﻿262 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  joints 
  of 
  the 
  chelipedes 
  have 
  three 
  or 
  four 
  granules 
  or 
  spinules 
  on 
  

   the 
  posterior, 
  but 
  none 
  on 
  the 
  anterior 
  margin, 
  and 
  the 
  pahn 
  is 
  

   without 
  either 
  granules 
  or 
  spinules 
  ; 
  the 
  ambulatory 
  legs 
  are 
  much 
  

   less 
  dilated 
  and 
  compressed 
  than 
  in 
  Mr. 
  Haswell's 
  figure*. 
  

  

  From 
  Parati/molus 
  puhescens 
  and 
  P. 
  hituhercidatus 
  this 
  form 
  is 
  

   distinguished 
  not 
  merely 
  by 
  the 
  different 
  shape 
  and 
  tuberculation 
  of 
  

   the 
  carapace, 
  but 
  also 
  by 
  the 
  shorter 
  eye-peduncles 
  and 
  second 
  

   antennal 
  joint, 
  aud 
  by 
  the 
  more 
  dilated 
  last 
  joint 
  of 
  the 
  peduncle 
  

   of 
  the 
  autenufe, 
  and 
  the 
  more 
  distinctly 
  operculiforra 
  maxillipedes, 
  

   which 
  are 
  altogether 
  of 
  the 
  Maioid 
  type, 
  with 
  nearly 
  quadrate 
  

   merus-joints 
  (see 
  fig. 
  h). 
  The 
  legs 
  also 
  are 
  more 
  robust. 
  Colour 
  

   (in 
  spirit) 
  light 
  yellowish 
  brown. 
  Length 
  of 
  carapace 
  of 
  an 
  adult 
  

   female 
  with 
  ova 
  nearly 
  3| 
  lines 
  (7 
  millim.), 
  greatest 
  breadth 
  nearly 
  

   3 
  lines 
  (6 
  millim.) 
  ; 
  length 
  of 
  chelipede 
  about 
  3| 
  lines 
  (7 
  miUim,), 
  of 
  

   second 
  ambulatory 
  leg 
  about 
  5 
  lines 
  (11 
  millim.). 
  

  

  Three 
  specimens 
  (females) 
  are 
  in 
  the 
  collection 
  from 
  Priday 
  Island, 
  

   10 
  fms. 
  (No. 
  153). 
  The 
  distinctions 
  between 
  the 
  two 
  forms 
  above 
  

   enumerated 
  are, 
  I 
  think, 
  too 
  marked 
  to 
  be 
  due 
  to 
  sex. 
  The 
  sex 
  of 
  

   Mr. 
  Haswell's 
  types 
  from 
  Port 
  Denison 
  and 
  Port 
  Jackson 
  is 
  not 
  

   stated, 
  but 
  the 
  figure 
  of 
  the 
  postabdomen 
  nearly 
  resembles 
  that 
  of 
  

   our 
  adult 
  female 
  P. 
  sexspinosus. 
  

  

  5. 
  Diogenes 
  rectimanus. 
  (Plate 
  XXYII. 
  fig. 
  C.) 
  

  

  The 
  carapace 
  is 
  depressed, 
  with 
  the 
  sides 
  in 
  front 
  of 
  the 
  branchial 
  

   regions 
  uneven 
  and 
  with 
  a 
  few 
  hairs 
  ; 
  the 
  lateral 
  margins 
  armed 
  

   with 
  three 
  or 
  four 
  spinules 
  ; 
  the 
  frontal 
  margin 
  broadly 
  sinuated, 
  

   with 
  scarcely 
  any 
  trace 
  of 
  a 
  median 
  prominence, 
  but 
  with 
  distiact 
  

   lateral 
  spinules, 
  situated 
  between 
  the 
  bases 
  of 
  the 
  eye-peduncles 
  and 
  

   antennae 
  : 
  the 
  branchial 
  regions 
  are 
  but 
  little 
  dilated 
  ; 
  the 
  rostral 
  

   scale 
  is 
  linear, 
  acute, 
  and 
  reaches 
  nearly 
  to 
  the 
  apices 
  of 
  the 
  oph- 
  

   thalmic 
  scales, 
  which 
  are 
  broadly 
  ovate, 
  with 
  three 
  or 
  four 
  minute 
  

   denticules 
  at 
  their 
  distal 
  ends. 
  The 
  postabdomen 
  is 
  clothed 
  with 
  

   longish 
  hairs, 
  and 
  has 
  four 
  filamentous 
  appendages 
  on 
  its 
  left 
  side, 
  

   its 
  fifth 
  and 
  sixth 
  segments 
  are 
  protected 
  by 
  dorsal 
  calcareous 
  plates 
  ; 
  

   the 
  terminal 
  segment 
  is 
  slightly 
  transverse, 
  divided 
  by 
  a 
  median 
  

   notch 
  into 
  two 
  rounded 
  lobes, 
  which 
  are 
  ciliated 
  aud 
  spinulose 
  on 
  

   the 
  margins. 
  The 
  eye-peduncles 
  are 
  nearly 
  as 
  long 
  as 
  the 
  transverse 
  

   width 
  of 
  the 
  frontal 
  margin 
  of 
  the 
  carapace, 
  much 
  shorter 
  than 
  the 
  

   antennal 
  peduncles, 
  with 
  the 
  cornese 
  not 
  dilated. 
  The 
  penultimate 
  

   joint 
  of 
  the 
  peduncle 
  of 
  the 
  slender 
  antennules 
  reaches 
  just 
  beyond 
  

   the 
  apex 
  of 
  the 
  eye-peduncles 
  ; 
  the 
  antepenultimate 
  joint 
  of 
  the 
  

   peduncle 
  of 
  the 
  antennae 
  is 
  prolonged 
  into 
  a 
  spine, 
  which 
  reaches 
  

   nearly 
  to 
  the 
  apex 
  of 
  the 
  following 
  joint 
  ; 
  this 
  spine 
  is 
  armed 
  on 
  its 
  

   inner 
  margin 
  with 
  a 
  series 
  of 
  sraaller 
  spinules, 
  and 
  there 
  is 
  a 
  smaller 
  

   spine 
  on 
  its 
  outer 
  side 
  at 
  base 
  ; 
  the 
  terminal 
  peduncular 
  joint 
  reaches 
  

   beyond 
  the 
  eye-peduncles 
  ; 
  the 
  joints 
  of 
  the 
  fiagella 
  are 
  friuged 
  

   below 
  with 
  long 
  flexible 
  hairs. 
  The 
  outer 
  and 
  lower 
  margin 
  of 
  the 
  

  

  * 
  Anu. 
  & 
  Mag. 
  Nat. 
  Hist. 
  ser. 
  5, 
  v. 
  p. 
  303, 
  pi. 
  xvi. 
  figs. 
  3-5 
  (1880). 
  

  

  