﻿2 
  Mr. 
  C. 
  T. 
  Regan 
  on 
  the 
  Anatomy 
  and 
  

  

  In 
  the 
  following 
  account 
  both 
  recent 
  and 
  extinct 
  forms 
  

   are 
  dealt 
  with, 
  and 
  the 
  more 
  important 
  characters 
  of 
  the 
  

   order 
  and 
  its 
  component 
  families 
  are 
  set 
  forth 
  ; 
  three 
  families, 
  

   Berycopsidse, 
  Diretmidae, 
  and 
  Anomalopidse, 
  hitherto 
  regarded 
  

   as 
  of 
  uncertain 
  affinities, 
  are 
  assigned 
  a 
  definite 
  place 
  in 
  the 
  

   system, 
  and 
  the 
  Melamphaidse, 
  until 
  now 
  included 
  in 
  the 
  

   Berycidse, 
  are 
  rejected 
  from 
  the 
  order. 
  

  

  Order 
  Beeycomoephi. 
  

  

  Parietals 
  separated 
  by 
  the 
  supraoccipital 
  ; 
  nasals 
  large, 
  

   posteriorly 
  attached 
  to 
  the 
  frontals 
  ; 
  opisthotic 
  well-deve- 
  

   loped, 
  bounded 
  in 
  front 
  by 
  the 
  pro-otic 
  and 
  below 
  by 
  the 
  

   exoccipital; 
  orbitosphenoid 
  present, 
  united 
  by 
  suture 
  with 
  

   the 
  alisphenoids, 
  but 
  well 
  separated 
  from 
  the 
  mesethmoid; 
  

   a 
  Y-shaped 
  basisphenoid 
  present 
  ; 
  a 
  thin-walled 
  auditory 
  

   bulla, 
  containing 
  a 
  large 
  otolith, 
  formed 
  by 
  the 
  pro-otic, 
  

   pavasphenoid, 
  basi-occipital, 
  exoccipital, 
  and 
  sometimes 
  the 
  

   opisthotic. 
  Mouth 
  bordered 
  above 
  by 
  the 
  protractile 
  pras- 
  

   maxillaries 
  ; 
  maxillary 
  articulated 
  with 
  the 
  vomer 
  and 
  

   attached 
  near 
  its 
  proximal 
  end 
  to 
  the 
  well-developed 
  maxil- 
  

   lary 
  prooess 
  of 
  the 
  palatine 
  ; 
  one 
  or 
  two 
  supramaxillaries 
  ; 
  

   lower 
  jaw 
  of 
  dentary, 
  articulare 
  and 
  angulare. 
  First 
  pharyngo- 
  

   brancliial 
  suspensory 
  ; 
  third 
  and 
  fourth 
  ankylosed 
  ; 
  lower 
  

   pharyngeals 
  separate 
  ; 
  three 
  ossified 
  basi-brauchials. 
  4 
  gills 
  ; 
  

   pseudobranchise 
  ; 
  7 
  to 
  9 
  branchiostegals. 
  Hyo-palatine 
  and 
  

   opercular 
  bones 
  normally 
  developed. 
  Vertebral 
  column 
  of 
  

   solid 
  centra 
  which 
  are 
  co-ossified 
  with 
  the 
  arches 
  ; 
  anterior 
  

   ribs 
  sessile 
  ; 
  posterior 
  ribs 
  on 
  parapophyses 
  ; 
  hypurals 
  more 
  

   or 
  less 
  fused 
  and 
  expanded; 
  three 
  epurals 
  (epaxial 
  basalia) 
  

   and 
  two 
  uroneurals. 
  Post-temporal 
  forked, 
  attached 
  to 
  the 
  

   epiotic 
  and 
  opisthotic 
  ; 
  usually 
  two 
  post-cleithra 
  on 
  each 
  side 
  ; 
  

   no 
  mesocoracoid 
  ; 
  pectoral 
  radials 
  four, 
  hourglass-shaped, 
  

   only 
  the 
  lowest 
  in 
  contact 
  with 
  the 
  hypocoracoid. 
  Air- 
  

   bladder 
  without 
  pneumatic 
  duct*. 
  Anterior 
  rays 
  of 
  vertical 
  

   fins 
  spinous 
  ; 
  pelvic 
  fins 
  thoracic 
  or 
  subabdominal, 
  with 
  or 
  

   without 
  spine 
  and 
  with 
  from 
  3 
  to 
  13 
  soft 
  rays 
  ; 
  caudal 
  fin 
  

   typically 
  with 
  19 
  principal 
  rays, 
  17 
  of 
  which 
  are 
  branched 
  

   (18, 
  with 
  16 
  blanched, 
  in 
  the 
  Polymixiidse). 
  

  

  Family 
  1. 
  Polymixiidse. 
  

  

  Dorsal 
  and 
  anal 
  fins 
  long 
  or 
  moderately 
  elongate, 
  with 
  a 
  

   few 
  graduated 
  spines 
  and 
  rather 
  numerous 
  soft 
  rays 
  ; 
  caudal 
  

  

  * 
  I 
  cannot 
  find 
  a 
  duct 
  in 
  any 
  of 
  the 
  genera 
  I 
  ha-ve 
  examined, 
  including 
  

   Beryx 
  and 
  Holocentrus, 
  which 
  are 
  said 
  to 
  be 
  physostomous. 
  

  

  