﻿Oligochceta 
  of 
  Travancore. 
  497 
  

  

  the 
  other 
  species 
  of 
  the 
  same 
  genus 
  by 
  the 
  position 
  of 
  the 
  

   male 
  and 
  spermathecal 
  pores, 
  number 
  and 
  position 
  of 
  the 
  

   gizzards, 
  and 
  shape 
  of 
  prostates. 
  

  

  Fam. 
  Megascolecidae. 
  

  

  Subfam. 
  Megascolecinm. 
  

  

  Plutellus 
  timidus, 
  sp. 
  n. 
  (Pi. 
  XIII. 
  fig. 
  4.) 
  

  

  Five 
  mature 
  specimens 
  are 
  in 
  the 
  collection. 
  

  

  External 
  characters. 
  — 
  Length 
  30-48 
  mm., 
  thickness 
  about 
  

   1 
  mm.; 
  segments 
  nearly 
  constant 
  in 
  number, 
  viz. 
  116-liy. 
  

  

  Colour 
  violaceous 
  grey, 
  at 
  the 
  clitellum 
  brown 
  violaceous. 
  

  

  Head 
  epilobous, 
  prostomium 
  small. 
  The 
  body 
  is 
  a 
  little 
  

   compressed 
  behind 
  the 
  clitellum, 
  except 
  the 
  tail. 
  

  

  Setae 
  paired 
  all 
  along. 
  The 
  dorsal 
  bundles 
  are 
  beyond 
  the 
  

   lateral 
  lines. 
  About 
  at 
  the 
  x. 
  segment 
  aa 
  = 
  ^ 
  ab, 
  a6 
  = 
  | 
  be, 
  

   bc 
  = 
  cd, 
  cd 
  somewhat 
  smaller 
  than 
  dd, 
  dd 
  a 
  little 
  larger 
  than 
  

   ^ 
  of 
  the 
  whole 
  circumference. 
  The 
  middle 
  lateral 
  distances 
  

   increase 
  in 
  amplitude 
  behind 
  the 
  clitellum, 
  whilst 
  the 
  

   middle 
  dorsal 
  distance 
  is 
  gradually 
  reduced. 
  At 
  the 
  middle 
  

   region 
  of 
  the 
  body 
  «« 
  = 
  § 
  ab, 
  ab 
  = 
  ^ 
  be, 
  cd 
  = 
  ^ 
  be, 
  dd=cd. 
  

   At 
  the 
  tail 
  aa 
  = 
  ab 
  = 
  \ 
  be, 
  dd=cd==^ 
  be. 
  

  

  First 
  dorsal 
  pore 
  at 
  the 
  intersegmental 
  furrow 
  xi.-xii. 
  

   (?x.-xi.). 
  _ 
  

  

  Nephridial 
  pore?, 
  at 
  least 
  before 
  the 
  clitellum, 
  nearly 
  in 
  

   the 
  lines 
  of 
  the 
  setae 
  b. 
  Clitellum 
  developed 
  all 
  round 
  the 
  

   body, 
  and 
  occupying 
  segments 
  xiv.— 
  xvii. 
  The 
  interseg- 
  

   mental 
  furrows 
  xiv.-xv., 
  xv.-xvi., 
  and 
  xvi.-xvii. 
  are 
  neaily 
  

   obliterated. 
  

  

  Male 
  pores 
  on 
  small 
  papillae 
  on 
  the 
  xviii. 
  segment, 
  about 
  

   equally 
  distant 
  from 
  the 
  two 
  bundles 
  of 
  setae. 
  A 
  second 
  pair 
  

   of 
  papillae 
  on 
  the 
  xix. 
  segment, 
  close 
  laterally 
  to 
  the 
  ventral 
  

   setae 
  b. 
  These 
  papillae 
  are 
  prolonged 
  forwards 
  and 
  obliquely, 
  

   and 
  they 
  are 
  connected 
  on 
  each 
  side 
  with 
  the 
  anterior 
  papilla 
  

   (PI. 
  XIII. 
  fig. 
  4). 
  

  

  Female 
  pores 
  on 
  the 
  xiv. 
  segment, 
  a 
  little 
  forwards 
  and 
  

   internally 
  to 
  the 
  first 
  ventral 
  setae 
  (a). 
  These 
  pores 
  are 
  

   situated 
  in 
  a 
  small 
  transverse-oval 
  area, 
  which 
  is 
  rather 
  more 
  

   distinct 
  than 
  the 
  clitellum 
  (PI. 
  XIII. 
  fig. 
  4). 
  

  

  A 
  pair 
  of 
  spermathecal 
  pores 
  on 
  the 
  viii. 
  segment, 
  in 
  the 
  

   zone 
  of 
  the 
  seta 
  1 
  , 
  between 
  the 
  lines 
  of 
  setae 
  b 
  and 
  c. 
  

  

  Internal 
  anatomy. 
  — 
  First 
  septum 
  v.-vi. 
  very 
  thin 
  ; 
  septa 
  

   vii.-viii. 
  — 
  xii.— 
  xiii. 
  thickened. 
  A 
  not 
  very 
  strong 
  gizzard 
  

   in 
  the 
  v. 
  segment. 
  Intestine 
  without 
  typhlosole. 
  

  

  Nephridial 
  system 
  meganephric. 
  

   Ann. 
  & 
  Mag. 
  N. 
  Hist. 
  Ser. 
  8. 
  Vol 
  vii. 
  33 
  

  

  