﻿388 
  ACTINOPTERYGII. 
  

  

  32435. 
  Small 
  head 
  and 
  left 
  pectoral 
  fin, 
  this 
  displaying 
  three 
  basal 
  

   fulcra 
  and 
  a 
  close 
  series 
  of 
  minute 
  fulcra 
  beyond 
  ; 
  Curcy. 
  

  

  Tesson 
  Coll. 
  

  

  32432, 
  32434. 
  Two 
  small 
  heads, 
  the 
  first 
  displaying 
  the 
  branchio- 
  

   stegal 
  rays, 
  the 
  second 
  exhibiting 
  the 
  cranium 
  and 
  cheek- 
  

   plates; 
  Curcy. 
  Tesson 
  Coll. 
  

  

  32437-39, 
  39 
  a. 
  Four 
  fragmentary 
  heads 
  with 
  anterior 
  scales, 
  those 
  

   of 
  the 
  last 
  specimen 
  faintly 
  rugose 
  ; 
  Curcy. 
  Tesson 
  Coll. 
  

  

  35583. 
  Eemains 
  of 
  head 
  and 
  trunk 
  either 
  of 
  this 
  species 
  or 
  P. 
  acuti- 
  

   rostris 
  ; 
  Whitby. 
  Purchased, 
  1859. 
  

  

  Pachycormus 
  ( 
  Saur 
  ostomus 
  ) 
  esocinus 
  (Agassiz). 
  

   1833-44. 
  Saurostomus 
  esocinus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  

  

  p. 
  14 
  ; 
  pt. 
  ii. 
  p. 
  144, 
  pi. 
  lviii. 
  b. 
  fig. 
  4. 
  

   1844. 
  Eugnathus 
  giganteus= 
  Pachycormus 
  giganteus, 
  L. 
  Agassiz, 
  ibid. 
  

  

  pt. 
  ii. 
  pp. 
  104, 
  114 
  (undefined). 
  [Imperfect 
  fish 
  ; 
  British 
  Museum.] 
  

   1844. 
  Pachycormus 
  latirostris, 
  L. 
  Agassiz, 
  ibid. 
  pt. 
  ii. 
  p. 
  114. 
  [Imper- 
  

   fect 
  head 
  ; 
  British 
  Museum.] 
  

   1848. 
  Pachycormus 
  esocinus, 
  C. 
  G. 
  Giebel, 
  Fauna 
  d. 
  Vorw., 
  Fische, 
  

  

  p. 
  197. 
  

   1848. 
  Pachycormus 
  latirostris, 
  C. 
  G. 
  Giebel, 
  ibid. 
  p. 
  198. 
  

   1848. 
  Eugnathus 
  giganteus, 
  C. 
  G. 
  Giebel, 
  ibid. 
  p. 
  238. 
  

   1858. 
  Pachycormus 
  bollensis, 
  F. 
  A. 
  Quenstedt, 
  Der 
  Jura, 
  p. 
  237, 
  pi. 
  xxxii. 
  

  

  fig. 
  6. 
  [Imperfect 
  fish 
  ; 
  Tiibingen 
  University 
  Museum.] 
  

   (?) 
  1878. 
  Pachycormus 
  xoestermam, 
  T. 
  C. 
  Winkler, 
  Archiv. 
  Mus. 
  Teyler, 
  

  

  vol. 
  v. 
  p. 
  9, 
  pi. 
  i. 
  [Imperfect 
  fish; 
  Teyler 
  Museum, 
  Haarlem.] 
  

   1891. 
  Caturus 
  gigas, 
  H. 
  E. 
  Sauvage, 
  Bull. 
  Soc. 
  Hist. 
  Nat. 
  Autun, 
  

  

  vol. 
  iv. 
  p. 
  74, 
  pi. 
  vii. 
  [Head.] 
  

  

  Type. 
  Dentary 
  bone 
  ; 
  olim 
  Walchner 
  Coll. 
  

  

  A 
  large 
  species, 
  attaining 
  a 
  length 
  of 
  not 
  less 
  than 
  1-0. 
  Head 
  

   with 
  opercular 
  apparatus 
  occupying 
  one-quarter 
  of 
  the 
  total 
  length 
  

   of 
  the 
  fish 
  ; 
  head 
  very 
  short 
  and 
  stout, 
  and 
  teeth 
  relatively 
  larger 
  

   than 
  in 
  the 
  other 
  species 
  ; 
  operculum 
  as 
  broad 
  as 
  deep, 
  trapezoidal 
  

   in 
  form, 
  and 
  the 
  upper 
  border 
  shortest 
  ; 
  branchiostegal 
  rays 
  some- 
  

   what 
  less 
  than 
  40 
  in 
  number. 
  Dorsal 
  and 
  anal 
  fins 
  about 
  equally 
  

   extended, 
  with 
  not 
  less 
  than 
  30 
  rays, 
  the 
  latter 
  arising 
  just 
  in 
  

   advance 
  of 
  a 
  point 
  opposite 
  the 
  hinder 
  end 
  of 
  the 
  former. 
  Scales 
  

   of 
  the 
  lateral 
  line 
  on 
  the 
  caudal 
  region 
  somewhat 
  enlarged. 
  

  

  This 
  is 
  the 
  type 
  species 
  of 
  the 
  so-called 
  genus 
  Saurostomus, 
  and 
  

   further 
  researches 
  must 
  determine 
  definitely 
  whether 
  or 
  not 
  its 
  

   universally-accepted 
  reference 
  to 
  Pachycormus 
  is 
  correct. 
  The 
  

   characteristic 
  median 
  elevation 
  of 
  the 
  parieto-occipital 
  region 
  of 
  the 
  

  

  