﻿4 
  Mr. 
  C. 
  T. 
  Regan 
  on 
  the 
  Anatomy 
  and 
  

  

  In 
  addition 
  to 
  the 
  recent 
  Potymixia, 
  Lowe, 
  the 
  Cretaceous 
  

   Phtycormus, 
  W. 
  von 
  der 
  Marck, 
  may 
  be 
  placed 
  in 
  this 
  

   family 
  ; 
  it 
  has 
  been 
  well 
  described 
  and 
  figured, 
  and 
  shows 
  

   many 
  important 
  resemblances 
  to 
  the 
  recent 
  genus. 
  The 
  less 
  

   satisfactorily 
  known 
  Omosoma, 
  Costa, 
  and 
  Pycnosterinx, 
  

   Heck., 
  may 
  be 
  provisionally 
  associated 
  with 
  Platycormus. 
  

  

  Family 
  2. 
  Berycopsidse. 
  

  

  Berycopsis 
  elegans, 
  Dixon, 
  from 
  the 
  Chalk 
  of 
  Sussex 
  and 
  

   Kent, 
  has 
  been' 
  fully 
  described 
  and 
  figured 
  by 
  Dr. 
  Smith 
  

   Woodward. 
  It 
  is 
  in 
  some 
  respects 
  intermediate 
  between 
  the 
  

   Polyinixiidae 
  and 
  Berycidas, 
  but 
  is 
  well 
  distinguished 
  from 
  

   both. 
  

  

  Dorsal 
  and 
  anal 
  fins 
  as 
  in 
  the 
  Polyinixiidae; 
  pelvic 
  fins 
  not 
  

   well 
  known, 
  perhaps 
  as 
  in 
  the 
  Polymixiidae; 
  two 
  supra- 
  

   maxillaries 
  formed 
  as 
  in 
  Beryx, 
  the 
  posterior 
  large 
  and 
  

   sending 
  forward 
  a 
  pointed 
  process 
  above 
  the 
  anterior 
  ; 
  ptery- 
  

   goid 
  teeth 
  present 
  ; 
  occipital 
  and 
  parietal 
  crests 
  terminating 
  

   above 
  the 
  middle 
  of 
  the 
  orbit 
  ; 
  suborbitals 
  narrow, 
  praeorbital 
  

   deep, 
  and 
  maxillary 
  exposed; 
  vertebrae 
  at 
  least 
  26 
  and 
  per- 
  

   haps 
  as 
  many 
  as 
  30. 
  

  

  Family 
  3. 
  Berycidae. 
  

  

  Dorsal 
  and 
  anal 
  with 
  a 
  few 
  graduated 
  spines 
  ; 
  caudal 
  with 
  

   17 
  branched 
  rays 
  ; 
  pelvics 
  thoracic, 
  of 
  a 
  spine 
  and 
  7 
  to 
  13 
  

   soft 
  rays. 
  Jaws 
  with 
  villiform 
  teeth 
  in 
  bands 
  ; 
  teeth 
  on 
  

   vomer 
  and 
  palatines. 
  Upper 
  edge 
  of 
  maxillary 
  slipping 
  

   under 
  prseorbital 
  and 
  anterior 
  suborbitals 
  ; 
  two 
  supra- 
  

   maxillaries, 
  the 
  posterior 
  sending 
  forward 
  a 
  pointed 
  process 
  

   above 
  the 
  anterior 
  ; 
  subocular 
  shelf 
  formed 
  by 
  several 
  sub- 
  

   orbitals, 
  or 
  at 
  least 
  extending 
  the 
  whole 
  length 
  of 
  the 
  second 
  ; 
  

   nasals 
  moderately 
  large, 
  separated 
  by 
  the 
  prsemaxillary 
  pro- 
  

   cesses, 
  but 
  nearly 
  meeting 
  above 
  them 
  anteriorly 
  ; 
  supra- 
  

   occipital 
  and 
  parietals 
  not 
  overlapped 
  by 
  the 
  frontals, 
  with 
  

   prominent 
  crests 
  which 
  extend 
  forward 
  on 
  the 
  latter 
  to 
  the 
  

   interorbital 
  region 
  ; 
  frontals 
  anteriorly 
  with 
  prominent 
  

   ridges 
  bordering 
  mucus 
  cavities 
  ; 
  alisphenoids 
  united 
  by 
  

   suture. 
  Hypocoracoids 
  not 
  narrowed 
  forward, 
  reaching 
  the 
  

   ventral 
  profile 
  and 
  forming 
  a 
  symphysis 
  behind 
  that 
  of 
  the 
  

   cleithra; 
  pelvic 
  bones 
  embraced 
  by 
  the 
  hypocoracoids 
  and 
  

   attached 
  to 
  the 
  cleithra 
  above 
  the 
  symphysis. 
  Vertebrae 
  24; 
  

   no 
  upturned 
  centra, 
  and 
  the 
  anterior 
  uroneural 
  ankylosed 
  with 
  

   the 
  last 
  centrum. 
  

  

  There 
  are 
  two 
  very 
  distinct 
  genera, 
  viz., 
  Beryx, 
  Cuv., 
  and 
  

   Hoplopteryx, 
  Agass. 
  The 
  former, 
  with 
  species 
  from 
  the 
  

  

  