﻿SOME 
  NEW 
  SPECIES 
  OF 
  THM 
  GENUS 
  PHEEODKILUS. 
  277 
  

  

  deferens" 
  iu 
  P. 
  subterraiieus^ 
  whicli, 
  as 
  Micliaelsen 
  has 
  

   recently 
  pointed 
  out, 
  is 
  nothing 
  else 
  than 
  a 
  spermiducal 
  gland 
  

   or 
  '^prostate" 
  of 
  some 
  authors. 
  The 
  wall 
  of 
  the 
  gland 
  is 
  

   formed 
  of 
  large 
  rounded 
  cells 
  (seen 
  superficially 
  in 
  fig. 
  6 
  

   and 
  in 
  transverse 
  section 
  at 
  a, 
  fig. 
  7), 
  with 
  finely 
  granular 
  

   cytoplasm, 
  outside 
  which 
  is 
  a 
  layer 
  of 
  flat 
  peritoneal 
  nuclei 
  

   (c. 
  e.), 
  but 
  I 
  am 
  unable 
  to 
  detect 
  any 
  muscular 
  coat. 
  

  

  At 
  its 
  proximal 
  extremity, 
  i. 
  e. 
  the 
  neck, 
  the 
  glandular 
  

   cells 
  gradually 
  cease 
  (fig. 
  7), 
  and 
  the 
  epithelium 
  becomes 
  

   quite 
  low 
  and 
  the 
  nuclei 
  flattened; 
  and 
  both 
  cytoplasm 
  and 
  

   nuclei 
  are 
  much 
  more 
  deeply 
  stained 
  (in 
  borax 
  carmine) 
  than 
  

   in 
  the 
  rest 
  of 
  the 
  gland. 
  It 
  is 
  into 
  this 
  neck 
  that 
  the 
  sperm- 
  

   duct 
  enters 
  (fig. 
  6). 
  

  

  The 
  common 
  duct, 
  or 
  atrium 
  as 
  it 
  may 
  be 
  conveniently 
  

   termed, 
  now 
  perforates 
  a 
  cylindrical 
  penis, 
  whicli 
  when 
  at 
  

   rest 
  lies 
  enclosed 
  iu 
  a 
  peuial 
  sac 
  (figs. 
  5, 
  6). 
  The 
  orifice 
  of 
  

   the 
  atrium 
  (o^j.) 
  is 
  subterminal. 
  

  

  This 
  penis 
  — 
  which 
  in 
  one 
  specimen 
  was 
  partly 
  protruded 
  

   through 
  the 
  male 
  pore 
  (figs. 
  4, 
  6) 
  — 
  consists 
  of 
  the 
  following 
  

   tissues 
  : 
  — 
  An 
  internal 
  epitlielium, 
  a 
  muscuUir 
  coat, 
  and 
  an 
  

   external 
  epitlielium. 
  The 
  lumen 
  is 
  small, 
  and 
  the 
  internal 
  

   epithelium 
  secretes 
  a 
  cuticle, 
  and 
  is 
  not 
  ciliated. 
  The 
  cells 
  

   are 
  low, 
  with 
  large 
  round 
  nuclei 
  ; 
  the 
  muscles 
  {mp.) 
  are 
  

   both 
  circularly 
  and 
  longitudinally 
  arranged 
  (perhaps 
  in 
  reality 
  

   they 
  are 
  oblique), 
  and 
  outside 
  is 
  the 
  more 
  cubical 
  epithelium, 
  

   with 
  larger 
  oval 
  nuclei. 
  This 
  epithelium 
  is 
  continuous 
  at 
  

   the 
  base 
  of 
  the 
  penis 
  with 
  the 
  lining 
  of 
  the 
  penial 
  sac 
  (fig. 
  7). 
  

   These 
  latter 
  cells 
  are, 
  when 
  viewed 
  superficially 
  (fig. 
  6, 
  e.), 
  

   more 
  or 
  less 
  hexagonal 
  in 
  form, 
  and 
  arranged 
  in 
  circular 
  rows 
  

   with 
  some 
  regularity. 
  The 
  lining 
  of 
  this 
  sac 
  extends 
  up 
  to 
  

   the 
  epidermis, 
  and 
  round 
  the 
  pore 
  there 
  is 
  an 
  abrupt 
  change 
  

   in 
  the 
  character 
  of 
  the 
  cells 
  (fig. 
  7). 
  Outside 
  them 
  is 
  a 
  layer 
  

   of 
  circular 
  muscles, 
  but 
  I 
  cannot 
  detect 
  any 
  peritoneal 
  cells 
  

   covering 
  them. 
  The 
  longitudinal 
  muscles 
  of 
  the 
  body-wall 
  

   are 
  connected 
  with 
  the 
  base 
  and 
  side 
  of 
  the 
  apparatus, 
  and 
  they 
  

   appear 
  to 
  pass 
  round 
  the 
  penial 
  sac 
  to 
  form 
  ])art 
  at 
  least, 
  if 
  

   not 
  ihe 
  whole, 
  of 
  its 
  muscular 
  coat, 
  which 
  dies 
  out 
  before 
  the 
  

  

  