﻿G. 
  M. 
  Thomson. 
  — 
  New 
  Zealand 
  Crustacea. 
  231 
  

  

  I 
  would 
  here 
  desire 
  to 
  express 
  my 
  thanks 
  to 
  Professor 
  Hutton 
  for 
  the 
  

   great 
  assistance 
  he 
  has 
  given 
  me, 
  and 
  particuhxrly 
  for 
  handing 
  over 
  for 
  my 
  

   inspection 
  the 
  collection 
  of 
  Crustacea 
  in 
  the 
  Otago 
  Museum, 
  together 
  with 
  

   his 
  own 
  valuable 
  notes 
  and 
  manuscript 
  descriptions. 
  

   Decapoda 
  macroura. 
  

   Sub-tribe 
  Caridea. 
  Fain. 
  I. 
  Crangonidae. 
  

   Crangon, 
  Fabricius. 
  

   Internal 
  antennae 
  dilated 
  at 
  the 
  base, 
  the 
  peduncle 
  short, 
  and 
  terminated 
  

   by 
  two 
  filaments. 
  External 
  maxillipeds 
  pediform, 
  the 
  terminal 
  joint 
  obtuse 
  

   and 
  flattened. 
  Anterior 
  legs 
  sub-didactyle, 
  stronger 
  and 
  thicker 
  than 
  the 
  

   others 
  ; 
  the 
  hand 
  flattened, 
  the 
  moveable 
  finger 
  inflexed 
  upon 
  the 
  hand, 
  and 
  

   meeting 
  a 
  rudimentary 
  thumb 
  ; 
  second 
  and 
  third 
  pairs 
  very 
  slender, 
  the 
  

   second 
  didactyle 
  ; 
  two 
  last 
  pairs 
  shorter 
  and 
  thicker. 
  Abdomen 
  large 
  and 
  

   rounded. 
  

  

  1. 
  Crangon 
  aiistralis, 
  Hutton, 
  MS. 
  Cat. 
  Fig. 
  A.l. 
  

  

  Carapace 
  with 
  five 
  longitudinal 
  rows 
  of 
  spines, 
  the 
  outer 
  with 
  three 
  from 
  

   the 
  base 
  of 
  the 
  moveable 
  plate, 
  the 
  next 
  with 
  five 
  from 
  the 
  outer 
  margin 
  of 
  

   the 
  orbit, 
  and 
  the 
  median 
  with 
  two. 
  Moveable 
  plate 
  extending 
  beyond 
  the 
  

   peduncle 
  of 
  the 
  outer 
  antenna. 
  Inner 
  antennae 
  short, 
  hardly 
  passing 
  the 
  

   external 
  maxillipeds. 
  Anterior 
  legs 
  extending 
  beyond 
  the 
  tip 
  of 
  the 
  move- 
  

   able 
  plate 
  ; 
  second 
  pair 
  about 
  half 
  the 
  length 
  of 
  the 
  first 
  ; 
  the 
  thu'd 
  much 
  

   longer. 
  Abdomen 
  smooth, 
  not 
  keeled, 
  suddenly 
  contracted 
  at 
  the 
  second 
  

   and 
  thkd 
  segments 
  from 
  the 
  end, 
  posterior 
  segment 
  nearly 
  cylindrical. 
  

   Length 
  1^ 
  inches. 
  Common. 
  

  

  Cook 
  Straits, 
  Dunedin, 
  and 
  Stewart 
  Island. 
  (Allied 
  to 
  C. 
  spinosus, 
  of 
  

  

  Britain). 
  

  

  Palgemon. 
  

  

  Sub-genus 
  Leander, 
  Jlfiers' 
  Cat., 
  p. 
  85. 
  

  

  2. 
  Leander 
  fluviatilis, 
  nov. 
  sp. 
  Fig. 
  A. 
  2. 
  

  

  Palcevion 
  fluviatilis, 
  Hutton, 
  MS. 
  Cat. 
  

  

  Beak 
  narrow, 
  slender, 
  nearly 
  straight, 
  with 
  from 
  nine 
  to 
  fifteen 
  teeth 
  

   on 
  the 
  upper 
  margin, 
  which 
  are 
  more 
  or 
  less 
  separated 
  into 
  three 
  groups, 
  

   the 
  posterior 
  of 
  which 
  consists 
  of 
  two, 
  or 
  rarely 
  three, 
  situated 
  behind 
  the 
  

   orbit 
  ; 
  the 
  middle 
  of 
  four 
  to 
  six, 
  in 
  front 
  of 
  the 
  orbit 
  ; 
  and 
  the 
  anterior 
  of 
  

   three 
  to 
  six, 
  much 
  smaller 
  and 
  situated 
  near 
  the 
  apex 
  ; 
  four 
  to 
  six 
  teeth 
  on 
  

   the 
  lower 
  margin. 
  Anterior 
  margin 
  of 
  carapace 
  with 
  one 
  spine, 
  and 
  another 
  

   over 
  the 
  inner 
  angle 
  of 
  the 
  orbit. 
  Anterior 
  feet 
  short, 
  but 
  rather 
  stout, 
  

   reaching 
  to 
  the 
  end 
  of 
  the 
  peduncle 
  of 
  the 
  outer 
  antennae 
  ; 
  second 
  pan- 
  very 
  

   slender, 
  longer, 
  but 
  not 
  reaching 
  to 
  the 
  tip 
  of 
  the 
  moveable 
  plate. 
  Length 
  

   1^ 
  inch. 
  

  

  Waikato 
  Eiver 
  (Professor 
  F. 
  W. 
  Hutton) 
  ; 
  Taieri 
  Eiver, 
  and 
  lagoons 
  in 
  

   Taieri 
  plain. 
  

  

  