﻿296 
  Transaciions. 
  — 
  Zoology. 
  

  

  Pseudo-brancliiffi 
  well-developed. 
  Pyloric 
  appendages 
  in 
  moderate 
  num- 
  

   bers; 
  ova 
  small. 
  

  

  Marine 
  fish 
  which 
  never 
  enter 
  fresh 
  waters, 
  and 
  hitherto 
  found 
  only 
  in 
  

   some 
  parts 
  of 
  European 
  waters, 
  i.e., 
  coasts 
  of 
  Norway, 
  rarely 
  coasts 
  of 
  

   Scotland 
  and 
  islands 
  and 
  the 
  Mediterranean. 
  

  

  Argentina 
  decagon, 
  nov. 
  sp. 
  

  

  D.IO, 
  2nd 
  adipose; 
  P.14 
  ; 
  V.12; 
  A.ll 
  ; 
  C.19 
  ; 
  B.5 
  ; 
  L. 
  Trans. 
  \; 
  

  

  L. 
  Lat. 
  51. 
  ^ 
  

  

  First 
  dorsal 
  situated 
  in 
  depression 
  on 
  back 
  ; 
  adipose 
  dorsal 
  high 
  ; 
  pectorals 
  

   small, 
  fragile 
  ; 
  ventrals 
  rather 
  large, 
  fragile, 
  large 
  axillary 
  scale 
  ; 
  caudal 
  

   large, 
  deeply 
  forked 
  ; 
  eye 
  large, 
  round 
  ; 
  mouth 
  very 
  small, 
  and 
  protractile 
  

   to 
  some 
  extent 
  ; 
  anal 
  fin 
  very 
  high 
  anteriorly 
  (this 
  fin 
  and 
  adipose 
  dorsal 
  

   placed 
  close 
  to 
  caudal 
  ; 
  cheeks 
  and 
  head 
  scaleless, 
  top 
  of 
  head 
  flat, 
  head 
  

   small, 
  snout 
  pointed; 
  operculum, 
  suboperculum 
  and 
  preoperculum 
  covered 
  

   with 
  thick 
  transparent 
  (immaculate) 
  glossy 
  flesh 
  (showing 
  colouring 
  pig- 
  

   ment 
  on 
  bony 
  plates 
  in 
  a 
  very 
  beautiful 
  manner) 
  ; 
  lower 
  angle 
  of 
  preoper- 
  

   culum 
  and 
  interoperculum 
  free 
  from 
  fleshy 
  substance 
  ; 
  nostrils 
  small, 
  

   double, 
  one 
  placed 
  before 
  vertical 
  of 
  front 
  of 
  orbit, 
  the 
  other 
  near 
  tip 
  of 
  

   snout 
  ; 
  back;, 
  belly 
  and 
  sides 
  rather 
  flattened, 
  but 
  body 
  thick. 
  

  

  No 
  teeth 
  on 
  superior 
  or 
  intermaxillaries 
  or 
  on 
  inferior 
  maxillaries, 
  but 
  

   the 
  front 
  edge 
  of 
  vomer 
  is 
  produced 
  and 
  bare 
  and 
  crenulated, 
  forming 
  dental 
  

   apparatus 
  ; 
  edges 
  of 
  palatines 
  bared, 
  forming 
  cutting 
  apparatus 
  ; 
  tongue 
  

   long, 
  thin, 
  narrow, 
  and 
  round, 
  with 
  four 
  long 
  recurved 
  fangs 
  at 
  tip 
  ; 
  gill- 
  

   arches 
  armed 
  with 
  long 
  rakers 
  ; 
  gills 
  four 
  and 
  one 
  pseudo-gill 
  ; 
  upper 
  jaw 
  

   projects 
  slightly 
  over 
  lower. 
  

  

  Head 
  rounded 
  under 
  throat 
  ; 
  eye 
  large 
  ; 
  gill-opening 
  large, 
  section 
  

   through 
  body 
  shows 
  same 
  to 
  be 
  an 
  irregular 
  decagon 
  in 
  shape. 
  

  

  Scales 
  (in 
  beautifully 
  arranged 
  series) 
  very 
  large, 
  thin, 
  and 
  covered 
  with 
  

   silvery 
  pigment 
  on 
  lateral 
  band, 
  very 
  bright, 
  duller 
  on 
  series 
  su.perior 
  and 
  

   inferior 
  to 
  same. 
  Scales 
  along 
  lateral 
  line 
  high 
  and 
  narrow, 
  with 
  large 
  

   core, 
  the 
  opening 
  of 
  which 
  is 
  dkected 
  towards 
  head. 
  At 
  the 
  angles 
  of 
  the 
  

   irregular 
  decagon 
  the 
  scales 
  are 
  large, 
  squared 
  in 
  front, 
  rounded 
  at 
  back, 
  

   and 
  bent 
  in 
  an 
  angular 
  form 
  with 
  an 
  opening 
  or 
  slit 
  extending 
  some 
  

   distance 
  into 
  scale. 
  These 
  scales 
  overlap 
  in 
  the 
  centres 
  of 
  the 
  facets 
  of 
  the 
  

   decagon, 
  and 
  over 
  these, 
  and 
  extending 
  nearly 
  from 
  angle 
  to 
  angle, 
  are, 
  on 
  

   the 
  dorsal, 
  second, 
  third 
  lateral 
  band 
  and 
  ventral 
  facets 
  superposed, 
  large 
  

   deep 
  rounded 
  scales 
  filling 
  up 
  intervals 
  between 
  angles 
  of 
  decagon, 
  and 
  

   causing 
  the 
  ribbed 
  appearance 
  of 
  body 
  ; 
  the 
  depression 
  at 
  lateral 
  line 
  is 
  also 
  

   caused 
  by 
  these 
  large 
  scales 
  overlapping 
  in 
  unbroken 
  marginal 
  line, 
  above 
  

   and 
  below 
  samca 
  

  

  