﻿SOME 
  NliW 
  SPECIES 
  OP 
  THE 
  GENUS 
  FHREODIULUS. 
  287 
  

  

  longer, 
  and 
  narrower, 
  and 
  the 
  lumen 
  is 
  considerably 
  reduced 
  

   in 
  size, 
  while 
  the 
  cytoplasm 
  loses 
  its 
  vacuolar 
  character 
  as 
  

   the 
  granules 
  became 
  arranged 
  more 
  compactly. 
  

  

  A 
  comparison 
  of 
  my 
  fig. 
  19 
  agrees 
  closely 
  witli 
  tlie 
  figure 
  

   12 
  of 
  Beddard's 
  memoir. 
  

  

  The 
  spermiducal 
  gland, 
  after 
  entering 
  the 
  muscular 
  sac, 
  

   becomes 
  much 
  narrowed 
  to 
  form 
  the 
  neck 
  ; 
  this 
  decrease 
  

   in 
  size 
  continues, 
  and 
  the 
  change 
  in 
  the 
  character 
  of 
  the 
  

   epithelium 
  is 
  more 
  marked 
  three 
  sections 
  lower 
  down 
  (fig. 
  

   21), 
  at 
  the 
  level 
  of 
  the 
  entrance 
  of 
  the 
  vas 
  deferens. 
  The 
  

   epithelium 
  (at 
  n) 
  has 
  become 
  quite 
  low, 
  and 
  the 
  distinctness 
  

   of 
  the 
  cell 
  outlines 
  has 
  disappeared. 
  The 
  cytoplasm 
  becomes 
  

   deeply 
  stained, 
  and 
  the 
  nuclei, 
  hitherto 
  circular 
  in 
  outline, 
  

   both 
  in 
  the 
  sperm-duct 
  (s. 
  d.) 
  and 
  in 
  the 
  spermiducal 
  gland 
  

   [gl.), 
  and 
  only 
  moderately 
  deeply 
  stained, 
  now 
  become 
  oval 
  

   or 
  elliptical, 
  and 
  are 
  quite 
  darkly 
  stained 
  in 
  borax 
  carmine; 
  

   they 
  are 
  also 
  much 
  more 
  closely 
  arranged 
  than 
  before. 
  This 
  

   narrowed 
  neck 
  of 
  the 
  spei'miducal 
  gland 
  (cf. 
  P. 
  lacustris, 
  

   and 
  Beddard's 
  figure 
  of 
  P. 
  alb 
  us) 
  is 
  of 
  veiy 
  short 
  extent, 
  

   occurring 
  only 
  in 
  six 
  or 
  seven 
  consecutive 
  transverse 
  sections 
  

   of 
  the 
  apparatus. 
  

  

  It 
  is 
  into 
  this 
  short 
  narrow 
  neck 
  of 
  the 
  gland 
  that 
  the 
  

   sperm-duct 
  opens. 
  The 
  structure 
  of 
  this 
  sperm-duct 
  calls 
  for 
  

   no 
  particular 
  description, 
  as 
  it 
  agrees 
  with 
  the 
  usual 
  account, 
  

   except 
  that 
  in 
  comparison 
  with 
  the 
  larger 
  Oligocha^tes 
  the 
  

   number 
  of 
  nuclei 
  seen 
  in 
  a 
  transverse 
  section 
  is 
  very 
  small, 
  

   usually 
  only 
  three 
  or 
  four 
  (fig. 
  20), 
  they 
  take 
  the 
  stain 
  only 
  

   very 
  feebly; 
  the 
  cytoplasm 
  is 
  faintly 
  granular; 
  and 
  the 
  cells 
  

   are 
  of 
  course 
  ciliated. 
  

  

  Passing 
  now 
  to 
  the 
  " 
  atrial 
  sac 
  " 
  and 
  its 
  contained 
  tube 
  — 
  

   the 
  common 
  duct 
  of 
  gland 
  and 
  vas 
  deferens, 
  — 
  which 
  is 
  con- 
  

   veniently 
  termed 
  the 
  ''atrium."^. 
  A 
  transverse 
  section 
  of 
  

  

  * 
  In 
  his 
  account 
  of 
  P. 
  subterraneus 
  Beddard 
  uses 
  the 
  term 
  "atrium" 
  

   to 
  indicate 
  only 
  the 
  wide, 
  non-ciliated 
  portion 
  of 
  the 
  tube 
  within 
  the 
  muscular 
  

   sac 
  — 
  ^^the 
  portion 
  shaded 
  in 
  his 
  fig. 
  7, 
  — 
  while 
  the 
  narrow, 
  much 
  convoluted 
  

   (white) 
  canal, 
  which 
  is 
  ciliated 
  internally, 
  into 
  which 
  the 
  " 
  diverticulum 
  " 
  

   (spermiducal 
  gland) 
  opens, 
  he 
  speaks 
  of 
  as 
  a 
  continuation 
  of 
  the 
  vas 
  deferens. 
  

  

  