﻿THE 
  ANATOMY 
  OF 
  PCECJLOCH 
  JITUS, 
  CLAPAREDE. 
  99 
  

  

  the 
  rods 
  appear 
  circular) 
  wliicli 
  stain 
  a 
  deeper 
  blue 
  than 
  the 
  

   ground 
  substance 
  of 
  their 
  cell, 
  but 
  do 
  not 
  take 
  on 
  by 
  any 
  

   means 
  the 
  intense 
  blue 
  colour 
  of 
  the 
  granules 
  in 
  cells 
  of 
  

   Type 
  A. 
  The 
  nuclei 
  of 
  cells 
  of 
  Type 
  B 
  resemble 
  those 
  of 
  

   Type 
  A 
  in 
  general 
  structure. 
  The 
  nucleolus 
  is, 
  however, 
  

   somewhat 
  smaller, 
  and 
  all 
  the 
  structures 
  take 
  on 
  a 
  much 
  less 
  

   intense 
  stain. 
  A 
  noteworthy 
  feature 
  in 
  the 
  sections 
  of 
  these 
  

   cells 
  is 
  that 
  the 
  cell-substance 
  outside 
  the 
  nucleus 
  contains 
  

   patches 
  of 
  fine 
  red 
  granules 
  exactly 
  resembling 
  the 
  red 
  

   granules 
  seen 
  in 
  the 
  nucleus 
  itself. 
  These 
  patches 
  occur 
  

   more 
  especially 
  in 
  immediate 
  contact 
  with 
  the 
  nucleus, 
  and 
  

   their 
  whole 
  appearance 
  seems 
  to 
  suggest 
  very 
  strougly 
  that 
  

   the 
  granules 
  are 
  being 
  manufactured 
  in 
  the 
  nucleus 
  and 
  

   passed 
  out 
  into 
  the 
  surrounding 
  substance. 
  

  

  For 
  a 
  valuable 
  summary 
  of 
  our 
  knowledge 
  of 
  the 
  part 
  

   played 
  by 
  the 
  nucleus 
  in 
  secretion, 
  and 
  a 
  very 
  extensive 
  list 
  

   of 
  the 
  papers 
  dealing 
  with 
  this 
  subject, 
  reference 
  may 
  be 
  

   made 
  to 
  a 
  recent 
  paper 
  by 
  Launoy 
  (1903). 
  

  

  Type 
  C. 
  — 
  In 
  cells 
  of 
  the 
  third 
  type 
  (fig. 
  29), 
  which 
  also 
  

   occur 
  in 
  the 
  cirri 
  of 
  segments 
  from 
  14 
  backwards, 
  the 
  ground 
  

   substance 
  stains 
  pale 
  blue, 
  shows 
  a 
  reticular 
  structure 
  in 
  pre- 
  

   parations 
  preserved 
  in 
  Hermann's 
  fluid, 
  and 
  contains 
  a 
  few 
  

   deeply 
  staining 
  rods. 
  The 
  nucleus 
  stains 
  deeply 
  and 
  diffusely, 
  

   but 
  is 
  shrunken 
  and 
  irregular 
  in 
  shape. 
  Cells 
  of 
  this 
  type 
  

   are 
  apparently 
  those 
  in 
  which 
  the 
  process 
  of 
  the 
  formation 
  of 
  

   the 
  secretory 
  product 
  is 
  complete 
  and 
  the 
  nucleus 
  no 
  longer 
  

   active. 
  If 
  this 
  be 
  so 
  they 
  are 
  in 
  reality 
  a 
  later 
  stage 
  in 
  the 
  

   condition 
  of 
  cells 
  of 
  Type 
  B. 
  

  

  If 
  fragments 
  of 
  the 
  living 
  worm 
  are 
  strongly 
  irritated, 
  a 
  

   large 
  mass 
  of 
  clear, 
  transparent 
  mucus 
  is 
  secreted, 
  which 
  is 
  

   in 
  all 
  probability 
  discharged 
  from 
  the 
  gland- 
  cells 
  of 
  the 
  cirri 
  

   above 
  described. 
  

  

  For 
  a 
  summarised 
  account 
  of 
  epithelial 
  gland- 
  cells 
  of 
  

   various 
  kinds 
  found 
  in 
  other 
  Polychsetes 
  reference 
  may 
  be 
  

   made 
  to 
  Eisig's 
  monograph 
  on 
  the 
  Capitellidae 
  (Eisig, 
  1887). 
  

  

  