  specimen 
  about 
  0*32 
  in 
  length, 
  much 
  crushed 
  and 
  

   imperfect. 
  Purchased, 
  1864. 
  

  

  P. 
  2035, 
  P. 
  3638 
  a. 
  Two 
  small 
  specimens 
  vertically 
  crushed 
  and 
  

   shown 
  from 
  the 
  ventral 
  aspect. 
  

  

  Egerton 
  Sf 
  EnnisJcillen 
  Colls. 
  

  

  P. 
  3634 
  g. 
  Remains 
  of 
  small 
  head, 
  pectoral 
  fin, 
  and 
  scales, 
  probably 
  

   of 
  this 
  species. 
  EnnisJcillen 
  Coll. 
  

  

  Eugnathus 
  minor, 
  Agassiz. 
  

  

  [Plate 
  IV. 
  fig. 
  3 
  ; 
  Plate 
  V. 
  fig. 
  3 
  ; 
  Plate 
  VI. 
  fig. 
  1.] 
  

  

  1839. 
  Eugnathus 
  minor, 
  L. 
  Agassiz, 
  Neues 
  Jahrb. 
  p. 
  118. 
  

   1839-44. 
  Eugnathus 
  minor, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  ii. 
  

   p. 
  103, 
  pi. 
  lviiia. 
  fig. 
  1. 
  

  

  Type. 
  Portion 
  of 
  head 
  and 
  trunk 
  ; 
  Oxford 
  Museum. 
  

  

  A 
  species 
  of 
  moderate 
  size, 
  attaining 
  a 
  length 
  of 
  about 
  0*35. 
  

   Length 
  of 
  head 
  with 
  opercular 
  apparatus 
  not 
  much 
  exceeding 
  the 
  

   maximum 
  depth 
  of 
  the 
  trunk, 
  and 
  contained 
  somewhat 
  less 
  than 
  

   four 
  times 
  in 
  the 
  total 
  length 
  of 
  the 
  fish. 
  Head 
  comparatively 
  

   broad, 
  the 
  width 
  of 
  the 
  roof 
  of 
  the 
  skull 
  at 
  the 
  occiput 
  equalling 
  

   about 
  one-half 
  of 
  its 
  length 
  ; 
  external 
  bones 
  smooth 
  or 
  with 
  few 
  

   small 
  tuberculations 
  ; 
  maxillary 
  teeth 
  small, 
  slender 
  behind 
  and 
  

   stouter 
  in 
  front 
  ; 
  premaxillary 
  teeth 
  larger 
  and 
  robust 
  ; 
  dentary 
  

   teeth 
  stout 
  and 
  well-spaced, 
  relatively 
  smaller 
  and 
  more 
  numerous 
  

   than 
  in 
  the 
  type 
  species, 
  and 
  splenial 
  teeth 
  small 
  ; 
  operculum 
  

   considerably 
  deeper 
  than 
  broad. 
  Pins 
  and 
  squamation 
  as 
  in 
  the 
  

   type 
  species. 
  

  

  Form. 
  Sf 
  hoc. 
  Lower 
  Lias 
  : 
  Dorsetshire. 
  

  

  