﻿304 
  W. 
  BLAXr,AND 
  BENHAM. 
  

  

  The 
  nephridial 
  funnel, 
  lying 
  in 
  Segment 
  TX, 
  is 
  situated 
  

   immediately 
  in 
  front 
  of 
  the 
  root 
  of 
  the 
  first 
  testis, 
  as 
  shown 
  

   in 
  the 
  figure 
  of 
  the 
  longitudinal 
  section 
  of 
  this 
  region 
  of 
  the 
  

   immature 
  individual 
  (fig. 
  14). 
  The 
  funnel 
  is 
  smaller 
  than 
  

   that 
  of 
  the 
  post-ovarian 
  nephridium. 
  

  

  I 
  was 
  unable 
  to 
  trace 
  this 
  first 
  nephridium 
  to 
  the 
  body- 
  

   wall 
  ; 
  it 
  was 
  easy 
  enough 
  to 
  follow 
  it 
  upwards 
  to 
  a 
  point 
  

   close 
  to 
  the 
  body-wall 
  near 
  the 
  lateral 
  line, 
  some 
  little 
  way 
  in 
  

   front 
  of 
  the 
  cliEet^e, 
  but 
  there 
  it 
  seems 
  to 
  cease. 
  

  

  It 
  is 
  interesting 
  to 
  find 
  that 
  Forbes 
  Avas 
  equally 
  unable 
  to 
  

   find 
  a 
  pore 
  in 
  the 
  case 
  of 
  the 
  first 
  nephridium 
  in 
  "Phreo- 
  

   ryctes 
  emissarius.'^ 
  

  

  Reproductive 
  System. 
  — 
  There 
  are 
  two 
  pairs 
  of 
  testes' 
  

   attached 
  to 
  the 
  anterior 
  wall 
  of 
  Segments 
  X, 
  XI 
  respectively, 
  

   and 
  on 
  the 
  posterior 
  wall 
  of 
  each 
  of 
  these 
  segments 
  is 
  a 
  pair 
  

   of 
  spermiducal 
  funnels 
  of 
  a 
  simple 
  plate-like 
  form. 
  

  

  The 
  course 
  of 
  the 
  sperm-duct 
  from 
  funnel 
  to 
  the 
  body-wall 
  

   is 
  shown 
  in 
  figs. 
  IG 
  — 
  24. 
  

  

  Each 
  of 
  the 
  four 
  sperm-ducts 
  leaves 
  its 
  funnel 
  close 
  to 
  the 
  

   lower 
  or 
  ventral 
  margin 
  (fig. 
  32), 
  as 
  described 
  by 
  Beddard 
  

   (1) 
  for 
  H. 
  smithi; 
  it 
  then 
  passes 
  through 
  the 
  septum, 
  and 
  

   afterwards 
  behind 
  the 
  funnel 
  and 
  outside 
  the 
  following 
  testis 
  ; 
  

   it 
  soon 
  becomes 
  slightly 
  undulating, 
  and 
  reaches 
  to 
  the 
  level 
  

   of 
  the 
  lateral 
  line 
  ; 
  then, 
  bending 
  down, 
  it 
  reaches 
  the 
  body- 
  

   wall 
  at 
  a 
  point 
  about 
  midway 
  between 
  the 
  margin 
  of 
  the 
  

   segment 
  and 
  the 
  ventral 
  chfeta 
  (figs. 
  24, 
  29). 
  

  

  I 
  have 
  been 
  quite 
  unable, 
  however, 
  to 
  detect 
  any 
  external 
  

   opening 
  in 
  either 
  of 
  the 
  four 
  ducts, 
  and, 
  indeed, 
  only 
  in 
  the 
  

   case 
  of 
  the 
  left 
  duct 
  of 
  the 
  anterior 
  pair 
  was 
  I 
  able 
  to 
  trace 
  

   it 
  actually 
  to 
  the 
  body-wall 
  and 
  into 
  continuity 
  with 
  the 
  

   epidermis 
  (fig. 
  29). 
  

  

  Owing 
  to 
  the 
  slight 
  obliquity 
  of 
  the 
  sections 
  and 
  to 
  the 
  

   displacement 
  due 
  to 
  the 
  previous 
  compression 
  in 
  mounting 
  

   the 
  specimen, 
  the 
  duct 
  of 
  one 
  side 
  is 
  cut 
  transversely, 
  and 
  

   that 
  of 
  the 
  other 
  side 
  longitudinally 
  in 
  at 
  any 
  rate 
  part 
  of 
  

   its 
  course 
  (fig. 
  28), 
  and 
  in 
  this 
  figure 
  both 
  the 
  upward 
  and 
  

   downward 
  part 
  of 
  the 
  canal 
  are 
  involved. 
  The 
  duct 
  has 
  

   almost 
  all 
  the 
  appearance 
  of 
  a 
  nephridium, 
  and 
  its 
  general 
  

  

  