﻿232 
  Transactions. 
  — 
  Zoology. 
  

  

  Edriophthalmata. 
  

   Tribe 
  I. 
  — 
  Isopoda. 
  

   Sub-tribe 
  I. 
  Idoteidea. 
  Genus 
  Idotea. 
  

   Idotea 
  affinis, 
  Miers' 
  Cat., 
  p. 
  93, 
  

  

  In 
  the 
  description 
  given 
  of 
  this 
  species 
  the 
  flagehum 
  of 
  the 
  antennse 
  is 
  

   said 
  to 
  be 
  about 
  20-jointed, 
  and 
  the 
  lengtli 
  If 
  inch. 
  Tlie 
  species 
  is 
  said 
  

   also 
  to 
  "vary 
  shghtly 
  in 
  the 
  number 
  of 
  the 
  joints 
  of 
  the 
  external 
  antennae." 
  

   In 
  a 
  great 
  number 
  examined 
  by 
  me, 
  I 
  found 
  the 
  length 
  to 
  vary 
  from 
  1 
  

   inch 
  to 
  over 
  2\ 
  inches, 
  and 
  the 
  number 
  of 
  joints 
  in 
  the 
  flagellum 
  from 
  

   sixteen 
  up 
  to 
  thirty-two. 
  

  

  Sub-tribe 
  II. 
  Oniscoidea. 
  

   Fam. 
  II. 
  Oniscidge. 
  Miers' 
  Cat., 
  p, 
  98. 
  

   Sub-Fam. 
  I. 
  Oniscinse. 
  Genus 
  Oniscus. 
  

  

  3. 
  Oniscus 
  jmnctatus, 
  nov. 
  sp. 
  Fig. 
  A. 
  3. 
  

  

  Body 
  rather 
  convex, 
  oval, 
  minutely 
  granulated 
  over 
  the 
  entire 
  surface. 
  

   Head 
  short 
  and 
  broad 
  ; 
  eyes 
  small, 
  round 
  and 
  black. 
  Antenna 
  finely 
  

   hirsute, 
  fifth 
  joint 
  the 
  longest, 
  equalling 
  the 
  last 
  three. 
  First 
  segment 
  of 
  

   thorax 
  wider 
  than 
  those 
  succeeding 
  ; 
  last 
  segment 
  produced 
  acutely 
  back- 
  

   wards. 
  Abdomen 
  not 
  much 
  narrower 
  than 
  thorax, 
  but 
  falling 
  away 
  rather 
  

   abruptly; 
  two 
  anterior 
  segments 
  narrower 
  than 
  the 
  others, 
  and 
  not 
  pro- 
  

   duced 
  into 
  exserted 
  lateral 
  angles 
  ; 
  three 
  succeeding 
  segments 
  subequal, 
  

   with 
  their 
  latero-posterior 
  margins 
  acutely 
  produced; 
  last 
  segment 
  short 
  

   and 
  rounded. 
  Caudal 
  stylets 
  short, 
  external 
  branch 
  the 
  longest, 
  narrow- 
  

   cylindrical, 
  minutely 
  hirsute, 
  with 
  two 
  or 
  three 
  short 
  set® 
  at 
  the 
  extremities. 
  

  

  Colour 
  light 
  brown, 
  with 
  darker 
  markings. 
  Length 
  "3 
  inch. 
  

  

  Dunedin. 
  

  

  Sub-Fam. 
  III. 
  Ligiinse. 
  

  

  Genus 
  Ligia, 
  Miers' 
  Cat., 
  p. 
  103. 
  

  

  4. 
  Ligia 
  quadrata, 
  Hutton, 
  MS. 
  Cat. 
  Fig. 
  A.4. 
  

  

  Oval, 
  sub-depressed, 
  with 
  minute 
  granulations 
  on 
  the 
  back, 
  but 
  free 
  from 
  

   hairs. 
  Three 
  posterior 
  segments 
  of 
  thorax 
  acutely 
  prolonged 
  backwards 
  on 
  

   either 
  side. 
  Abdomen 
  considerably 
  narrower 
  than 
  thorax, 
  last 
  segment 
  

   sub-quadrate, 
  the 
  angles 
  hardly 
  projecting. 
  Outer 
  antenna 
  two-thirds 
  the 
  

   length 
  of 
  the 
  animal, 
  fourth 
  and 
  fifth 
  joints 
  much 
  the 
  longest; 
  flagellum 
  

   from 
  15-to 
  23-jointed, 
  minutely 
  setose. 
  Base 
  of 
  caudal 
  stylets 
  about 
  half 
  

   as 
  long 
  as 
  abdomen 
  ; 
  rami 
  slightly 
  unequal, 
  shorter 
  branch 
  with 
  a 
  long 
  

   slender 
  seta, 
  which 
  reaches 
  beyond 
  the 
  extremity 
  of 
  the 
  longer 
  branch. 
  

   Colour 
  yellowish-olivaceous 
  closely 
  speckled 
  with 
  black. 
  Length 
  '5 
  inch. 
  

  

  Dupedin, 
  

  

  This 
  species 
  lives 
  among 
  loose 
  stones 
  on 
  the 
  beach, 
  and 
  runs 
  with 
  great 
  

   rapidity. 
  

  

  