﻿ON 
  A 
  NEW 
  SPEOIKS 
  OF 
  THE 
  GEN[T8 
  HAFLOTAXIS. 
  o03 
  

  

  I 
  failed 
  to 
  detect 
  any 
  cilia 
  in 
  the 
  lumen 
  of 
  the 
  nepliridial 
  

   canal 
  . 
  

  

  I 
  have 
  not 
  endeavoui'ed 
  to 
  trace 
  out 
  the 
  course 
  of 
  the 
  lumen 
  

   in 
  detail, 
  but 
  I 
  note 
  thnt 
  for 
  the 
  greater 
  part 
  of 
  its 
  course 
  its 
  

   wall 
  is 
  quite 
  simple, 
  i. 
  c. 
  is 
  formed 
  by 
  the 
  faintly 
  granular 
  

   protoplasm 
  of 
  the 
  perforated 
  cells; 
  bu(/ 
  at 
  the 
  apex 
  of 
  the 
  

   loop 
  there 
  is 
  a 
  differentiation 
  of 
  this 
  protoplasm 
  to 
  form 
  a 
  

   more 
  distinct, 
  apparently 
  striated, 
  boundary 
  to 
  the 
  lumen 
  

   (fig. 
  13, 
  a), 
  comparable 
  to 
  the 
  wall 
  of 
  the 
  " 
  ampulla 
  " 
  in 
  the 
  

   nephridinm 
  of 
  Lnmbricus. 
  

  

  After 
  leaving 
  the 
  funnel 
  the 
  nepliridial 
  loop 
  mounts 
  up 
  

   alongside 
  the 
  gut, 
  and 
  nearly 
  reaches 
  the 
  dorsal 
  body-wall. 
  

  

  The 
  nepliridial 
  canal 
  passes 
  to 
  the 
  body-wall 
  a 
  short 
  dis- 
  

   tance 
  in 
  front 
  of 
  the 
  ventral 
  chteta 
  (figs. 
  5, 
  6, 
  7), 
  passing 
  

   amongst 
  the 
  cha3tal 
  muscles 
  to 
  the 
  cheetal 
  gap 
  in 
  the 
  longitu- 
  

   dinal 
  musde 
  of 
  the 
  body-wall. 
  Here 
  the 
  structure 
  of 
  the 
  

   nepliridial 
  cells 
  suddenly 
  changes 
  ; 
  the 
  cytoplasm 
  is 
  now 
  very 
  

   highly 
  granular, 
  the 
  cells, 
  or 
  rather 
  syncytium, 
  becoming 
  

   much 
  more 
  deeply 
  stained 
  than 
  elsewhere; 
  there 
  is 
  no 
  trace 
  

   of 
  the 
  cytoplasmic 
  network 
  which 
  is 
  observable 
  in 
  the 
  greater 
  

   part 
  of 
  the 
  nephridinm; 
  the 
  nuclei, 
  too, 
  are 
  rather 
  different 
  

   (figs. 
  10, 
  11). 
  This 
  very 
  granular 
  region 
  may, 
  for 
  conveni- 
  

   ence, 
  be 
  termed 
  the 
  '^duct;" 
  but 
  although 
  I 
  traced 
  the 
  

   nephridial 
  canal 
  thus 
  far, 
  I 
  was 
  uuable 
  to 
  detect 
  any 
  perfo- 
  

   ration 
  of 
  the 
  more 
  superficial 
  granular 
  cells. 
  They 
  pass 
  

   through 
  the 
  muscular 
  wall 
  into 
  the 
  epidermis, 
  where 
  the}^ 
  

   spread 
  out 
  slightly; 
  but 
  I 
  could 
  detect 
  no 
  pore. 
  

  

  This 
  "duct" 
  is 
  readily 
  distinguished 
  from 
  the 
  surrounding 
  

   epidermis 
  by 
  its 
  affinity 
  for 
  the 
  stain, 
  the 
  epidermal 
  cells 
  

   appear 
  homogeneous, 
  and 
  spaces 
  exist 
  between 
  the 
  bases 
  of 
  

   many 
  of 
  the 
  cells. 
  The 
  " 
  duct," 
  however, 
  passes 
  right 
  

   through 
  the 
  epidermis 
  to 
  the 
  surface. 
  

  

  The 
  nephridinm 
  in 
  Segment 
  X 
  appears 
  to 
  be 
  in 
  a 
  state 
  of 
  

   degeneration 
  ; 
  it 
  is 
  relatively 
  smaller 
  than 
  the 
  following 
  

   ones, 
  and 
  the 
  loop 
  only 
  reaches 
  upward 
  as 
  far 
  as 
  the 
  lateral 
  

   line, 
  though 
  the 
  diameter 
  of 
  the 
  body 
  is 
  here 
  greater 
  than 
  it 
  

   is 
  more 
  posteriorly 
  (figs. 
  12 
  and 
  13). 
  

  

  