﻿On 
  new 
  Fishes 
  in 
  (he 
  British 
  Museum. 
  215 
  

  

  and 
  will 
  be 
  placed 
  at 
  the 
  disposal 
  of 
  the 
  British 
  Museum. 
  

   Dr. 
  Wise 
  has 
  also 
  sent 
  specimens 
  of 
  the 
  same 
  species 
  to 
  the 
  

   British 
  Museum 
  direct, 
  and 
  these 
  — 
  'thanks 
  to 
  the 
  kindness 
  ot' 
  

   Mr. 
  E. 
  E. 
  Austen, 
  whose 
  ungrudging 
  assistance 
  in 
  other 
  

   ways 
  I 
  have 
  also 
  to 
  acknowledge 
  — 
  have 
  been 
  compared 
  in 
  

   formulating 
  the 
  description 
  of 
  the 
  species. 
  

  

  XXIV. 
  — 
  Description 
  of 
  Two 
  new 
  Tetragonopterid 
  Fishes 
  in 
  

   the 
  British 
  Museum. 
  By 
  Prof. 
  C. 
  H. 
  ElGENMANN. 
  

  

  During 
  a 
  visit 
  to 
  the 
  British 
  Museum 
  to 
  examine 
  types 
  of 
  

   South-American 
  freshwater 
  fishes 
  Mr. 
  G. 
  A. 
  Boulenger 
  

   referred 
  the 
  following 
  new 
  material 
  to 
  me 
  for 
  identification. 
  

  

  Nematobrycon, 
  gen. 
  nov. 
  

  

  Caudal 
  three-pronged, 
  the 
  middle 
  two 
  rays 
  nearly 
  as 
  long 
  

   as, 
  or 
  even 
  longer 
  than, 
  the 
  outer 
  rays, 
  which 
  are 
  prolonged, 
  

   filiform. 
  Lateral 
  line 
  incomplete; 
  no 
  adipose 
  fin; 
  pre- 
  

   maxillary 
  teeth 
  multicuspid, 
  in 
  two 
  series 
  ; 
  maxillary 
  with 
  

   large 
  conical 
  teeth 
  along 
  nearly 
  its 
  entire 
  length 
  ; 
  caudal 
  

   naked. 
  

  

  A 
  Tetragonopterid 
  genus 
  distinguished 
  from 
  all 
  other 
  

   genera 
  of 
  the 
  subfamily 
  by 
  the 
  absence 
  of 
  an 
  adipose 
  fin 
  and 
  

   the 
  filamentous 
  three 
  lobes 
  of 
  the 
  caudal. 
  

  

  Nematobrycon 
  palmeri, 
  sp. 
  n. 
  

  

  Several 
  specimens, 
  8-20 
  mm., 
  from 
  Condoto, 
  Rio 
  Condoto, 
  

   and 
  Novila, 
  Rio 
  Tamana, 
  S.W. 
  Colombia. 
  Collected 
  by 
  

   Mr. 
  M. 
  Gr. 
  Palmer. 
  British 
  Museum. 
  

  

  Head 
  4-2 
  ; 
  depth 
  266 
  ; 
  D. 
  10 
  or 
  11; 
  A. 
  29-31. 
  Scales 
  

   7 
  — 
  7 
  + 
  26 
  — 
  5. 
  Eye 
  3 
  in 
  head, 
  '5-"75 
  in 
  snout, 
  about 
  equal 
  to 
  

   interorbital. 
  

  

  Compressed, 
  resembling 
  Crenuchus 
  and 
  P 
  ozcilocharax 
  in 
  

   general 
  appearance 
  and 
  the 
  absence 
  of 
  an 
  adipose 
  fin 
  ; 
  dorsal 
  

   and 
  ventral 
  profiles 
  nearly 
  equally 
  arched 
  ; 
  highest 
  point 
  of 
  

   dorsal 
  profile 
  at 
  origin 
  of 
  dorsal 
  fin 
  ; 
  ventral 
  profile 
  regularly 
  

   arched 
  ; 
  predorsal 
  area 
  with 
  a 
  median 
  series 
  of 
  about 
  seven 
  

   scales 
  ; 
  preventral 
  area 
  narrowly 
  rounded 
  ; 
  occipital 
  process 
  

   with 
  three 
  scales 
  on 
  each 
  side, 
  the 
  process 
  about 
  one-fifth 
  

   as 
  long 
  as 
  its 
  distance 
  from 
  its 
  base 
  to 
  the 
  dorsal; 
  frontal 
  

   fontanel 
  minute 
  ; 
  interorbital 
  moderately 
  convex 
  ; 
  second 
  

   suborbital 
  heavy, 
  convex, 
  iu 
  contact 
  with 
  the 
  preopercle 
  

  

  