﻿leptolepid^:. 
  525 
  

  

  37928. 
  Well-preserved 
  fish 
  0-08 
  in 
  length 
  ; 
  Solenhofen. 
  

  

  Haberlein 
  Coll. 
  

  

  P. 
  3680 
  c, 
  P. 
  3681, 
  P. 
  3685. 
  A 
  slightly 
  larger 
  specimen 
  and 
  two 
  

   smaller, 
  the 
  second 
  labelled 
  by 
  Miinster 
  " 
  Thrissops 
  sal- 
  

   moneus, 
  var. 
  brevis 
  " 
  ; 
  Kelheim. 
  Enniskillen 
  Coll. 
  

  

  P. 
  914. 
  Impression 
  of 
  fish 
  0*07 
  in 
  length 
  ; 
  Mornsheim. 
  

  

  Egerton 
  Coll. 
  

  

  37816-18. 
  Three 
  specimens 
  from 
  0-06 
  to 
  0-032 
  in 
  length 
  ; 
  Solen- 
  

   hofen. 
  Haberlein 
  Coll. 
  

  

  Thrissops 
  rochei, 
  Sauvage. 
  

  

  1893. 
  Thrissops 
  rochei, 
  H. 
  E. 
  Sauvage, 
  Bull. 
  Soc. 
  Hist. 
  Nat. 
  Autim, 
  

   vol. 
  vi. 
  p. 
  436, 
  pi. 
  viii. 
  fig. 
  2. 
  

  

  Type. 
  Nearly 
  complete 
  fish. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  048. 
  Length 
  of 
  head 
  with 
  

   opercular 
  apparatus 
  about 
  equal 
  to 
  the 
  maximum 
  depth 
  of 
  the 
  

   trunk, 
  and 
  contained 
  five 
  times 
  in 
  the 
  total 
  length 
  of 
  the 
  fish. 
  

   Vertebrae 
  about 
  60 
  in 
  number. 
  Pelvic 
  fins 
  arising 
  much 
  nearer 
  to 
  

   the 
  anal 
  than 
  to 
  the 
  pectorals; 
  dorsal 
  fin, 
  with 
  about 
  14 
  rays, 
  

   arising 
  opposite 
  the 
  origin 
  of 
  the 
  anal, 
  which 
  has 
  40 
  rays 
  ; 
  caudal 
  

   fin 
  less 
  deeply 
  forked 
  and 
  with 
  broader 
  lobes 
  than 
  in 
  the 
  type 
  

   species. 
  

  

  Form. 
  Sf 
  Loe. 
  Lower 
  Kimmeridgian 
  : 
  Orbagnoux, 
  Ain, 
  France. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Thrissops 
  portlandicus, 
  sp. 
  nov. 
  

   [Plate 
  XVIII. 
  fig. 
  4.] 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  British 
  Museum. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0*35, 
  perhaps 
  sometimes 
  

   larger. 
  Length 
  of 
  head 
  with 
  opercular 
  apparatus 
  somewhat 
  ex- 
  

   ceeding 
  the 
  maximum 
  depth 
  of 
  the 
  trunk 
  and 
  contained 
  five 
  times 
  

   in 
  the 
  total 
  length 
  of 
  the 
  fish. 
  Vertebras 
  at 
  least 
  60 
  in 
  number, 
  

   about 
  35 
  being 
  abdominal 
  and 
  25 
  caudal. 
  Pelvic 
  fins 
  arising 
  much 
  

   nearer 
  to 
  the 
  anal 
  than 
  to 
  the 
  pectorals 
  ; 
  dorsal 
  fin, 
  with 
  about 
  12 
  

   rays, 
  arising 
  opposite 
  the 
  origin 
  of 
  the 
  anal, 
  which 
  has 
  at 
  least 
  

   25 
  rays 
  ; 
  caudal 
  fin 
  very 
  deeply 
  forked 
  and 
  the 
  lobes 
  slender. 
  

  

  Form. 
  Sf 
  hoc. 
  Portlandian 
  : 
  Dorsetshire. 
  

  

  P. 
  5538. 
  The 
  type 
  specimen 
  in 
  counterpart, 
  one 
  side 
  shown 
  of 
  half 
  

   the 
  natural 
  size 
  in 
  PL 
  XVIII. 
  fig. 
  4; 
  Portland 
  Stone, 
  

   Isle 
  of 
  Portland. 
  The 
  head 
  is 
  very 
  imperfect, 
  the 
  jaws 
  

  

  