﻿THE 
  ANATOMY 
  OF 
  FcErTr.or'TT.I'lTTTS, 
  fTAPAKKDE. 
  121 
  

  

  Tlie 
  shape 
  of 
  the 
  epithelial 
  cells 
  may 
  differ 
  considerahly 
  fi-oin 
  

   that 
  of 
  those 
  found 
  in 
  the 
  aiitei'ior 
  part 
  of 
  the 
  aliiiientnry 
  

   canal 
  already 
  described. 
  In 
  those 
  sliown 
  in 
  fig. 
  45 
  the 
  cell- 
  

   body 
  is 
  short 
  and 
  broad^ 
  but 
  more 
  elongated 
  cells 
  are 
  also 
  

   common. 
  The 
  cells 
  are 
  filled 
  with 
  large 
  granules, 
  which 
  

   have 
  a 
  dark 
  brown 
  colour 
  in 
  preparations 
  preserved 
  with 
  

   osmic 
  acid 
  mixtures. 
  The 
  granules 
  are 
  crowded 
  together 
  at 
  

   that 
  surface 
  of 
  the 
  cell 
  which 
  immediately 
  l)orders 
  the 
  lumen 
  

   of 
  the 
  intestine, 
  and 
  are 
  more 
  scattered 
  tliroughout 
  the 
  rest 
  

   of 
  the 
  cell 
  protoplasm. 
  These 
  cells 
  have 
  not, 
  in 
  my 
  prepara- 
  

   tions, 
  the 
  appearance 
  of 
  being 
  ciliated. 
  Their 
  sui-face 
  is, 
  

   however, 
  covered 
  with 
  a 
  faintly 
  staining 
  substance, 
  which 
  

   might 
  possibly 
  represent 
  broken-down 
  cilia, 
  but 
  is 
  more 
  

   probably 
  a 
  layer 
  of 
  the 
  food-contents 
  of 
  the 
  intestine, 
  which 
  

   is 
  being 
  absorbed 
  by 
  the 
  cells. 
  In 
  the 
  same 
  sections 
  the 
  

   cilia 
  are 
  often 
  sufficiently 
  well-marked 
  on 
  the 
  cells 
  of 
  the 
  

   intestinal 
  groove. 
  The 
  nucleus 
  is 
  situated 
  near 
  the 
  base 
  of 
  

   the 
  cell. 
  In 
  the 
  condition 
  now 
  being 
  described 
  (fig. 
  45) 
  it 
  is 
  

   large 
  in 
  size 
  and 
  stains 
  deeply 
  (diffuse 
  blue 
  with 
  red 
  granules 
  

   in 
  methyl-blue-eosin 
  preparations). 
  It 
  consists 
  of 
  an 
  outer 
  

   membrane 
  filled 
  with 
  granules, 
  and 
  possesses 
  a 
  single 
  nucle- 
  

   olus. 
  This 
  nucleolus 
  is 
  surrounded 
  by 
  a 
  clear 
  space, 
  the 
  

   space 
  being 
  bordered 
  by 
  a 
  membrane 
  which 
  carries 
  on 
  its 
  

   outer 
  side 
  a 
  deeply 
  staining, 
  hemispherical 
  cap. 
  The 
  nucleus 
  

   thus 
  resembles 
  very 
  closely 
  the 
  nuclei 
  of 
  the 
  parapodial 
  gland- 
  

   cells 
  already 
  described 
  (cf. 
  fig. 
  2G 
  and 
  p. 
  98). 
  Nuclei 
  

   showing 
  clearly 
  all 
  the 
  points 
  mentioned 
  are 
  not, 
  however, 
  

   met 
  with 
  very 
  frequently 
  in 
  the 
  preparations. 
  The 
  bases 
  of 
  

   these 
  cells 
  lie 
  close 
  to 
  the 
  blood-sinus 
  which 
  completely 
  

   surrounds 
  the 
  intestine 
  (fig. 
  45, 
  i.hl.s.). 
  

  

  If 
  one 
  may 
  be 
  permitted 
  to 
  hazard 
  a 
  guess 
  at 
  the 
  ])h3'sio- 
  

   logical 
  processes 
  which 
  are 
  going 
  on 
  in 
  these 
  cells, 
  merely 
  

   from 
  a 
  study 
  of 
  their 
  appearance 
  and 
  the 
  arrangement 
  of 
  

   their 
  parts, 
  it 
  may 
  be 
  suggested 
  that 
  the 
  cells 
  at 
  their 
  free 
  

   ends 
  are 
  absorbing 
  from 
  the 
  cavity 
  of 
  the 
  intestine 
  food 
  

   material 
  already 
  partly 
  digested 
  by 
  the 
  action 
  of 
  the 
  secretion 
  

   from 
  the 
  gland-cells. 
  A 
  portion, 
  at 
  least, 
  of 
  this 
  material 
  

  

  VOL. 
  48, 
  PART 
  1. 
  NEW 
  SERIES. 
  9 
  

  

  