﻿Freshwater 
  Fishes 
  from 
  Portuguese 
  Guinea. 
  375 
  

  

  to 
  3 
  times 
  in 
  length 
  of 
  head 
  ; 
  mouth 
  subinferior; 
  lips 
  

   moderately 
  developed 
  ; 
  two 
  barbels 
  on 
  each 
  side, 
  anterior 
  ^, 
  

   posterior 
  \ 
  diameter 
  of 
  eye. 
  Dorsal 
  III 
  8, 
  equally 
  distant 
  

   from 
  centre 
  of 
  eye 
  and 
  from 
  base 
  of 
  caudal, 
  border 
  feebly 
  

   concave; 
  last 
  simple 
  ray 
  not 
  enlarged, 
  as 
  long 
  as 
  head. 
  

   Anal 
  III 
  5, 
  not 
  reaching 
  caudal. 
  Pectoral 
  f 
  to 
  f 
  length 
  of 
  

   head, 
  not 
  quite 
  reaching 
  ventral 
  ; 
  base 
  of 
  latter 
  below 
  ante- 
  

   rior 
  rays 
  of 
  dorsal. 
  Caudal 
  peduncle 
  1-^ 
  to 
  1^ 
  times 
  as 
  long 
  

   as 
  deep. 
  Scales 
  radiately 
  striated, 
  23-25 
  |f, 
  2-2^ 
  between 
  

   lateral 
  line 
  and 
  ventral, 
  12 
  round 
  caudal 
  peduncle. 
  Yellow 
  

   above, 
  silvery 
  below, 
  scales 
  on 
  back 
  and 
  sides 
  finely 
  speckled 
  

   with 
  brown, 
  with 
  a 
  more 
  or 
  less 
  distinct 
  dark 
  brown 
  spot 
  at 
  

   the 
  base 
  ; 
  a 
  black 
  straight 
  lateral 
  band 
  from 
  the 
  end 
  of 
  the 
  

   snout, 
  through 
  the 
  eye, 
  to 
  the 
  base 
  of 
  the 
  caudal 
  ; 
  fins 
  yellow, 
  

   dorsal 
  and 
  caudal 
  orange 
  at 
  the 
  base 
  ; 
  a 
  blackish 
  spot 
  at 
  the 
  

   end 
  of 
  the 
  longest 
  rays 
  of 
  the 
  dorsal. 
  

  

  Total 
  length 
  65 
  millim. 
  

  

  Numerous 
  specimens 
  from 
  the 
  Geba 
  and 
  Culufi 
  Rivers. 
  

  

  Near 
  B. 
  ablabes, 
  Blkr. 
  Distinguished 
  by 
  the 
  much 
  larger 
  

   eye. 
  

  

  Synodontis 
  ansorgii. 
  

  

  Depth 
  of 
  body 
  3 
  to 
  3£ 
  times 
  in 
  total 
  length, 
  length 
  of 
  head 
  

   3§ 
  to 
  4 
  times. 
  Head 
  a 
  little 
  longer 
  than 
  broad, 
  granulate 
  

   above 
  from 
  between 
  the 
  eyes 
  ; 
  snout 
  rounded, 
  as 
  long 
  as 
  post- 
  

   ocular 
  part 
  of 
  head 
  ; 
  eye 
  supero-lateral, 
  3^ 
  (young) 
  to 
  4^- 
  

   times 
  in 
  length 
  of 
  head, 
  1J 
  to 
  1| 
  times 
  in 
  interorbital 
  width 
  ; 
  

   lips 
  moderately 
  developed 
  ; 
  praemaxillary 
  teeth 
  forming 
  a 
  

   short 
  and 
  very 
  broad 
  band; 
  movable 
  mandibular 
  teeth 
  £ 
  to 
  ^ 
  

   diameter 
  of 
  eye, 
  60 
  to 
  80 
  (50 
  in 
  young) 
  in 
  number. 
  Maxillary 
  

   barbel 
  with 
  a 
  broad 
  marginal 
  membrane 
  in 
  its 
  basal 
  third, 
  1 
  

   to 
  1^ 
  times 
  length 
  of 
  head, 
  reaching 
  between 
  anterior 
  fourth 
  

   and 
  posterior 
  third 
  of 
  pectoral 
  spine; 
  outer 
  mandibular 
  barbel 
  

   1^ 
  to 
  2 
  times 
  as 
  long 
  as 
  inner, 
  former 
  with 
  long 
  slender 
  

   branches, 
  latter 
  with 
  tubercular 
  ramifications. 
  Gill-opening 
  

   not 
  extending 
  downwards 
  beyond 
  root 
  of 
  pectoral 
  spine. 
  

   Occipito-nuchal 
  shield 
  granulate 
  like 
  the 
  occiput, 
  obtusely 
  

   tectiform, 
  1^ 
  to 
  If 
  times 
  as 
  long 
  as 
  broad, 
  posterior 
  processes 
  

   rounded 
  or 
  obliquely 
  truncate. 
  Humeral 
  process 
  much 
  longer 
  

   than 
  broad, 
  granulate, 
  not 
  keeled, 
  obtusely 
  pointed, 
  extending 
  

   as 
  far 
  or 
  not 
  quite 
  so 
  far 
  as 
  occipito-nuchal 
  process. 
  Dorsal 
  

  

  1 
  7 
  ; 
  spine 
  nearly 
  straight, 
  as 
  long 
  as 
  or 
  longer 
  than 
  head, 
  

   not 
  serrated, 
  terminating 
  in 
  a 
  long 
  filament. 
  Adipose 
  dorsal 
  

  

  2 
  to 
  3 
  times 
  as 
  long 
  as 
  deep, 
  2^ 
  to 
  3 
  times 
  as 
  long 
  as 
  its 
  

   distance 
  from 
  rayed 
  dorsal. 
  Anal 
  IV-V 
  7-8, 
  rounded. 
  

  

  