﻿494 
  ACTINOPTERYGII. 
  

  

  figs. 
  2, 
  3, 
  pi. 
  xxix. 
  fig. 
  1. 
  The 
  drawing 
  given 
  by 
  Agassiz 
  

   is 
  very 
  unsatisfactory, 
  and 
  the 
  remarkable 
  bony 
  gill- 
  

   rakers, 
  with 
  the 
  compound 
  first 
  vertebra 
  and 
  the 
  anterior 
  

   portion 
  of 
  the 
  right 
  dentary, 
  are 
  re-figured 
  by 
  the 
  present 
  

   writer. 
  The 
  large 
  and 
  broad 
  ascending 
  process 
  of 
  the 
  

   dentary 
  behind 
  its 
  tooth-bearing 
  margin 
  is 
  well 
  seen 
  ; 
  

   and 
  the 
  ceratohyal 
  supports 
  slender, 
  widely-spaced 
  bran- 
  

   chiostegal 
  rays. 
  Enniskillen 
  Coll. 
  

  

  21974. 
  Imperfect 
  cranium 
  and 
  chain 
  of 
  thirteen 
  anterior 
  vertebrae, 
  

   exposed 
  from 
  the 
  left 
  side. 
  The 
  first 
  vertebral 
  centrum, 
  

   as 
  in 
  the 
  previous 
  specimen, 
  appears 
  to 
  consist 
  of 
  two 
  

   fused 
  discs, 
  the 
  hinder 
  alone 
  bearing 
  the 
  rib-facette. 
  

  

  Purchased, 
  1848. 
  

  

  36083. 
  Left 
  dentary 
  bone 
  as 
  large 
  as 
  that 
  of 
  the 
  type 
  specimen 
  of 
  

   0. 
  vectensis, 
  shown 
  from 
  the 
  outer 
  aspect. 
  The 
  depth 
  at 
  

   the 
  symphysis 
  seems 
  to 
  be 
  about 
  the 
  same 
  in 
  the 
  two 
  

   specimens, 
  but 
  the 
  distance 
  from 
  the 
  symphysis 
  to 
  the 
  

   hinder 
  margin 
  of 
  the 
  ascending 
  process 
  is 
  much 
  the 
  least 
  

   in 
  the 
  present 
  fossil. 
  Cunnington 
  Coll. 
  

  

  P. 
  1121. 
  Fragment 
  of 
  small 
  vertebral 
  column, 
  described 
  and 
  partly 
  

   figured 
  by 
  the 
  present 
  writer, 
  loc. 
  cit. 
  p. 
  349, 
  pi. 
  xxviii. 
  

   fig. 
  4. 
  Egerton 
  Coll. 
  

  

  23407, 
  36082. 
  Two 
  portions 
  of 
  much 
  larger 
  vertebral 
  column. 
  

  

  Purchased, 
  1849, 
  and 
  Cunnington 
  Coll. 
  

  

  50090. 
  Anterior 
  portion 
  of 
  very 
  large 
  vertebral 
  column, 
  and 
  some 
  

   head-fragments. 
  Purchased, 
  1879. 
  

  

  24816. 
  Detached 
  vertebral 
  centrum 
  pierced 
  by 
  a 
  mesial 
  foramen 
  

   for 
  the 
  passage 
  of 
  a 
  remnant 
  of 
  the 
  notochord. 
  

  

  Cunnington 
  Coll. 
  

  

  OEOPJOSCOPUS, 
  Costa. 
  

   [Ittiol. 
  Foss. 
  Ital. 
  1853, 
  p. 
  2 
  (Ionoscopus).'] 
  

  

  Syn. 
  Attakeopsis, 
  V. 
  Thiolliere, 
  Bull. 
  Soc. 
  G6ol. 
  France, 
  [2] 
  vol. 
  xv. 
  

   1858, 
  p. 
  784 
  (name 
  only), 
  and 
  Poiss. 
  Foss. 
  Bugey, 
  pt. 
  ii. 
  

   1873, 
  p. 
  22. 
  

   Macrorhipis, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  math.-phys. 
  

   CI. 
  vol. 
  ix. 
  1863, 
  p. 
  723. 
  

  

  Head 
  large 
  and 
  snout 
  pointed 
  ; 
  maxilla 
  much 
  deepened 
  behind, 
  

   with 
  nearly 
  straight 
  dentigerous 
  border; 
  teeth 
  of 
  moderate 
  size, 
  

   stout 
  and 
  conical 
  or 
  styliform. 
  Vertebral 
  centra 
  usually 
  about 
  as 
  

  

  