﻿524 
  ACTINOPTERYGII. 
  

  

  three-and-a-half 
  and 
  four 
  times 
  in 
  the 
  length 
  of 
  the 
  trunk 
  from 
  the 
  

   pectoral 
  arch 
  to 
  the 
  base 
  of 
  the 
  caudal 
  fin. 
  Vertebrae 
  and 
  fins 
  as 
  

   in 
  T. 
  salmoneus. 
  

  

  Form. 
  Sf 
  Log. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone) 
  : 
  Ba- 
  

   varia, 
  and 
  (?) 
  Ain, 
  France. 
  

  

  37819. 
  Large 
  much-fractured 
  specimen 
  0*25 
  in 
  length 
  ; 
  Solenhofen. 
  

   The 
  number 
  of 
  vertebras 
  between 
  the 
  occiput 
  and 
  the 
  

   hinder 
  border 
  of 
  the 
  operculum 
  is 
  shown 
  to 
  be 
  six. 
  

  

  Haberlein 
  Coll. 
  

  

  P. 
  3680. 
  Less 
  imperfect 
  specimen 
  0-203 
  in 
  length 
  ; 
  Kelheim. 
  

  

  Ennishillen 
  Coll. 
  

  

  37828. 
  Somewhat 
  smaller 
  fish, 
  in 
  counterpart 
  ; 
  Solenhofen. 
  

  

  Haberlein 
  Coll. 
  

  

  P. 
  917 
  a. 
  Fine 
  specimen 
  0*175 
  in 
  length, 
  labelled 
  Thrissops 
  propin- 
  

   quus 
  by 
  Miinster 
  ; 
  Kelheim. 
  Egerton 
  Coll. 
  

  

  P. 
  916. 
  Another 
  fine 
  specimen 
  nearly 
  as 
  large 
  as 
  the 
  last, 
  showing 
  

   an 
  undigested 
  fish 
  (apparently 
  Leptolepis) 
  in 
  the 
  abdomen 
  ; 
  

   Solenhofen. 
  Egerton 
  Coll. 
  

  

  P. 
  3680 
  a, 
  b. 
  Similar 
  but 
  contorted 
  specimen, 
  and 
  a 
  smaller 
  fish 
  ; 
  

   Kelheim. 
  Ennishillen 
  Coll. 
  

  

  P. 
  915. 
  Four 
  smaller 
  specimens 
  ; 
  Kelheim. 
  Egerton 
  Coll. 
  

  

  P. 
  918, 
  P. 
  921. 
  Three 
  imperfect 
  specimens 
  of 
  the 
  fish 
  named 
  

   Thrissops 
  regleyi 
  by 
  Thiolliere, 
  probably 
  referable 
  to 
  this 
  

   species 
  ; 
  Cirin, 
  Ain, 
  France. 
  Egerton 
  Coll. 
  

  

  P. 
  4688. 
  Similar 
  fish 
  0-145 
  in 
  length, 
  preserved 
  chiefly 
  as 
  an 
  

   impression; 
  Cirin. 
  Purchased, 
  1884. 
  

  

  P. 
  4689. 
  Imperfect 
  contorted 
  specimen, 
  in 
  counterpart 
  ; 
  Cirin. 
  

  

  Purchased, 
  1884. 
  

  

  The 
  following 
  small 
  specimens 
  are 
  doubtless 
  to 
  be 
  regarded 
  as 
  

   immature 
  individuals 
  of 
  some 
  or 
  all 
  of 
  the 
  three 
  foregoing 
  species. 
  

   The 
  head 
  with 
  opercular 
  apparatus 
  occupies 
  somewhat 
  more 
  than 
  

   one-fifth 
  of 
  the 
  total 
  length 
  of 
  the 
  fish, 
  and 
  similar 
  specimens 
  have 
  

   received 
  the 
  names 
  of 
  Thrissops 
  cephalus 
  (Agassiz, 
  Poiss. 
  Foss. 
  

   vol. 
  ii. 
  pt. 
  ii. 
  1844, 
  p. 
  125, 
  pi. 
  lxi. 
  figs. 
  1-3 
  : 
  Palaeontological 
  

   Museum, 
  Munich) 
  and 
  Thrissops 
  micrurus 
  (Winkler,. 
  JSTatuurk. 
  

   Yerhandl. 
  Holland. 
  Maatsch. 
  [2] 
  vol. 
  xiv. 
  1861, 
  p. 
  14, 
  fig. 
  2: 
  

   Teyler 
  Museum, 
  Haarlem). 
  

  

  