﻿ON 
  A 
  NEW 
  SPECIES 
  OF 
  THE 
  GENUS 
  HAPLOTAXIS. 
  309 
  

  

  These 
  " 
  copulatory 
  glauds" 
  are 
  comparable 
  to 
  the 
  glands 
  

   of 
  several 
  Euchytrgeids.^ 
  

  

  There 
  are 
  two 
  pairs 
  of 
  globular 
  spermatliecae 
  (fig. 
  1) 
  filled 
  

   with 
  spermatozoa, 
  communicating 
  with 
  the 
  exterior 
  along 
  

   the 
  lateral 
  line. 
  Tliey 
  practically 
  fill 
  the 
  anterior 
  half 
  of 
  

   Segments 
  VIII 
  and 
  IX 
  ; 
  there 
  is 
  no 
  differentiated 
  duct, 
  but 
  the 
  

   epidermis 
  is 
  here 
  invaginated 
  to 
  pass 
  tlirough 
  the 
  muscles 
  

   and 
  reach 
  the 
  sac. 
  The 
  short 
  tube 
  thus 
  formed 
  is 
  lined 
  by 
  

   cuticle 
  ; 
  there 
  are 
  no 
  special 
  muscles 
  around 
  this 
  tube. 
  

  

  Dimensions. 
  — 
  About 
  20 
  mm. 
  by 
  4 
  mm; 
  about 
  sixty 
  

   segments. 
  (The 
  worm 
  was 
  not 
  measured 
  before 
  it 
  was 
  cut 
  

   in 
  pieces 
  for 
  sectionising, 
  but 
  the 
  portion 
  cut 
  longitudinally 
  

   measures 
  10 
  mm., 
  contains 
  twenty-three 
  segments; 
  and 
  the 
  

   uncut 
  remains 
  measures 
  8 
  mm., 
  contains 
  thirty-one 
  segments; 
  

   while 
  the 
  transverse 
  series 
  of 
  sections 
  involves 
  two 
  [?] 
  

   segments.) 
  

  

  Locality. 
  — 
  Lake 
  Wakatipu, 
  South 
  Island, 
  New 
  Zealand, 
  

   from 
  a 
  depth 
  of 
  550 
  feet. 
  

  

  Remarks. 
  

  

  The 
  new 
  worm 
  which 
  I 
  place 
  in 
  the 
  genus 
  Haplotaxis 
  

   differs 
  from 
  the 
  other 
  two 
  species 
  in 
  a 
  number 
  of 
  minor 
  

   points, 
  but 
  most 
  noticeably 
  in 
  the 
  possession 
  of 
  a 
  single 
  pair 
  

   of 
  ovaries 
  and 
  oviducts. 
  The 
  presence 
  of 
  a 
  second 
  pair 
  of 
  

   these 
  organs 
  has 
  hitherto 
  been 
  a 
  character 
  of 
  the 
  genus 
  

   which 
  therein 
  differs 
  from 
  all 
  other 
  Oligochtetes 
  except 
  the 
  

   Lumbriculidse. 
  But 
  apart 
  from 
  the 
  absence 
  of 
  the 
  second 
  

   pair 
  of 
  female 
  organs, 
  the 
  new 
  worm 
  agrees 
  in 
  all 
  other 
  

   points 
  with 
  the 
  generic 
  characters 
  as 
  given 
  by 
  Michaelsen 
  in 
  

   his 
  article 
  in 
  the 
  ' 
  Tierreich,' 
  in 
  the 
  more 
  detailed 
  papers 
  

   by 
  Beddard, 
  and 
  in 
  his 
  Monograph. 
  The 
  possession 
  of 
  

   two 
  pairs 
  of 
  sperm-ducts 
  opening 
  independently 
  is 
  another 
  

   character 
  of 
  the 
  genus, 
  which, 
  however, 
  is 
  shared 
  by 
  Pelo- 
  

   drilus. 
  The 
  latter 
  genus 
  was 
  founded 
  by 
  Beddard 
  (3) 
  for 
  a 
  

  

  ' 
  Forbes 
  describes 
  a 
  pair 
  of 
  glands, 
  of 
  similar 
  cLaracter 
  apparently, 
  in 
  every 
  

   sej^ment 
  of 
  tlie 
  body, 
  and 
  suggests 
  tliat 
  they 
  are 
  sensory. 
  

  

  