﻿280 
  \V. 
  BLAXLAND 
  BKNHAM. 
  

  

  both 
  in 
  the 
  South 
  IsUuid 
  of 
  New 
  Zealand, 
  'j'he 
  hauls 
  were 
  

   made 
  in 
  depths 
  from 
  150 
  to 
  1000 
  feet^ 
  but 
  I 
  have 
  no 
  

   information 
  as 
  to 
  whether 
  the 
  worms 
  came 
  fi'om 
  the 
  bottom, 
  

   though 
  this 
  is 
  probably 
  the 
  case. 
  

  

  PhREODRILUS 
  MAUIENSIS, 
  n. 
  sp. 
  

  

  Obtained 
  from 
  Lake 
  Taupo. 
  in 
  the 
  North 
  Island. 
  One 
  

   individual, 
  unfortunately 
  immature, 
  belongs 
  to 
  this 
  genus, 
  

   but 
  its 
  characters 
  are 
  just 
  sufficient 
  to 
  define 
  the 
  species. 
  It 
  

   is 
  evidently 
  distinct 
  from 
  P. 
  lacustris 
  and 
  from 
  P. 
  subter- 
  

   raneus. 
  

  

  The 
  length 
  is 
  18 
  mm., 
  its 
  breadth 
  | 
  mm.; 
  it 
  contains 
  seventy 
  

   segments, 
  and 
  is 
  thus 
  twice 
  as 
  stout 
  as 
  P. 
  lacustris, 
  but 
  

   not 
  nearly 
  as 
  large 
  as 
  P. 
  subterraneus. 
  

  

  The 
  prostomium 
  is 
  large 
  and 
  rounded. 
  

  

  The 
  dorsal 
  chsetae, 
  commencing 
  in 
  Segment 
  III, 
  are 
  capilli- 
  

   form 
  and 
  usually 
  solitary, 
  though 
  frequently 
  a 
  shorter 
  one 
  

   accompanies 
  the 
  larger. 
  

  

  The 
  ventral 
  chsetae 
  are 
  in 
  couples, 
  of 
  two 
  kinds 
  (PI. 
  14, 
  fig. 
  

   11), 
  a 
  is 
  simply 
  hooked 
  terminally, 
  while 
  b 
  has 
  a 
  distinct 
  but 
  

   small 
  tooth 
  on 
  its 
  upper 
  convex 
  curvature. 
  This 
  chasta 
  is 
  also 
  

   much 
  lai'ger 
  than 
  the 
  former. 
  The 
  tooth 
  is 
  much 
  more 
  evident 
  

   than 
  in 
  P. 
  lacustris, 
  and 
  the 
  chastse 
  are 
  altogether 
  of 
  larger 
  

   size, 
  being 
  0'135 
  mm. 
  in 
  length. 
  

  

  Of 
  internal 
  organs, 
  the 
  testes 
  are 
  present 
  in 
  Segment 
  XI, 
  

   and 
  small 
  ovaries 
  in 
  the 
  twelfth, 
  in 
  which 
  segment 
  there 
  is 
  

   also 
  the 
  early 
  rudiment 
  of 
  a 
  sperm-duct; 
  at 
  least, 
  so 
  I 
  

   interpret 
  a 
  longitudinal 
  cord 
  of 
  cells 
  lying 
  in 
  this 
  segment. 
  

  

  The 
  vascular 
  system 
  presents 
  a 
  feature 
  not 
  observed 
  in 
  

   P. 
  lacustris, 
  viz. 
  a 
  large 
  "heart 
  ^' 
  in 
  Segment 
  X, 
  and 
  a 
  

   somewhat 
  convoluted, 
  or 
  at 
  least 
  lobulated, 
  organ 
  in 
  XI, 
  

   which 
  appears 
  to 
  be 
  of 
  the 
  same 
  nature 
  as 
  the 
  " 
  blood- 
  

   gland 
  " 
  described 
  by 
  Beddard 
  in 
  Segments 
  XII, 
  XIII 
  of 
  

   P. 
  subterraneus. 
  This 
  specimen 
  Avas 
  stained 
  and 
  mounted, 
  

   and 
  I 
  have 
  not 
  studied 
  it 
  by 
  means 
  of 
  sections. 
  

  

  