﻿16 
  ACTINOPTEKYGII. 
  

  

  P. 
  935 
  a. 
  Much 
  crushed 
  and 
  fractured 
  small 
  head, 
  lateral 
  aspect. 
  

  

  Egerton 
  Coll. 
  

  

  P. 
  4271. 
  Similar 
  specimen. 
  EnnisTcillen 
  Coll. 
  

  

  47462. 
  Imperfect 
  remains 
  of 
  head, 
  displaying 
  the 
  parasphenoid 
  

   bone 
  in 
  side 
  view, 
  and 
  one 
  of 
  the 
  suborbital 
  plates. 
  In 
  

   its 
  posterior 
  portion 
  the 
  parasphenoid 
  exhibits 
  a 
  large 
  

   ascending 
  lateral 
  plate. 
  Purchased, 
  1876. 
  

  

  48007. 
  Imperfect 
  cranium 
  in 
  side 
  view, 
  showing 
  the 
  orbit, 
  narial 
  

   opening, 
  and 
  the 
  dentition 
  with 
  the 
  notches 
  for 
  the 
  

   reception 
  of 
  the 
  lower 
  laniaries. 
  Purchased, 
  1887. 
  

  

  40499. 
  Small 
  cranium, 
  upper 
  aspect. 
  Purchased, 
  1867. 
  

  

  P. 
  964. 
  Portion 
  of 
  similar 
  cranial 
  roof, 
  labelled 
  Belonostomus 
  

   tenellus 
  by 
  Agassiz. 
  Egerton 
  Coll. 
  

  

  P. 
  965 
  b. 
  Mandible, 
  lateral 
  aspect, 
  showing 
  part 
  of 
  the 
  dentition 
  

   and 
  the 
  superficial 
  rugose 
  ornament, 
  and 
  the 
  continuity 
  

   of 
  the 
  articular 
  with 
  the 
  angular 
  bone. 
  Egerton 
  Coll. 
  

  

  P. 
  965 
  C. 
  Imperfect 
  small 
  mandible, 
  oral 
  aspect, 
  exhibiting 
  a 
  sharp 
  

   median 
  longitudinal 
  ridge 
  on 
  the 
  long 
  symphysis. 
  

  

  Egerton 
  Coll. 
  

  

  P. 
  513. 
  Symphysial 
  portion 
  of 
  mandible, 
  labelled 
  Belonostomus 
  

   tenellus 
  by 
  Agassiz, 
  and 
  intended 
  to 
  be 
  the 
  type 
  specimen 
  

   of 
  that 
  undefined 
  species. 
  On 
  account 
  of 
  the 
  form 
  of 
  the 
  

   fractured 
  extremity, 
  this 
  fossil 
  was 
  described 
  and 
  figured 
  

   as 
  a 
  presymphysial 
  bone 
  by 
  the 
  present 
  writer 
  in 
  the 
  

   Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xliv. 
  p. 
  147, 
  pi. 
  vii. 
  fig. 
  14 
  ; 
  

   but 
  such 
  a 
  determination 
  is 
  very 
  doubtful 
  and 
  not 
  con- 
  

   firmed 
  by 
  any 
  other 
  specimen. 
  Egerton 
  Coll. 
  

  

  P. 
  3790. 
  Head 
  and 
  remains 
  of 
  trunk, 
  without 
  fins, 
  noticed 
  by 
  the 
  

   present 
  writer 
  in 
  Ann. 
  Mag. 
  Nat. 
  Hist. 
  [6] 
  vol. 
  i. 
  p. 
  355, 
  

   and 
  three 
  of 
  the 
  dorsal 
  scutes 
  figured 
  in 
  Mem. 
  Geol. 
  Surv. 
  

   N. 
  S. 
  Wales, 
  Palseont. 
  no. 
  4, 
  pi. 
  viii. 
  fig. 
  7. 
  The 
  head 
  

   exhibits 
  the 
  typical 
  characters 
  of 
  the 
  species, 
  and 
  the 
  

   mandible 
  is 
  scarcely 
  shorter 
  than 
  the 
  upper 
  jaw. 
  Portions 
  

   of 
  the 
  operculum 
  and 
  clavicle 
  are 
  preserved, 
  and 
  remains 
  

   of 
  the 
  axial 
  skeleton 
  of 
  the 
  trunk 
  occur 
  beyond. 
  The 
  

   neural 
  arches 
  are 
  very 
  broad 
  and 
  bear 
  short 
  slender 
  neural 
  

   spines, 
  which 
  may 
  have 
  become 
  elongated 
  in 
  the 
  caudal 
  

   region 
  to 
  be 
  symmetrical 
  with 
  the 
  hsemals, 
  of 
  which 
  a 
  few 
  

  

  