﻿10 
  JOURNAL 
  OF 
  THE 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  VOIv. 
  12, 
  NO. 
  1 
  

  

  It 
  is 
  known 
  that 
  this 
  fish 
  may 
  be 
  caught 
  on 
  bait 
  of 
  mussels 
  {Mytilus, 
  

   according 
  to 
  Nilsson), 
  or 
  on 
  pieces 
  of 
  herring.^ 
  According 
  to 
  Holt,^ 
  

   one 
  specimen 
  caught 
  off 
  the 
  coast 
  of 
  Ireland 
  had 
  in 
  its 
  stomach 
  remains 
  

   of 
  shrimps 
  and 
  copepods, 
  one 
  of 
  which 
  was 
  identified 
  as 
  Calamus 
  

   finmarchichus, 
  which 
  is 
  known 
  to 
  inhabit 
  the 
  bottom. 
  

  

  VISCERAL 
  ANATOMY 
  

  

  Alimentary 
  Tract 
  and 
  Spiral 
  Valve 
  

  

  The 
  presence 
  of 
  a 
  spiral 
  valve 
  is 
  of 
  considerable 
  interest 
  since 
  up 
  

   to 
  the 
  present 
  time 
  but 
  one 
  living 
  adult 
  Teleost 
  was 
  known 
  to 
  possess 
  

   a 
  true 
  spiral 
  valve 
  in 
  the 
  intestine. 
  

  

  Fig. 
  1. 
  Stomach 
  and 
  intestine 
  of 
  Argentina 
  silus 
  X 
  Vs- 
  — 
  h 
  attachment 
  of 
  liver; 
  

   s, 
  cardiac 
  limb 
  of 
  stomach; 
  p, 
  pyloric 
  limb 
  of 
  stomach; 
  pc, 
  pyloric 
  caeca; 
  

   <f, 
  duodenum; 
  5Z>, 
  spiral 
  valve; 
  c, 
  rectum. 
  ^, 
  small 
  portion 
  of 
  spiral 
  valve, 
  

   with 
  part 
  of 
  the 
  outer 
  wall 
  removed 
  to 
  show 
  internal 
  structure, 
  semi-diagram- 
  

   matic, 
  X 
  6. 
  

  

  In 
  Argentina 
  silus 
  it 
  has 
  no 
  doubt 
  been 
  overlooked 
  partly 
  because 
  

   its 
  presence 
  hitherto 
  was 
  unsuspected 
  and 
  also 
  because 
  of 
  the 
  com- 
  

   paratively 
  few 
  specimens 
  available 
  for 
  study. 
  It 
  is 
  not 
  known 
  from 
  

   the 
  limited 
  material 
  examined 
  whether 
  or 
  not 
  this 
  structure 
  is 
  as 
  

   variable 
  in 
  different 
  individuals 
  of 
  Argentina 
  silus 
  as 
  it 
  is 
  known 
  to 
  

   be 
  in 
  different 
  individuals 
  of 
  some 
  species 
  of 
  rays 
  and 
  sharks. 
  The 
  

   two 
  specimens 
  at 
  hand 
  were 
  essentially 
  the 
  same, 
  each 
  showing 
  a 
  

   true 
  spiral 
  cavity 
  wound 
  around 
  a 
  small 
  central 
  canal. 
  Thus, 
  the 
  

  

  * 
  F. 
  A. 
  SMifT, 
  Scandinavian 
  Fishes, 
  ed. 
  2, 
  2: 
  916. 
  Stockholm, 
  1895. 
  

  

  ' 
  W. 
  L. 
  Holt, 
  The 
  Great 
  Silver 
  Smelt, 
  Argentina 
  silus, 
  Nilss. 
  An 
  addition 
  to 
  the 
  List 
  

   of 
  British 
  Fishes. 
  Journal 
  of 
  the 
  Marine 
  Biological 
  Association 
  of 
  the 
  United 
  Kingdom. 
  

   N. 
  S. 
  5: 
  341-342. 
  1897-99. 
  

  

  