﻿EPITHELIAL 
  ISLETS 
  OP 
  THE 
  PANCKEAS 
  IN 
  TELEOSTEI. 
  387 
  

  

  it 
  in 
  few 
  fresh 
  species, 
  and 
  these 
  were 
  of 
  small 
  size, 
  where 
  it 
  

   is 
  liable 
  to 
  be 
  missed 
  when 
  sought 
  for 
  by 
  macroscopic 
  methods. 
  

   It 
  will 
  be 
  seen 
  that 
  the 
  position 
  is 
  practically 
  the 
  same 
  in 
  all 
  

   cases. 
  It 
  lies 
  a 
  short 
  distance 
  in 
  front 
  of 
  the 
  spleen 
  in 
  the 
  

   mesenteric 
  fold 
  between 
  the 
  portal 
  vein 
  and 
  the 
  mesenteric 
  

   artery. 
  In 
  a 
  certain 
  number 
  this 
  islet, 
  though 
  still 
  in 
  

   a 
  position 
  agreeing 
  generally 
  with 
  the 
  foregoing, 
  has 
  a 
  relation 
  

   which 
  enables 
  its 
  situation 
  to 
  be 
  even 
  more 
  exactly 
  stated. 
  

   It 
  is 
  in 
  close 
  proximity 
  to 
  the 
  gall-bladder, 
  and 
  has 
  the 
  

   appearance 
  of 
  a 
  compact 
  nodule 
  attached 
  to 
  its 
  base 
  or 
  

   posterior 
  wall. 
  

  

  In 
  the 
  following 
  species 
  — 
  Agon 
  us 
  cataphractus, 
  

   Lophius 
  piscatorius, 
  Pholis 
  gunnellus, 
  Anarrhi- 
  

   chas 
  lupus, 
  Zoarces 
  viviparus, 
  Onos 
  mustela, 
  

   Ammodytes 
  tobianus, 
  Hippoglossus 
  vulgaris, 
  and 
  

   Pleuronectes 
  platessa 
  — 
  I 
  found 
  an 
  islet 
  at 
  the 
  pylorus. 
  

   It 
  was 
  always 
  smaller 
  in 
  size 
  than 
  the 
  " 
  principal." 
  This 
  is 
  

   the 
  one 
  referred 
  to 
  in 
  my 
  preliminary 
  note. 
  Although 
  I 
  can- 
  

   not 
  at 
  present 
  say 
  that 
  it 
  is 
  constant, 
  its 
  presence 
  here 
  in 
  so 
  

   many 
  different 
  species 
  is 
  of 
  interest 
  and 
  an 
  indication 
  at 
  any 
  

   rate 
  that 
  this 
  is 
  a 
  common 
  position. 
  In 
  one 
  particular 
  instance, 
  

   Lophius 
  piscatorius, 
  I 
  endeavoured 
  to 
  obtain 
  some 
  evidence 
  

   on 
  this 
  question 
  of 
  constantly 
  occurring 
  islets. 
  This 
  species 
  is 
  

   the 
  one 
  in 
  which 
  I 
  have 
  found 
  the 
  largest 
  number 
  of 
  these 
  

   bodies. 
  I 
  examined 
  many 
  hundreds 
  of 
  specimens 
  and 
  I 
  noted 
  — 
  

  

  1. 
  That 
  the 
  "principal," 
  the 
  largest 
  islet 
  (see 
  PJ. 
  27, 
  fig. 
  2), 
  

   was 
  present 
  in 
  every 
  case. 
  

  

  2. 
  That 
  an 
  islet 
  at 
  the 
  pylorus 
  (PI. 
  27, 
  fig. 
  2, 
  Is. 
  1), 
  and 
  the 
  

   islet 
  marked 
  " 
  Is. 
  2 
  " 
  occurred 
  very 
  frequently, 
  although 
  they 
  

   were 
  not 
  found 
  in 
  eveiy 
  case. 
  

  

  3. 
  That 
  there 
  seemed 
  to 
  be 
  considerable 
  variation 
  in 
  the 
  

   numbers 
  of 
  the 
  others. 
  

  

  These 
  facts 
  are 
  in 
  complete 
  accordance 
  with 
  the 
  suggestion 
  

   I 
  have 
  already 
  made. 
  Here 
  constant 
  and 
  varying 
  islets 
  

   exist, 
  whose 
  relations 
  may 
  be 
  compared 
  to 
  those 
  of 
  thyroid 
  

   and 
  accessory 
  thyroids 
  or 
  spleen 
  and 
  accessory 
  spleens.^ 
  

  

  ' 
  In 
  this 
  connection 
  it 
  is 
  worthy 
  of 
  note 
  that 
  I 
  found 
  accessory 
  spleens 
  of 
  

  

  