﻿294 
  - 
  ACTINOPTERYGII. 
  

  

  Eugnathus 
  philpotse, 
  Agassiz. 
  

   [Plate 
  V. 
  fig. 
  2.] 
  

  

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

  

  p. 
  101, 
  pi. 
  lviii. 
  

   1839-44. 
  Eugnathus 
  polyodon, 
  L. 
  Agassiz, 
  ibid. 
  p. 
  104, 
  pi. 
  lviii 
  a. 
  fig. 
  2. 
  

  

  [Imperfect 
  head 
  ; 
  Oxford 
  Museum.] 
  

   1844. 
  Eugnathus 
  opercularis, 
  L. 
  Agassiz, 
  ibid. 
  p. 
  104. 
  [Fish 
  ; 
  un- 
  

   known.] 
  

   1868. 
  Eulepidotus 
  sauroides, 
  Sir 
  P. 
  Egerton, 
  Quart. 
  Jo 
  urn. 
  Geol. 
  Soc. 
  

  

  vol. 
  xxiv. 
  p. 
  503. 
  [Nearly 
  complete 
  fish 
  ; 
  British 
  Museum.] 
  

   1872. 
  Heterolepidotus 
  sauroides, 
  Sir 
  P. 
  Egerton, 
  Figs. 
  & 
  Descript. 
  Brit. 
  

  

  Organic 
  Remains, 
  dec. 
  xiii. 
  (Mem. 
  Geol. 
  Surv.), 
  no. 
  3, 
  pi. 
  iii. 
  

   1887. 
  Ophiopsis 
  sauroides, 
  K. 
  A. 
  von 
  Zittel, 
  Handb. 
  Palssont. 
  vol. 
  iii. 
  

  

  p. 
  217. 
  

   1890. 
  Eugnathus 
  philpotce, 
  Woodward 
  & 
  Sherborn, 
  Catal. 
  Brit. 
  Foss. 
  

  

  Vertebrata, 
  p. 
  79. 
  

  

  Type. 
  Fish, 
  wanting 
  jaws 
  ; 
  Oxford 
  Museum. 
  

  

  A 
  larger 
  species 
  than 
  the 
  type, 
  attaining 
  a 
  length 
  of 
  about 
  0'7, 
  

   and 
  with 
  a 
  relatively 
  deeper, 
  dorsally-arched 
  abdominal 
  region. 
  

   Length 
  of 
  head 
  with 
  opercular 
  apparatus 
  not 
  exceeding 
  the 
  

   maximum 
  depth 
  of 
  the 
  trunk, 
  and 
  contained 
  nearly 
  five 
  times 
  in 
  

   the 
  total 
  length 
  of 
  the 
  fish. 
  Head 
  short 
  and 
  broad, 
  the 
  roof 
  of 
  the 
  

   skull 
  being 
  less 
  than 
  twice 
  as 
  long 
  as 
  its 
  width 
  at 
  the 
  occiput, 
  and 
  

   all 
  the 
  external 
  bones 
  smooth 
  or 
  with 
  few 
  small 
  tuberculations 
  ; 
  

   maxillary 
  teeth 
  numerous 
  and 
  slender, 
  those 
  of 
  the 
  premaxilla 
  and 
  

   dentary 
  much 
  larger, 
  fewer, 
  and 
  more 
  robust, 
  but 
  attenuated 
  to 
  a 
  

   slender, 
  more 
  or 
  less 
  curved 
  point 
  ; 
  splenial 
  teeth 
  small 
  ; 
  operculum 
  

   as 
  broad 
  as 
  deep. 
  Fins 
  as 
  in 
  the 
  type 
  species, 
  but 
  the 
  anal 
  

   apparently 
  somewhat 
  more 
  remote. 
  Scales 
  relatively 
  larger 
  than 
  

   in 
  the 
  type 
  species, 
  usually 
  less 
  conspicuously 
  ornamented, 
  otherwise 
  

   similar. 
  

  

  Some 
  specimens 
  (e. 
  g. 
  no. 
  P. 
  2021) 
  prove 
  that 
  in 
  this 
  species 
  

   there 
  are 
  ossifications 
  in 
  the 
  sheath 
  of 
  the 
  notochord. 
  

  

  Form. 
  Sf 
  Loc. 
  Lower 
  Lias 
  : 
  Dorsetshire. 
  

  

  All 
  the 
  following 
  specimens 
  were 
  obtained 
  from 
  the 
  neighbour- 
  

   hood 
  of 
  Lyme 
  Regis 
  : 
  — 
  

  

  P. 
  3577. 
  A 
  fine 
  specimen, 
  nearly 
  complete, 
  about 
  0*7 
  in 
  length. 
  

   The 
  long 
  slender 
  mandibular 
  teeth 
  are 
  conspicuous. 
  

  

  Enniskillen 
  Coll. 
  

  

  P. 
  3576. 
  An 
  equally 
  large 
  fish, 
  more 
  fractured 
  and 
  somewhat 
  

  

  