﻿322 
  Mr. 
  C. 
  T. 
  Regan 
  on 
  the 
  Osteology 
  and 
  

  

  the 
  same 
  conclusion 
  in 
  the 
  case 
  of 
  Poictlia 
  and 
  Anableps 
  

   (Hist. 
  Nat. 
  Poiss. 
  xviii. 
  1846, 
  pp. 
  126, 
  258), 
  and 
  Philippi 
  

   lias 
  recently 
  shown 
  that 
  Glaridichthys 
  and 
  Cnesterodon 
  are 
  

   phvsoclists 
  (Sitzungsb. 
  (iesellsch. 
  naturf. 
  Freund. 
  1906, 
  

   p. 
  232). 
  

  

  Starks 
  has 
  published 
  some 
  notes 
  on 
  the 
  osteology 
  of 
  

   Amblyopsis, 
  Cyprinodon 
  } 
  Fundulus, 
  and 
  Poecilia 
  (Biol. 
  Bull. 
  

   vii. 
  1904). 
  

  

  Suborder 
  1. 
  AMBLYOPSOIDEA. 
  

  

  Mouth 
  rather 
  wide, 
  not 
  protractile 
  ; 
  teeth 
  in 
  jaws 
  and 
  on 
  

   palatines 
  ; 
  gill-membranes 
  attached 
  to 
  isthmus 
  ; 
  pelvic 
  fins 
  

   small 
  or 
  absent; 
  vent 
  jugular. 
  Parietals 
  large; 
  opisthotic 
  

   normal. 
  Palatine 
  distinct 
  from 
  pterygoid 
  ; 
  metapterygoid 
  

   present. 
  No 
  post-cleithrura. 
  Prabcaudal 
  vertebrae 
  with 
  

   parapophyses 
  from 
  the 
  fourth 
  ; 
  firot 
  two 
  ribs 
  sessile. 
  

  

  Family 
  Aniblyopsidae. 
  

  

  This 
  family 
  includes 
  CJiologaster 
  and 
  the 
  blind 
  cave-fishes 
  

   Amblyopsis 
  and 
  Typhlichthys 
  (cf. 
  Jord. 
  & 
  Everm. 
  Bull. 
  U.S. 
  

   Nat. 
  Mus. 
  xlvii. 
  1896, 
  p. 
  702). 
  I 
  am 
  able 
  to 
  confirm 
  Stark's 
  

   account 
  of 
  the 
  skeleton 
  of 
  Amblyopsis 
  (Biol. 
  Bull. 
  vii. 
  1904, 
  

   p. 
  261), 
  except 
  for 
  the 
  statement 
  that 
  all 
  the 
  praecaudal 
  

   vertebrae 
  have 
  parapophyses. 
  Eigenmann 
  has 
  studied 
  the 
  

   degeneration 
  of 
  the 
  eyes 
  in 
  the 
  blind 
  cave-fishes 
  (' 
  Cave 
  

   Vertebrates 
  of 
  America 
  ' 
  : 
  Washington, 
  1909). 
  

  

  Suborder 
  2. 
  Pcecilioidea. 
  

  

  Mouth 
  small, 
  unless 
  the 
  jaws 
  are 
  produced 
  ; 
  praemaxillaries 
  

   usually 
  protractile 
  ; 
  maxillary 
  little 
  movable, 
  adnate 
  to 
  prae- 
  

   orbital 
  ; 
  teeth 
  in 
  jaws 
  and 
  sometimes 
  on 
  vomer, 
  never 
  on 
  

   palatines 
  ; 
  gill-membranes 
  free 
  from 
  isthmus 
  ; 
  pelvic 
  fins 
  

   usually 
  weil-developed, 
  6-rayed, 
  sometimes 
  absent. 
  Parietals, 
  

   when 
  present, 
  small 
  or 
  moderate; 
  opisthotic, 
  if 
  present, 
  

   adherent 
  to 
  outer 
  surface 
  of 
  exoccipital. 
  Palatine 
  and 
  ptery- 
  

   goid 
  ankylosed 
  ; 
  no 
  metapterygoid. 
  A 
  single 
  laminar 
  post- 
  

   cleithrum 
  on 
  each 
  side 
  (except 
  in 
  Anableps). 
  Praecaudal 
  

   vertebrae 
  with 
  parapophyses 
  from 
  the 
  first 
  or 
  second; 
  all 
  the 
  

   ribs 
  on 
  parapophyses. 
  

  

  The 
  fishes 
  of 
  this 
  suborder 
  have 
  usually 
  been 
  regarded 
  as 
  

   a 
  single 
  family, 
  Cyprinodontidae 
  or 
  Pceciliida? 
  ; 
  in 
  that 
  case 
  

   several 
  subfamilies 
  should 
  be 
  recognized. 
  

  

  