﻿MACROSEHIID.E. 
  169 
  

  

  P. 
  1077. 
  Nearly 
  complete 
  trunk 
  wanting 
  the 
  head; 
  Kelheim. 
  The 
  

   dorsal 
  fin 
  is 
  especially 
  well 
  preserved, 
  and 
  the 
  squamation 
  

   of 
  the 
  left 
  side 
  is 
  shown 
  from 
  the 
  inner 
  aspect. 
  

  

  Egerton 
  Coll. 
  

  

  P. 
  3599. 
  Imperfect 
  caudal 
  region 
  figured 
  by 
  Agassiz, 
  he. 
  cit. 
  

   pi. 
  xxxviii. 
  fig. 
  3 
  : 
  Kelheim. 
  EnnisJcillen 
  Coll. 
  

  

  P. 
  3602. 
  Small 
  specimen 
  wanting 
  extremity 
  of 
  head 
  and 
  tail 
  ; 
  

   Kelheim. 
  EnnisJcillen 
  Coll. 
  

  

  Ophiopsis 
  guigardi, 
  Thiolliere. 
  

  

  1873. 
  Ophiopsis 
  guigardi, 
  V. 
  Thiolliere, 
  Poiss. 
  Foss. 
  Bugey, 
  pt. 
  ii. 
  

   pi. 
  vii. 
  (fig. 
  only). 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Lyons 
  Museum. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0*3. 
  Length 
  of 
  head 
  with 
  

   opercular 
  apparatus 
  equal 
  to 
  the 
  maximum 
  depth 
  of 
  the 
  trunk 
  and 
  

   contained 
  about 
  five-and-a-half 
  times 
  in 
  the 
  total 
  length 
  of 
  the 
  

   fish 
  ; 
  maximum 
  depth 
  of 
  trunk 
  twice 
  as 
  great 
  as 
  the 
  depth 
  of 
  the 
  

   caudal 
  pedicle. 
  Fin-fulcra 
  slender, 
  extending 
  up 
  the 
  anterior 
  ray 
  

   of 
  each 
  median 
  fin. 
  Dorsal 
  fin 
  less 
  than 
  half 
  as 
  long 
  as 
  the 
  back, 
  

   much 
  elevated 
  in 
  front, 
  arising 
  at 
  the 
  beginning 
  of 
  the 
  second 
  third 
  

   of 
  the 
  trunk. 
  Scales 
  relatively 
  large 
  and 
  smooth. 
  

  

  Form, 
  fy 
  Loc. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone) 
  : 
  Cirin, 
  

   Ain, 
  France. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Ophiopsis 
  penicillata, 
  Agassiz. 
  

  

  1844. 
  Ophiopsis 
  penicillatus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  

   p. 
  290, 
  pi. 
  xxxvi. 
  figs. 
  2-4. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  British 
  Museum. 
  

  

  A 
  robust 
  species 
  of 
  moderate 
  size. 
  Head 
  with 
  opercular 
  appa- 
  

   ratus 
  occupying 
  slightly 
  less 
  than 
  one-quarter 
  of 
  the 
  total 
  length 
  ; 
  

   maximum 
  depth 
  of 
  trunk 
  twice 
  as 
  great 
  as 
  the 
  width 
  of 
  the 
  caudal 
  

   pedicle 
  and 
  contained 
  five 
  times 
  in 
  the 
  total 
  length. 
  External 
  head- 
  

   bones 
  conspicuously 
  tuberculated 
  ; 
  teeth 
  long 
  and 
  slender. 
  Dorsal 
  

   fin 
  arising 
  at 
  the 
  end 
  of 
  the 
  anterior 
  third 
  of 
  the 
  back, 
  half 
  as 
  long 
  

   as 
  the 
  trunk, 
  comprising 
  not 
  less 
  than 
  25 
  rays, 
  mostly 
  bifurcated, 
  

   of 
  which 
  the 
  longest 
  do 
  not 
  equal 
  the 
  depth 
  of 
  the 
  trunk 
  at 
  their 
  

   point 
  of 
  insertion 
  ; 
  pelvic 
  fins 
  arising 
  slightly 
  in 
  advance 
  of 
  the 
  

   middle 
  point 
  between 
  the 
  pectorals 
  and 
  the 
  caudal. 
  

  

  The 
  scales 
  of 
  this 
  species 
  are 
  described 
  by 
  Agassiz 
  as 
  smooth 
  and 
  

  

  