﻿306 
  W. 
  BLAXLAND 
  BENE 
  AM. 
  

  

  tinctly 
  in 
  most 
  of 
  the 
  sections. 
  These 
  points 
  of 
  difference 
  

   require 
  very 
  high 
  magnification, 
  and 
  are 
  not 
  recognisable 
  

   vvitliout 
  a 
  homogeneous 
  immersiou 
  lens. 
  But 
  if 
  there 
  is 
  a 
  close 
  

   similarity 
  between 
  the 
  excretory 
  and 
  genital 
  ducts, 
  there 
  is 
  an 
  

   immense 
  difference 
  between 
  the 
  spermiducal 
  funnel, 
  with 
  its 
  

   high 
  ciliated 
  cells 
  forming 
  a 
  conspicuous, 
  broad, 
  thick 
  disc 
  on 
  

   the 
  septum 
  (fig. 
  31 
  et 
  seq.), 
  and 
  the 
  minute 
  nephridial 
  

   funnel 
  just 
  projecting 
  through 
  a 
  septum. 
  

  

  In 
  the 
  Segments 
  XI, 
  XII 
  I 
  find 
  no 
  nephridia 
  — 
  no 
  tubes, 
  

   i.e. 
  besides 
  the 
  sperm-ducts, 
  — 
  nor 
  is 
  there 
  any 
  funnel 
  belong- 
  

   ing 
  to 
  these 
  tubes 
  other 
  than 
  the 
  flat, 
  wide 
  sperm-funnels. 
  

   Even 
  in 
  the 
  immature 
  worms 
  no 
  nephridial 
  funnels 
  exist 
  

   alongside 
  the 
  young 
  sperm-funnels 
  (fig. 
  37). 
  

  

  It 
  is 
  a 
  curious 
  fact 
  that 
  the 
  sperm-ducts, 
  even 
  in 
  a 
  worm 
  

   in 
  which 
  ripe 
  sperms 
  fill 
  I 
  he 
  sperm-sacs 
  as 
  well 
  as 
  the 
  sper- 
  

   matheca?, 
  and 
  with 
  large 
  ova 
  in 
  their 
  proper 
  segments, 
  

   should 
  be 
  so 
  difficult 
  to 
  trace 
  ; 
  Michaelsen, 
  too, 
  was 
  unable 
  to 
  

   follow 
  their 
  course 
  in 
  sections 
  of 
  H. 
  gordioides, 
  or 
  to 
  

   detect 
  the 
  pores, 
  though 
  it 
  is 
  true 
  his 
  specimens 
  do 
  not 
  appear 
  

   to 
  have 
  been 
  as 
  f 
  idly 
  mature 
  as 
  is 
  one 
  of 
  my 
  individuals. 
  

  

  There 
  are 
  two 
  median 
  unpaired 
  sperm-sacs, 
  or, 
  more 
  

   properly, 
  septal 
  pouches 
  which 
  act 
  as 
  sperm-sacs 
  (figs. 
  1, 
  16). 
  

  

  Segment 
  X 
  is 
  filled 
  with 
  loose 
  masses 
  of 
  developing 
  sper- 
  

   matozoa 
  in 
  all 
  stages, 
  mostly 
  fully 
  formed; 
  the 
  Septum 
  

   X/XI 
  is 
  pushed 
  backwards 
  above 
  the 
  gut, 
  and 
  is 
  also 
  filled 
  

   with 
  sperms 
  ; 
  the 
  end 
  of 
  this 
  sac 
  is 
  at 
  about 
  the 
  level 
  of 
  the 
  

   end 
  of 
  Segment 
  XI. 
  In 
  Segment 
  XI 
  we 
  have 
  a 
  repetition 
  of 
  

   this; 
  its 
  hinder 
  wall 
  is 
  also 
  pouched, 
  and 
  reaches 
  to 
  the 
  

   middle 
  of 
  the 
  thirteenth 
  segment. 
  

  

  There 
  is 
  only 
  a 
  single 
  pair 
  of 
  ovaries, 
  which 
  are 
  

   situated 
  in 
  Segment 
  XII 
  ; 
  I 
  sought 
  in 
  vain 
  for 
  a 
  second 
  pair 
  

   both 
  in 
  the 
  entire 
  and 
  in 
  sectionised 
  specimens. 
  

  

  A 
  single 
  pair 
  of 
  oviducts 
  corresponding 
  to 
  these 
  ovaries 
  

   starts 
  from 
  large, 
  wide, 
  flat 
  funnels 
  in 
  Segment 
  XII 
  (cf. 
  figs. 
  

   1, 
  38). 
  The 
  oviduct 
  (figs. 
  38 
  — 
  42) 
  is 
  a 
  remarkably 
  wide 
  tube, 
  

   of 
  much 
  greater 
  diameter 
  than 
  the 
  sperm-duct. 
  It 
  is 
  at 
  first 
  

   directed 
  backwards, 
  and 
  continues 
  in 
  this 
  direction 
  for 
  some 
  

  

  