﻿138 
  PROCEEDiyOS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  u^. 
  Cheeks, 
  opercles, 
  and 
  usually 
  top 
  of 
  

  

  head 
  posteriorly 
  scaled; 
  lateral 
  

  

  line 
  interrupted 
  in 
  the 
  middle; 
  

  

  body 
  relatively 
  short. 
  

  

  v^. 
  Palatine 
  teeth 
  absent; 
  margin 
  of 
  

  

  preopercle 
  firm, 
  ending 
  in 
  an 
  

  

  obtuse-angled 
  point. 
  

  

  Grammonus. 
  

   v^. 
  Palatine 
  teeth 
  present; 
  margin 
  of 
  

   preopercle 
  fleshy, 
  unarmed. 
  

   w^. 
  Head 
  low, 
  depressed; 
  tips 
  of 
  

   clavicular 
  bones 
  firmly 
  united; 
  

   D. 
  85 
  to 
  98; 
  A. 
  68. 
  

   x^. 
  Ventral 
  filaments 
  simple; 
  eyes 
  

   superior; 
  rudimentary 
  pylo- 
  

   ric 
  cceca 
  present. 
  . 
  . 
  Catxtyx. 
  

   x^. 
  Ventral 
  filaments 
  bifid; 
  eyea 
  

   dorso 
  - 
  lateral; 
  head 
  pike- 
  

   like; 
  pyloric 
  coeca 
  absent. 
  

  

  Luciohrotula. 
  

  

  w^. 
  Head 
  robust, 
  rounded; 
  tips 
  of 
  

  

  clavicular 
  bones 
  more 
  or 
  less 
  

  

  free; 
  D. 
  76; 
  A. 
  b2. 
  . 
  .Bythites. 
  

  

  t^. 
  Ventrals 
  absent; 
  six 
  or 
  more 
  developed 
  

  

  gill-rakers 
  on 
  first 
  arch. 
  

  

  y^. 
  Head 
  normal, 
  cheeks 
  and 
  

   opercles 
  scaled; 
  preopercle 
  

   armed 
  with 
  five 
  spines; 
  six 
  

   developed 
  gill 
  - 
  rakers 
  on 
  

   first 
  arch; 
  rudimentary 
  py- 
  

   loric 
  cceca 
  present; 
  lateral 
  

   line 
  present. 
  . 
  . 
  Xenohythites. 
  

   y^. 
  (Hephthocarin^.) 
  Head 
  

   greatly 
  dilated, 
  covered 
  

   with 
  a 
  thick, 
  gelatinous, 
  

   Bcaleless 
  skin; 
  pyloric 
  cceca 
  

   absent; 
  lateral 
  line 
  indistin- 
  

   guishable 
  Eephthocara. 
  

  

  Genus 
  NEOBYTHITES 
  Goode 
  and 
  Bean. 
  

  

  Neohyihites 
  Goode 
  and 
  Bean, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  8, 
  1885, 
  p. 
  600, 
  gilli. 
  

   TTatasea 
  Jordan 
  and 
  Snyder, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  23, 
  1901 
  , 
  p. 
  765, 
  sivicola. 
  

  

  Body 
  elongate, 
  compressed; 
  head 
  rounded, 
  its 
  bones 
  firm, 
  both 
  

   head 
  and 
  body 
  covered 
  with 
  small 
  cycloid 
  scales; 
  tail 
  not 
  filamentous, 
  

   lateral 
  line 
  usually 
  distinct, 
  becoming 
  obsolete 
  posteriorly; 
  oper- 
  

   culum 
  armed 
  with 
  a 
  single 
  strong 
  spine; 
  preoperculum 
  armed 
  at 
  or 
  

   near 
  its 
  angle 
  with 
  1 
  or 
  2 
  small 
  spines; 
  no 
  barbels; 
  mouth 
  large, 
  

   snout 
  moderate, 
  rounded, 
  projecting 
  very 
  slighth^- 
  bej'-ond 
  mouth; 
  

   teeth 
  villiform, 
  in 
  broad 
  bands 
  on 
  both 
  jaws, 
  palatines, 
  tongue, 
  and 
  

   lower 
  pharyngeals, 
  a 
  patch 
  on 
  vomer, 
  and 
  5 
  small 
  patches 
  on 
  each 
  

   side 
  on 
  upper 
  pharyngeals; 
  gill-openings 
  wide, 
  the 
  membranes 
  deeply 
  

   cleft 
  and 
  not 
  attached 
  to 
  the 
  isthmus; 
  vertical 
  fins 
  united; 
  ventrals 
  

  

  