﻿382 
  Dr. 
  C. 
  Chilton 
  on 
  

  

  cularly 
  on 
  tlie 
  branching 
  holdfasts 
  of 
  Macrocystis. 
  This 
  

   rendered 
  necessary 
  also 
  an 
  examination 
  of 
  the 
  characters 
  of 
  

   the 
  other 
  species 
  of 
  Lhmioria 
  that 
  have 
  been 
  described 
  during- 
  

   recent 
  years, 
  and 
  has 
  led 
  to 
  one 
  or 
  two 
  results 
  which 
  are 
  

   perhaps 
  worthy 
  of 
  being 
  placed 
  on 
  record. 
  I 
  have 
  had 
  for 
  

   examination 
  numerous 
  specimens 
  of 
  L. 
  lignorum 
  and 
  of 
  

   L. 
  segnisj 
  and 
  I 
  have 
  also 
  been 
  able 
  to 
  examine 
  two 
  speci- 
  

   mens 
  from 
  the 
  South 
  Orkney 
  Islands 
  which 
  appear 
  to 
  belong 
  

   to 
  L. 
  antarctica, 
  PfefFer. 
  Tiiese 
  were 
  found 
  among 
  the 
  

   " 
  residues 
  " 
  of 
  some 
  Amphipodan 
  collections 
  made 
  by 
  the 
  

   'Scotia' 
  Expedition 
  in 
  1903, 
  and 
  were 
  presumably 
  taken 
  

   free, 
  /. 
  e. 
  not 
  boring 
  into 
  wood. 
  

  

  In 
  1904, 
  the 
  E,ev. 
  T. 
  R. 
  E. 
  Stebbing 
  (1901, 
  p. 
  714) 
  

   enumerated 
  four 
  species 
  known 
  at 
  that 
  time, 
  with 
  the 
  

   characters 
  that 
  appeared 
  to 
  distinguish 
  them. 
  Since 
  then 
  

   two 
  other 
  species 
  have 
  been 
  described, 
  making 
  six 
  species 
  in 
  

   all. 
  These 
  species 
  are 
  : 
  — 
  

  

  1. 
  Limnoria 
  Ugnorum 
  (Rathke), 
  1799. 
  Length 
  5 
  mm. 
  

  

  Wood-borer, 
  abundant 
  in 
  Europe 
  and 
  on 
  the 
  eastern 
  

   coast 
  of 
  North 
  America, 
  also 
  recorded 
  from 
  the 
  

   Pacific 
  and 
  from 
  San 
  Diego, 
  California. 
  

  

  2. 
  L. 
  segiiis, 
  Chilton, 
  1883. 
  Length 
  5 
  mm. 
  Species 
  

  

  living 
  on 
  seaweed 
  and 
  not 
  boiitig 
  into 
  wood, 
  Lyttelton 
  

   and 
  Akaroa 
  Harbours, 
  New 
  Zealand. 
  

  

  3. 
  L. 
  antarctica, 
  PfefFer, 
  1887. 
  Lengtli 
  4-5 
  mm. 
  Found 
  

  

  in 
  iioles 
  bored 
  in 
  seaweed, 
  South 
  Georgia; 
  also 
  taken 
  

   at 
  the 
  South 
  Orkneys. 
  

  

  4. 
  L. 
  pf'-ffuri, 
  Stebbing, 
  1904. 
  Length 
  3*5 
  mm. 
  Found 
  

  

  in 
  rotten 
  wood 
  in 
  lagoon, 
  Minikoi, 
  Indian 
  Ocean. 
  

  

  5. 
  L.^'opon/ca, 
  Richardson, 
  1909. 
  Length 
  5 
  mm. 
  Taken 
  

  

  from 
  crevices 
  in 
  water-logged 
  fragment 
  of 
  bamboo, 
  

   Japan. 
  

  

  6. 
  L. 
  andrewsi, 
  Caiman, 
  1910. 
  Length 
  about 
  2 
  mm. 
  

  

  Boring 
  in 
  piles, 
  Christmas 
  Island, 
  Indian 
  Ocean. 
  

  

  These 
  six 
  species 
  form 
  a 
  very 
  natural 
  group, 
  and 
  are 
  all 
  

   very 
  much 
  alike 
  in 
  size, 
  general 
  appearance, 
  and 
  in 
  the 
  

   general 
  form 
  and 
  structure 
  of 
  the 
  different 
  appendages. 
  

   They 
  seem 
  to 
  differ 
  mainly 
  in 
  the 
  proportions 
  of 
  some 
  of 
  the 
  

   mouth-parts 
  and 
  of 
  the 
  other 
  appendages. 
  The 
  chief 
  points 
  

   that 
  have 
  been 
  used 
  to 
  differentiate 
  them 
  are 
  the 
  shape 
  and 
  

   size 
  of 
  the 
  epipod 
  of 
  the 
  maxillipeds, 
  the 
  character 
  of 
  the 
  

   palp 
  of 
  the 
  mandible, 
  the 
  relative 
  size 
  of 
  the 
  rami 
  of 
  the 
  

   uropods 
  and 
  their 
  proportion 
  to 
  the 
  peduncle, 
  and 
  the 
  

   presence 
  or 
  absence 
  of 
  a 
  comb-like 
  spine 
  on 
  the 
  propod 
  of 
  

   the 
  first 
  gnathopod 
  ; 
  other 
  distinctions 
  have 
  in 
  certain 
  cases 
  

  

  