﻿526 
  COLLECTIONS 
  FROM 
  THE 
  -WESTERN 
  INDIAN 
  OCEAN. 
  

  

  posed 
  of 
  two 
  moderately 
  divergent 
  spines. 
  Orbits 
  deep, 
  tubular, 
  

   with 
  a 
  lateral 
  aspect, 
  and 
  with 
  two 
  nearlj* 
  closed 
  fissures 
  above. 
  

   Basal 
  antennal 
  joint 
  very 
  much 
  dilated, 
  with 
  a 
  small 
  distal 
  spine. 
  

   Chelipcdes 
  (in 
  the 
  male) 
  rather 
  small 
  and 
  slender, 
  fingers 
  nearly 
  

   straight. 
  Ambulatory 
  legs 
  slender, 
  not 
  spinose 
  or 
  nodose. 
  

  

  This 
  genus 
  must, 
  I 
  think, 
  be 
  associated 
  with 
  Pericera 
  in 
  the 
  

   family 
  Pcricerida;, 
  on 
  account 
  of 
  the 
  deep, 
  well-defined, 
  and 
  tubular 
  

   orbits, 
  notwithstanding 
  the 
  two 
  narrow 
  fissures 
  in 
  their 
  superior 
  

   margin. 
  It 
  is 
  further 
  distinguished 
  from 
  Pericera 
  by 
  the 
  deflexed 
  

   rostrum 
  and 
  the 
  absence 
  of 
  a 
  series 
  of 
  lateral 
  spines. 
  In 
  Prioro- 
  

   rhynclius 
  the 
  rostrum 
  is 
  deflexed, 
  but 
  lamellate 
  and 
  merely 
  notched 
  

   at 
  its 
  distal 
  extremity. 
  

  

  13. 
  Entomonyx 
  spinosus. 
  (Plate 
  XLVII. 
  fig. 
  B.) 
  

  

  The 
  carapace 
  is 
  moderately 
  convex, 
  subpyriform 
  ; 
  its 
  surface 
  un- 
  

   even 
  and 
  granulated, 
  with 
  two 
  spines 
  in 
  a 
  longitudinal 
  series 
  on 
  the 
  

   gastric, 
  two 
  in 
  a 
  transverse 
  series 
  on 
  the 
  cardiac, 
  and 
  two 
  on 
  the 
  

   branchial 
  regions 
  near 
  the 
  postero-lateral 
  margins. 
  The 
  spines 
  of 
  

   the 
  rostrum 
  are 
  rather 
  short, 
  moderately 
  divergent, 
  broadest 
  at 
  base, 
  

   and 
  distally 
  acute. 
  The 
  orbits 
  are 
  deep, 
  tubular, 
  project 
  somewhat 
  

   laterally, 
  and 
  are 
  bordered 
  with 
  short 
  spiniform 
  teeth 
  ; 
  in 
  the 
  upper 
  

   margin, 
  near 
  the 
  postocular 
  lobe 
  or 
  tooth, 
  are 
  two 
  narrow 
  fissures. 
  

   The 
  postabdomen 
  (in 
  the 
  male) 
  is 
  narrow, 
  with 
  the 
  segments 
  all 
  

   distinct, 
  the 
  first 
  the 
  shortest. 
  The 
  pterygostomian 
  regions 
  are 
  

   granulated. 
  The 
  basal 
  antennal 
  joint 
  is 
  granulated 
  and 
  very 
  much 
  

   enlarged, 
  and 
  has 
  a 
  short 
  spine 
  at 
  its 
  distal 
  extremity 
  beneath 
  the 
  

   base 
  of 
  the 
  next 
  joint, 
  besides 
  two 
  small 
  spines 
  which 
  are 
  situated 
  

   on 
  the 
  inferior 
  margin 
  of 
  the 
  orbit. 
  The 
  anterior 
  legs 
  or 
  chelipcdes 
  

   are 
  of 
  moderate 
  length 
  and 
  rather 
  slender; 
  merus-joint 
  or 
  arm 
  

   granulated, 
  and 
  with 
  a 
  scries 
  of 
  spines 
  on 
  the 
  upper 
  and 
  lower 
  sur- 
  

   faces 
  ; 
  the 
  wrist 
  and 
  palm 
  also 
  very 
  closely 
  granulated, 
  the 
  wrist 
  

   with 
  some 
  longer 
  tubercles 
  or 
  short 
  spines 
  on 
  its 
  outer 
  surface 
  near 
  

   base 
  ; 
  the 
  palm 
  rather 
  slender, 
  nearly 
  twice 
  as 
  long 
  as 
  the 
  wrist 
  ; 
  

   the 
  fingers 
  nearly 
  straight, 
  acute 
  at 
  their 
  apices, 
  and 
  regularly 
  den- 
  

   ticulated 
  along 
  their 
  inner 
  margins. 
  The 
  ambulatory 
  legs 
  are 
  very 
  

   slender, 
  and 
  decrease 
  regularly 
  in 
  length 
  from 
  the 
  first 
  to 
  the 
  last 
  ; 
  

   their 
  merus-joints 
  are 
  minutely 
  spinulose 
  above, 
  and 
  have 
  a 
  longer 
  

   spine 
  at 
  the 
  distal 
  extremity. 
  The 
  carapace 
  and 
  ambulatory 
  legs 
  are 
  

   clothed 
  with 
  short 
  curled 
  hairs, 
  which 
  are 
  longest 
  and 
  most 
  dense 
  

   at 
  the 
  base 
  of 
  the 
  rostrum. 
  Colour 
  (in 
  spirit) 
  pinkish. 
  Length 
  of 
  

   carapace 
  to 
  base 
  of 
  rostrum 
  nearly 
  5^ 
  lines 
  (11 
  millim.), 
  greatest 
  

   breadth 
  Ah 
  lines 
  (9*5 
  millim.) 
  ; 
  length 
  of 
  a 
  chelipede 
  about 
  | 
  inch 
  

   (13 
  millim?). 
  

  

  An 
  adult 
  female 
  and 
  small 
  male 
  were 
  collected 
  at 
  Providence 
  

   Reef, 
  24 
  fms. 
  (No. 
  215), 
  and 
  three 
  males 
  and 
  a 
  female 
  at 
  Providence 
  

   Island, 
  19 
  fms. 
  (No. 
  217). 
  

  

  The 
  rostrum 
  is 
  more 
  strongly 
  deflexed 
  in 
  the 
  females 
  than 
  in 
  the 
  

   males. 
  

  

  