﻿PACHYCORMIDiE. 
  385 
  

  

  P. 
  3705 
  a, 
  b, 
  e, 
  P. 
  3710c. 
  Four 
  similar 
  specimens; 
  Whitby. 
  

  

  Enniskillen 
  Coll. 
  

  

  P. 
  884 
  f, 
  P. 
  3703. 
  Another 
  head, 
  in 
  counterpart 
  ; 
  Whitby. 
  

  

  Egerton 
  Sf 
  Enniskillen 
  Colls. 
  

  

  P. 
  3705 
  d. 
  Portion 
  of 
  opercular 
  apparatus 
  and 
  anterior 
  squamation 
  ; 
  

   Whitby. 
  Enniskillen 
  Coll. 
  

  

  Pachycormus 
  curtus, 
  Agassiz. 
  

  

  1832. 
  Urceus 
  gracilis, 
  L. 
  Agassiz, 
  Neues 
  Jahrb. 
  p. 
  142. 
  

  

  1833-44. 
  Pachycormus 
  gracilis, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  

  

  p. 
  12; 
  pt. 
  ii. 
  p. 
  114 
  (undefined). 
  

   1844. 
  Pachycormus 
  curtus, 
  L. 
  Agassiz, 
  ibid. 
  pt. 
  ii. 
  p. 
  112, 
  pi. 
  lix. 
  

   1844. 
  Pachycormus 
  latus, 
  L. 
  Agassiz, 
  ibid. 
  pt. 
  ii. 
  p. 
  114. 
  [Portion 
  of 
  

  

  fish 
  ; 
  British 
  Museum.] 
  

   1843. 
  Pachycormus 
  curtus, 
  F. 
  A. 
  Quenstedt, 
  Flozgeb. 
  Wiirttemb. 
  p. 
  244. 
  

   1858. 
  Pachycormus 
  curtus, 
  F. 
  A. 
  Quenstedt, 
  Der 
  Jura, 
  p. 
  235, 
  pi. 
  xxxii. 
  

  

  fig. 
  4. 
  ' 
  

   1860. 
  Pachycormus 
  curtus, 
  A. 
  Wagner, 
  Gelehrte 
  Anzeig. 
  k. 
  bay. 
  Akad. 
  

  

  Wiss. 
  vol. 
  1. 
  p. 
  225. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  British 
  Museum. 
  

  

  A 
  stout 
  species 
  of 
  moderate 
  size, 
  attaining 
  a 
  length 
  of 
  about 
  0*5. 
  

   Head 
  much 
  shorter 
  than 
  in 
  the 
  type 
  species, 
  and 
  this 
  with 
  the 
  oper- 
  

   cular 
  apparatus 
  occupying 
  more 
  than 
  one-quarter 
  of 
  the 
  total 
  length 
  of 
  

   the 
  fish; 
  operculum 
  triangular, 
  deeper 
  than 
  broad, 
  and 
  branchiostegal 
  

   rays 
  about 
  40 
  in 
  number. 
  Scales 
  of 
  moderate 
  size 
  and 
  smooth. 
  

  

  Variously 
  crushed 
  examples 
  of 
  Pachycormus 
  from 
  the 
  Upper 
  Lias 
  

   of 
  the 
  Dept. 
  Yonne, 
  France, 
  not 
  yet 
  clearly 
  denned 
  and 
  distinguished 
  

   from 
  P. 
  curtus, 
  have 
  received 
  the 
  names 
  of 
  Caturus 
  stenospondylus 
  

   (H. 
  E. 
  Sauvage, 
  Bibl. 
  Ecole 
  Hautes 
  Etudes, 
  vol. 
  xiv. 
  1875, 
  no. 
  1. 
  

   p. 
  13, 
  pi. 
  iii. 
  ; 
  Bull. 
  Soc. 
  Sci. 
  Ycnne, 
  [3] 
  vol. 
  vii. 
  1883, 
  p. 
  41 
  ; 
  and 
  

   Bull. 
  Soc. 
  Hist. 
  Nat. 
  Autun, 
  vol. 
  iv. 
  1891, 
  p. 
  75) 
  ; 
  Caturus 
  stenoura 
  

   (H. 
  E. 
  Sauvage, 
  loc. 
  cit. 
  1875, 
  p. 
  18, 
  pi. 
  i. 
  fig. 
  2 
  ; 
  loc. 
  cit. 
  1883, 
  p. 
  46, 
  

   pi. 
  ii. 
  fig. 
  2; 
  and 
  loc. 
  cit. 
  1891, 
  pp. 
  78, 
  81, 
  pi. 
  viii.) 
  ; 
  and 
  Caturus 
  

   chajperi 
  (H. 
  E. 
  Sauvage, 
  loc. 
  cit. 
  1883, 
  p. 
  43, 
  pi. 
  ii. 
  fig. 
  1 
  ; 
  and 
  loc. 
  

   cit. 
  1891, 
  p. 
  76, 
  pi. 
  vi.). 
  Another 
  fish 
  from 
  the 
  Upper 
  Lias 
  of 
  

   Werther, 
  Ravensberg, 
  Westphalia, 
  also 
  not 
  clearly 
  distinguished 
  from 
  

   P. 
  curtus 
  (and 
  thus 
  provisionally 
  determined 
  by 
  F. 
  A.Roemer,Verstein. 
  

   norddeutsch. 
  Oolithen-geb., 
  Nachtr. 
  1839, 
  p. 
  53), 
  is 
  named 
  P. 
  crassus 
  

   (A. 
  Wagner, 
  Gelehrte 
  Anzeig. 
  k. 
  bay. 
  Akad. 
  Wiss. 
  vol. 
  1. 
  I860, 
  

   p. 
  226). 
  Here 
  also 
  may 
  perhaps 
  be 
  placed 
  the 
  undefined 
  Caturus 
  

   meyeri 
  (L. 
  Agassiz, 
  ex 
  Minister 
  MS., 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  1844, 
  

   p. 
  118) 
  from 
  Werther. 
  

  

  Form. 
  § 
  Loc. 
  Upper 
  Lias 
  : 
  Yorkshire, 
  Gloucestershire, 
  and 
  

   Somersetshire 
  ; 
  N. 
  France 
  ; 
  Wiirtemberg. 
  

  

  part 
  in. 
  2 
  c 
  

  

  