﻿THE 
  ANATOMY 
  OF 
  P(E()ILOCH^TUS, 
  OLAPAREDE. 
  119 
  

  

  under 
  suitable 
  conditions 
  at 
  the 
  base 
  of 
  the 
  intestinal 
  rods 
  of 
  

   the 
  dog." 
  

  

  The 
  similarity 
  in 
  structure 
  of 
  the 
  ciliated 
  cells 
  of, 
  say, 
  the 
  

   oesophagus 
  and 
  nuchal 
  organ 
  of 
  Poeciloch 
  fetus 
  to 
  that 
  of 
  

   the 
  cells 
  of 
  the 
  intestinal 
  mucous 
  membrane 
  of 
  vertebrates 
  

   furnished 
  with 
  a 
  '' 
  striated 
  border/' 
  as 
  described 
  by 
  Heiden- 
  

   hain 
  (1888), 
  is 
  very 
  striking, 
  especially 
  if 
  his 
  fig. 
  vi 
  is 
  com- 
  

   pared 
  with 
  my 
  figs. 
  44 
  or 
  41, 
  and 
  seems 
  strongly 
  to 
  support 
  

   the 
  suggestion 
  contained 
  in 
  Greenwood's 
  paper, 
  that 
  the 
  cells 
  

   of 
  the 
  vertebrate 
  intestine 
  may 
  be 
  modified 
  ciliated 
  cells. 
  

  

  Galvagui 
  (1903) 
  has 
  just 
  published 
  a 
  description 
  with 
  

   figures 
  showing 
  a 
  similar 
  structure 
  in 
  the 
  ciliated 
  cells 
  of 
  the 
  

   alimentary 
  canal 
  of 
  Ctenodrilus 
  to 
  that 
  found 
  in 
  Poecilo- 
  

   chaetus,^ 
  

  

  In 
  concluding 
  the 
  discussion 
  on 
  these 
  ciliated 
  cells 
  it 
  seems 
  

   worth 
  while 
  to 
  draw 
  attention 
  to 
  the 
  possibility 
  that 
  the 
  

   " 
  short 
  rods 
  " 
  described 
  in 
  this 
  paper 
  ( 
  '' 
  Fussstiicke 
  " 
  of 
  

   Engelmann) 
  are 
  homologous 
  with 
  the 
  middle-piece 
  (" 
  Mittel- 
  

   stiick 
  ") 
  so 
  well 
  known 
  in 
  spermatozoa. 
  The 
  staining 
  re- 
  

   actions 
  of 
  the 
  two 
  structures 
  are 
  similar, 
  and 
  they 
  occupy 
  

   similar 
  positions 
  in 
  relation 
  to 
  the 
  cilium 
  and 
  flagellum 
  

   respectively. 
  

  

  The 
  goblet-shaped 
  gland-cells 
  in 
  the 
  epithelium 
  of 
  the 
  

   oesophagus 
  present 
  themselves 
  in 
  at 
  least 
  three 
  forms. 
  In 
  

   preparations 
  preserved 
  and 
  stained 
  by 
  my 
  usual 
  method 
  these 
  

   cells 
  show 
  the 
  following 
  features 
  (see 
  PI. 
  11, 
  tig. 
  44) 
  : 
  — 
  (1) 
  

   Goblet-shaped 
  cells 
  crowded 
  with 
  granules 
  which 
  stain 
  bright 
  

   red, 
  the 
  bright 
  red 
  granules 
  filling 
  both 
  the 
  body 
  of 
  the 
  cell 
  

   and 
  the 
  long 
  neck 
  to 
  where 
  it 
  opens 
  into 
  the 
  lumen 
  of 
  the 
  

   oesophagus 
  ; 
  the 
  intermediate 
  substance 
  of 
  the 
  cell 
  remains 
  

   unstained; 
  the 
  chromatin 
  of 
  the 
  nucleus 
  stains 
  red; 
  the 
  

   nuclear 
  membrane 
  and 
  the 
  body 
  of 
  the 
  nucleus 
  are 
  clear 
  and 
  

   unstained 
  (fig. 
  44, 
  gl. 
  1). 
  

  

  (2) 
  Goblet-shaped 
  cells 
  containing 
  granules, 
  which 
  are 
  less 
  

  

  ' 
  Since 
  tlie 
  above 
  was 
  written 
  an 
  important 
  paper 
  on 
  the 
  epitlieliura 
  of 
  the 
  

   intestine 
  of 
  Polychsetes 
  has 
  been 
  published 
  by 
  Brasil 
  (1904) 
  in 
  which 
  the 
  

   structures 
  here 
  described 
  are 
  fullv 
  dealt 
  with. 
  

  

  