﻿Crustacean 
  Goius: 
  Sicyonella, 
  Bovradaile. 
  259 
  

  

  lobe. 
  It 
  now 
  seems 
  highly 
  probable, 
  however, 
  that 
  the 
  

   Torres 
  Straits 
  specimen 
  is 
  immature^. 
  Its 
  length, 
  20 
  mm., 
  

   is 
  less 
  by 
  some 
  5 
  mm. 
  than 
  that 
  of 
  the 
  smallest 
  male 
  from 
  

   the 
  Indian 
  Ocean, 
  and 
  it 
  resembles 
  the 
  females 
  and 
  differs 
  

   from 
  the 
  males 
  in 
  having 
  (1) 
  the 
  eyes 
  less 
  dilated, 
  (2) 
  the 
  

   third 
  cheliped 
  less 
  slender 
  and 
  with 
  shorter 
  carpus, 
  and 
  (3) 
  

   the 
  inner 
  ilagcllum 
  of 
  the 
  antennnles 
  only 
  slightly 
  thickened 
  

   at 
  the 
  base 
  ; 
  in 
  the 
  males, 
  the 
  basal 
  part 
  is 
  considerably 
  

  

  A 
  B 
  

  

  Sicyoiiella 
  maldioensis, 
  aditlt 
  male 
  (co-type). 
  A. 
  Pelasnia, 
  seen 
  from 
  

   iu 
  front. 
  B. 
  Apical 
  portion 
  of 
  same, 
  from 
  behind. 
  

  

  thickened 
  and 
  excavated 
  on 
  the 
  inner 
  and 
  upper 
  side, 
  wliere 
  

   it 
  bears 
  a 
  row 
  of 
  strong 
  spines. 
  The 
  differences 
  in 
  tlie 
  pro- 
  

   portions 
  of 
  the 
  eyes 
  and 
  third 
  chelipeds 
  are 
  shown 
  by 
  the 
  

   following 
  measurements 
  (in 
  millimetres) 
  : 
  — 
  

  

  Indian 
  Ocean. 
  Torres 
  Straits. 
  

  

  6- 
  2- 
  d. 
  

  

  Total 
  length 
  30 
  29 
  20 
  

  

  ' 
  Ocular 
  peduncle 
  • 
  

  

  Diameter 
  at 
  base 
  •45 
  '48 
  -34 
  

  

  Diam. 
  of 
  corneal 
  area 
  .... 
  1'12 
  "76 
  "56 
  

   Tliird 
  cheliped 
  : 
  

  

  Carpus, 
  length 
  3-2 
  2 
  88 
  2-24 
  

  

  Propodus, 
  length 
  2-2 
  2-08 
  1-6 
  

  

  „ 
  diameter 
  -13 
  -18 
  -JO 
  

  

  Dactylus, 
  length 
  -52 
  -08 
  -48 
  

  

  While 
  it 
  is 
  thus 
  fairly 
  clear 
  that 
  Aphareocaris 
  elegans 
  

   must 
  be 
  I'egarded 
  as 
  a 
  synonym 
  of 
  Sicyonella 
  maldivensis, 
  it 
  

   is 
  to 
  be 
  noted 
  also 
  that 
  the 
  distinctions 
  which 
  1 
  pointed 
  out 
  

  

  * 
  The 
  changes 
  in 
  the 
  petasma 
  of 
  Scrgestos 
  during 
  growth 
  have 
  recently 
  

   been 
  described 
  by 
  Stephensen 
  [''The 
  Copulatory 
  Organ 
  (Petasma) 
  of 
  

   ISergedes 
  vigihix 
  (Stimpson), 
  II. 
  J. 
  H,," 
  Mindeskrift 
  lor 
  Japetus 
  Steen^ 
  

   strup, 
  K^benhavn, 
  1913, 
  pp. 
  1-5 
  (sep. 
  copy)]. 
  

  

  