﻿CRUSTACEA. 
  289 
  

  

  y. 
  Alpheus 
  comatularum, 
  Haswell. 
  

  

  Since 
  Mr. 
  Haswell's 
  description 
  of 
  this 
  species 
  is 
  brief, 
  it 
  may 
  bo 
  

   of 
  service 
  to 
  subjoin 
  the 
  following, 
  which 
  was 
  drawn 
  up 
  before 
  his 
  

   Catalogue 
  came 
  to 
  hand 
  ; 
  — 
  

  

  The 
  body 
  is 
  smooth 
  ; 
  carapace 
  with 
  the 
  sides 
  nearly 
  straight 
  and 
  

   the 
  antero-lateral 
  angles 
  appearing 
  right 
  angles 
  in 
  a 
  dorsal 
  view. 
  

   The 
  rostrum 
  is 
  very 
  long, 
  reaching 
  nearly 
  to 
  the 
  end 
  of 
  the 
  peduncles 
  

   of 
  the 
  antennules, 
  vertically 
  compressed 
  and 
  acute 
  ; 
  it 
  has 
  a 
  dorsal 
  

   keel, 
  which 
  is 
  prolonged 
  backward 
  to 
  the 
  gastric 
  region 
  of 
  the 
  

   carapace, 
  which 
  is 
  rather 
  convex 
  ; 
  the 
  supraocular 
  spines 
  are 
  long 
  and 
  

   acute, 
  but 
  not 
  half 
  as 
  long 
  as 
  the 
  rostrum. 
  The 
  lateral 
  margins 
  of 
  

   the 
  second 
  to 
  sixth 
  segments 
  of 
  the 
  postabdomen 
  terminate 
  in 
  small 
  

   spines 
  in 
  the 
  males 
  ; 
  in 
  the 
  females 
  the 
  third 
  to 
  sixth 
  segments 
  are 
  

   laterally 
  acute 
  ; 
  in 
  the 
  males 
  the 
  first, 
  and 
  in 
  the 
  females 
  the 
  first 
  

   and 
  second 
  segments 
  have 
  their 
  lateral 
  margins 
  broadly 
  rounded. 
  

   The 
  terminal 
  segment 
  is 
  about 
  twice 
  as 
  long 
  as 
  broad, 
  with 
  four 
  

   spines 
  on 
  its 
  upper 
  surface 
  (two 
  on 
  either 
  side 
  of 
  the 
  middle 
  line) 
  

   and 
  four 
  at 
  its 
  distal 
  end 
  (two 
  on 
  either 
  side 
  of 
  a 
  slightly 
  prominent 
  

   median 
  lobe). 
  The 
  eyes 
  are 
  completely 
  concealed 
  beneath 
  the 
  cara- 
  

   pace 
  ; 
  the 
  penultimate 
  and 
  antepenultimate 
  joints 
  of 
  the 
  antennulary 
  

   peduncles 
  are 
  of 
  about 
  equal 
  length, 
  the 
  last 
  joint 
  a 
  little 
  shorter 
  ; 
  

   the 
  longer 
  of 
  the 
  two 
  flagella 
  is 
  about 
  as 
  long 
  as 
  the 
  carapace, 
  with 
  

   ciliated 
  joints 
  ; 
  outside 
  of 
  the 
  peduncles 
  is 
  a 
  flattened 
  spine, 
  which 
  

   reaches 
  to 
  the 
  middle 
  of 
  the 
  penultimate 
  peduncular 
  joint. 
  The 
  

   terminal 
  joint 
  of 
  the 
  peduncle 
  of 
  the 
  antennae 
  is 
  much 
  elongated, 
  

   the 
  preceding 
  joint 
  very 
  short; 
  the 
  flagella 
  robust 
  and 
  hardly 
  as 
  

   long 
  as 
  the 
  body 
  ; 
  the 
  basal 
  scale 
  is 
  shorter 
  than 
  the 
  peduncle, 
  bi- 
  

   partite 
  at 
  its 
  distal 
  end, 
  the 
  outer 
  lobe 
  spiuiform 
  and 
  acute 
  ; 
  there 
  

   is 
  a 
  small 
  external 
  basal 
  spine, 
  below 
  which 
  is 
  another 
  larger 
  spine. 
  

   The 
  larger 
  chelepide 
  (either 
  the 
  right 
  or 
  left) 
  has 
  a 
  slender 
  merus- 
  

   joint, 
  which 
  is 
  armed 
  with 
  a 
  small 
  spinule 
  at 
  the 
  distal 
  end 
  of 
  its 
  

   upper 
  margin 
  ; 
  the 
  carpus 
  (in 
  both) 
  is 
  extremely 
  short, 
  armed 
  above 
  

   and 
  below 
  with 
  a 
  strong 
  spine 
  ; 
  palm 
  subcylindrical, 
  elongated, 
  

   smooth, 
  without 
  notches, 
  rounded 
  above 
  and 
  below, 
  with 
  a 
  small 
  

   spiniile 
  at 
  the 
  distal 
  end 
  of 
  its 
  upper 
  margin 
  ; 
  fingers 
  each 
  with 
  a 
  

   blunt 
  rounded 
  tooth 
  on 
  its 
  inner 
  margin, 
  the 
  upper 
  dilated 
  laterally, 
  

   compressed 
  and 
  carinated 
  above. 
  In 
  the 
  smaller 
  chelipede 
  the 
  palm 
  

   is 
  slender, 
  the 
  fingers 
  incurved 
  at 
  the 
  tips, 
  the 
  dactyl 
  much 
  longer 
  

   than 
  the 
  lower 
  finger 
  and 
  strongly 
  arcuated. 
  In 
  the 
  second 
  legs 
  

   the 
  last 
  joint 
  of 
  the 
  carpus 
  is 
  slightly 
  longer 
  than 
  the 
  three 
  prece- 
  

   ding 
  joints 
  (which 
  are 
  very 
  short); 
  the 
  following 
  legs 
  are 
  mode- 
  

   rately 
  robust, 
  and 
  terminate 
  in 
  small 
  curved 
  claws. 
  The 
  rami 
  of 
  

   the 
  uropoda 
  are 
  rounded, 
  ciliated, 
  and 
  very 
  minutely 
  granulated 
  at 
  

   the 
  distal 
  ends, 
  the 
  outer 
  somewhat 
  the 
  larger 
  ; 
  their 
  basal 
  portions 
  

   are 
  armed 
  with 
  a 
  spine 
  above. 
  Colour 
  (in 
  spirit) 
  yellowish 
  or 
  

   pinkish 
  ; 
  an 
  adult 
  female 
  with 
  ova 
  is 
  a 
  deep 
  brown-pink. 
  Length 
  

   of 
  an 
  adult 
  female 
  nearly 
  ] 
  inch 
  iJ 
  lines 
  (30 
  millim.), 
  of 
  its 
  largo 
  

   chelipede 
  about 
  Og 
  lines 
  (20 
  millim.) 
  ; 
  the 
  males 
  are 
  somewhat 
  

   smaller. 
  

  

  