﻿500 
  Dr. 
  L. 
  Cognetti 
  de 
  Martiis 
  on 
  the 
  

  

  septum 
  to 
  the 
  male 
  pore, 
  which 
  is 
  placed 
  just 
  behind 
  the 
  

   circle 
  of 
  setse 
  (PI. 
  XIII. 
  fig. 
  6). 
  Penial 
  setse 
  are 
  wanting. 
  

  

  There 
  are 
  two 
  pairs 
  of 
  spermathecse 
  in 
  segments 
  viii. 
  and 
  

   ix. 
  The 
  main 
  pouch 
  is 
  club-shaped 
  ; 
  the 
  diverticulum 
  is 
  

   finger-shaped 
  and 
  opens 
  into 
  the 
  distal 
  part 
  of 
  the 
  duct 
  of 
  

   the 
  main 
  pouch. 
  The 
  length 
  of 
  the 
  diverticulum 
  is 
  nearly 
  

   equal 
  to 
  a 
  third 
  of 
  the 
  main 
  pouch 
  (PL 
  XIII. 
  fig. 
  7). 
  

  

  Hob. 
  Coorloon 
  {Mr. 
  Shungara 
  Narayana, 
  23. 
  vi. 
  1910). 
  

  

  An 
  important 
  character 
  of 
  this 
  new 
  species 
  of 
  Megascolex 
  

   is 
  the 
  presence 
  of 
  large 
  paired 
  meganephridia 
  in 
  the 
  anterior 
  

   segments. 
  Similar 
  nephridia 
  have 
  been 
  found 
  by 
  Prof. 
  

   Benham 
  in 
  Megascolex 
  laingii, 
  Benh.*, 
  but 
  perhaps 
  in 
  the 
  

   cephalic 
  region 
  only, 
  where 
  they 
  " 
  probably 
  " 
  perform 
  the 
  

   office 
  of 
  peptonephridia. 
  

  

  Megascolex 
  ratus, 
  sp. 
  n. 
  (PL 
  XIII. 
  figs. 
  8-10.) 
  

  

  Four 
  mature 
  specimens 
  in 
  the 
  collection, 
  but 
  only 
  three 
  

   of 
  these 
  are 
  complete. 
  

  

  External 
  characters. 
  — 
  Length 
  : 
  A 
  230, 
  B 
  260, 
  C 
  315 
  mm. 
  ; 
  

   greatest 
  thickness, 
  on 
  x. 
  segment: 
  A 
  7, 
  B 
  9, 
  C 
  10 
  mm. 
  

   Number 
  of 
  segments 
  : 
  A 
  162, 
  B 
  168, 
  C 
  218. 
  

  

  Colour 
  dorsally 
  violet-brown 
  or 
  dark 
  violet, 
  ventrally 
  grey 
  ; 
  

   grey 
  lines 
  are 
  present 
  corresponding 
  to 
  the 
  circles 
  of 
  seta;. 
  

  

  Head 
  tanylobous. 
  The 
  prostomium 
  is 
  short, 
  broad, 
  and 
  

   provided 
  dorsally 
  with 
  longitudinal 
  furrows, 
  prolonged 
  on 
  

   to 
  the 
  first 
  segment; 
  this 
  segment 
  is 
  provided 
  with 
  several 
  

   longitudinal 
  furrows, 
  which 
  do 
  not 
  reach 
  the 
  posterior 
  

   margin. 
  Segments 
  x.-xiii. 
  are 
  biannulated. 
  

  

  Setas 
  more 
  crowded 
  in 
  the 
  ventral 
  than 
  in 
  the 
  dorsal 
  region, 
  

   particularly 
  towards 
  the 
  clitellum, 
  where 
  the 
  circles 
  of 
  setse 
  

   are 
  interrupted 
  in 
  the 
  middle 
  ventral 
  line 
  (aa 
  = 
  2 
  ab 
  } 
  

   ab 
  = 
  bc 
  = 
  cd 
  . 
  . 
  . 
  .), 
  but 
  the 
  interstice 
  is 
  wanting 
  at 
  the 
  

   dorsal 
  region 
  {zz=yz 
  = 
  xy 
  ....). 
  Somewhat 
  behind 
  the 
  

   clitellum 
  the 
  circles 
  of 
  setse 
  are 
  provided 
  with 
  two 
  middle 
  

   interstices 
  (aa 
  = 
  3 
  or 
  4 
  ab, 
  zz 
  = 
  3 
  or 
  4 
  yz). 
  

  

  There 
  is 
  no 
  great 
  difference 
  in 
  the 
  dimensions 
  of 
  the 
  setse 
  

   of 
  a 
  circle. 
  At 
  the 
  x. 
  segment 
  there 
  are 
  about 
  .1.80 
  setae, 
  and 
  

   in 
  the 
  middle 
  region 
  o£ 
  the 
  body 
  about 
  135 
  setas 
  on 
  each 
  

   segment. 
  

  

  Clitellum 
  saddle-shaped, 
  occupying 
  segments 
  xiv.-xviii., 
  

   unprovided 
  with 
  intersegmental 
  lurrows. 
  On 
  the 
  xiv. 
  

   and 
  xv. 
  segments 
  it 
  is 
  a 
  little 
  more 
  extended 
  than 
  on 
  the 
  

   following 
  segments 
  (PL 
  XIII. 
  fig. 
  8). 
  

  

  * 
  See 
  (i) 
  pp. 
  273, 
  274. 
  "The 
  worm 
  is 
  nricronephridie, 
  anteriorly 
  19 
  

   a 
  large 
  glandular 
  body, 
  which 
  is 
  probably 
  a 
  peptonephridium." 
  As 
  

   regards 
  the 
  term 
  " 
  peptonephridium," 
  consult 
  my 
  note 
  of 
  li'05 
  (2). 
  

  

  