﻿316 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  segments 
  and 
  fourth 
  and 
  fifth 
  segments 
  exist 
  only 
  on 
  the 
  dorsal 
  

   surface, 
  but 
  on 
  the 
  third 
  extend 
  down 
  to 
  the 
  rounded 
  postero-lateral 
  

   angles 
  ; 
  in 
  the 
  second 
  segment 
  the 
  posterior 
  margin 
  above 
  the 
  

   rounded 
  postero-lateral 
  angles 
  is 
  obscurely 
  dentated. 
  The 
  lobes 
  of 
  

   the 
  terminal 
  segment 
  arc 
  subconical 
  and 
  tipped 
  with 
  one 
  or 
  two 
  

   setse. 
  The 
  eyes 
  are 
  oval, 
  but 
  very 
  obscurely 
  seen. 
  The 
  penulti- 
  

   mate 
  joint 
  of 
  the 
  peduncles 
  of 
  the 
  superior 
  antcnnaj 
  is 
  slightly 
  longer 
  

   and 
  slenderer 
  than 
  the 
  preceding 
  ; 
  the 
  third 
  joint, 
  with 
  which 
  the 
  

   short 
  accessory 
  flagellum 
  is 
  articulated, 
  is 
  verj- 
  short 
  ; 
  the 
  flagella 
  

   are 
  themselves 
  imperfect 
  ; 
  the 
  accessory 
  flagella 
  about 
  6-jointed. 
  

   Tbe 
  inferior 
  antennae 
  are 
  much 
  shorter 
  than 
  the 
  superior 
  ; 
  the 
  first 
  

   peduncular 
  joint 
  little 
  more 
  than 
  half 
  as 
  long 
  as 
  the 
  second, 
  which 
  

   is 
  about 
  as 
  long 
  as 
  the 
  third; 
  the 
  flagella 
  12-14-jointed. 
  The 
  first 
  

   legs 
  are 
  slender 
  and 
  feeble 
  ; 
  the 
  merus-joints 
  very 
  small, 
  with 
  pos- 
  

   terior 
  acute 
  lobe 
  and 
  tooth 
  ; 
  the 
  carpus 
  resembles 
  the 
  propus 
  or 
  

   palm, 
  having 
  the 
  posterior 
  margin 
  convex, 
  rounded, 
  and 
  hairy; 
  the 
  

   dactyl 
  is 
  a 
  little 
  more 
  than 
  half 
  as 
  long 
  as 
  the 
  palm. 
  The 
  second 
  

   legs 
  have 
  the 
  carpus 
  very 
  short, 
  propus 
  considerably 
  enlarged, 
  longer 
  

   than 
  broad, 
  its 
  distal 
  margin 
  oblique, 
  slightly 
  arcuated, 
  and 
  defined 
  

   by 
  a 
  small 
  tooth 
  ; 
  dactyl 
  slightly 
  arcuated, 
  and 
  closing 
  against 
  the 
  

   distal 
  margin 
  of 
  the 
  propus. 
  The 
  three 
  posterior 
  legs 
  are 
  slender 
  ; 
  

   the 
  margins 
  of 
  the 
  fourth 
  to 
  sixth 
  joints 
  with 
  a 
  few 
  stiff 
  hairs. 
  

   The 
  uropoda 
  are 
  biramose, 
  the 
  rami 
  in 
  the 
  penultimate 
  and 
  ante- 
  

   penultimate 
  pairs 
  subequal 
  ; 
  the 
  last 
  pair 
  are 
  wanting 
  in 
  the 
  three 
  

   specimens 
  I 
  have 
  examined. 
  

  

  Another 
  specimen 
  from 
  Port 
  Jackson, 
  0-5 
  fms., 
  which 
  I 
  refer 
  

   doubtfully 
  to 
  this 
  genus 
  (it 
  having 
  lost 
  the 
  head), 
  and 
  which 
  I 
  can- 
  

   not 
  identify 
  with 
  any 
  known 
  Si^iecies, 
  has 
  the 
  body 
  smooth 
  and 
  un- 
  

   armed, 
  the 
  first 
  three 
  postabdominal 
  segments 
  with 
  a 
  small 
  spinule 
  

   at 
  their 
  postero-lateral 
  angles 
  ; 
  the 
  terminal 
  segment 
  has 
  the 
  lobes 
  

   flattened 
  and 
  subacute 
  distally. 
  The 
  first 
  legs 
  are 
  small, 
  with 
  the 
  

   carpus 
  and 
  propus 
  posteriorly 
  arcuated, 
  the 
  carpus 
  little 
  shorter 
  

   than 
  the 
  propus. 
  The 
  second 
  legs 
  have 
  the 
  merus-joint 
  short, 
  but 
  

   little 
  produced 
  at 
  its 
  postero-distal 
  angle 
  ; 
  carpus 
  transverse, 
  dilated 
  

   in 
  its 
  distal 
  half, 
  which 
  equals 
  the 
  width 
  of 
  the 
  palm 
  at 
  base 
  ; 
  palm 
  

   longer 
  than 
  broad, 
  narrower 
  distally, 
  with 
  the 
  distal 
  margin 
  very 
  

   oblique, 
  not 
  acute, 
  but 
  presenting 
  a 
  broad 
  surface, 
  against 
  which 
  

   the 
  strong 
  arcuate 
  dactyl 
  closes, 
  and 
  armed 
  with 
  four 
  spines 
  or 
  lobes 
  

   as 
  follows 
  — 
  one 
  defining 
  the 
  postero-distal 
  angle, 
  a 
  pair 
  of 
  small 
  

   spines 
  in 
  front 
  of 
  this, 
  and 
  a 
  rounded 
  lobe 
  below 
  the 
  articulation 
  of 
  

   the 
  palm 
  with 
  the 
  dactyl. 
  The 
  three 
  posterior 
  legs 
  are 
  rather 
  

   robust, 
  with 
  the 
  basus-joints 
  not 
  serrated 
  ; 
  the 
  merus 
  produced 
  at 
  its 
  

   anterior 
  and 
  distal 
  angle. 
  The 
  outer 
  ramus 
  of 
  the 
  penultimate 
  and 
  

   antepenultimate 
  uropoda 
  is 
  slightly 
  shorter 
  than 
  the 
  inner 
  ramus 
  ; 
  

   the 
  rami 
  of 
  the 
  last 
  pair 
  subequal, 
  broader 
  and 
  slightly 
  shorter 
  than 
  

   the 
  preceding. 
  

  

  This 
  species, 
  which 
  may 
  be 
  designated 
  provisionally 
  M. 
  crassimana, 
  

   is 
  apparently 
  well 
  distinguished 
  by 
  the 
  form 
  and 
  dentition 
  of 
  the 
  

   palms 
  of 
  the 
  second 
  pair 
  of 
  legs. 
  

  

  There 
  is 
  also 
  in 
  the 
  collection 
  a 
  specimen 
  which 
  may 
  belong 
  to 
  

  

  