﻿CRUSTACEA. 
  293 
  

  

  above 
  the 
  scale 
  of 
  the 
  external 
  antennae, 
  which 
  is 
  armed 
  with 
  a 
  

   spinule 
  at 
  its 
  autero-external 
  angle. 
  This 
  I 
  propose 
  to 
  designate 
  

   H, 
  spinuliferus. 
  

  

  13. 
  Anchistia 
  petitthouarsi, 
  Audouin 
  ? 
  

  

  The 
  carapace, 
  with 
  its 
  rostrum, 
  is 
  shaped 
  nearly 
  as 
  in 
  Palcnmon 
  ; 
  

   the 
  terminal 
  postabdominal 
  segment 
  is 
  narrow, 
  with 
  four 
  spines 
  on 
  

   its 
  upper 
  surface, 
  placed 
  close 
  to 
  the 
  lateral 
  margins, 
  and 
  terminates 
  

   in 
  two 
  long 
  mobile 
  spines 
  and 
  three 
  smaller 
  spines. 
  There 
  is 
  a 
  

   supraorbital 
  spinule 
  situated 
  on 
  each 
  side 
  of 
  the 
  rostrum, 
  between 
  

   it 
  and 
  the 
  eyes 
  and 
  just 
  behind 
  the 
  anterior 
  margin 
  of 
  the 
  carapace, 
  

   also 
  an 
  antennal 
  spine 
  outside 
  of 
  the 
  eyes, 
  and 
  one 
  (the 
  branchio- 
  

   stegal 
  ?) 
  placed 
  below 
  the 
  eyes 
  and 
  behind 
  the 
  anterior 
  margin. 
  

   The 
  rostrum 
  is 
  longer 
  than 
  the 
  peduncles 
  of 
  the 
  antcnna3, 
  nearly 
  

   straight, 
  has 
  six 
  teeth 
  on 
  its 
  upper 
  and 
  four 
  on 
  its 
  lower 
  margin, 
  

   and 
  is 
  bidentate 
  at 
  apex 
  ; 
  the 
  last 
  tooth 
  of 
  the 
  series 
  is 
  situated 
  in 
  

   the 
  median 
  dorsal 
  line 
  of 
  the 
  carapace 
  behind 
  the 
  auterior 
  margin. 
  

   The 
  eyes 
  are, 
  as 
  in 
  Leander, 
  of 
  moderate 
  size 
  and 
  project 
  laterally. 
  

   The 
  antennules 
  have 
  the 
  antepenultimate 
  (?) 
  joint 
  of 
  the 
  peduncles 
  

   dilated, 
  laminate, 
  and 
  vertically 
  compressed, 
  with 
  a 
  small 
  spinule 
  

   at 
  its 
  antero-external 
  angle 
  ; 
  the 
  two 
  following 
  joints 
  are 
  short 
  and 
  

   slender 
  and 
  terminate 
  in 
  two 
  flagella, 
  of 
  which 
  the 
  thicker 
  is 
  shortly 
  

   bifid 
  at 
  its 
  apex, 
  the 
  other 
  is 
  broken. 
  The 
  antennal 
  scale 
  is 
  much 
  

   elongated, 
  narrow, 
  nearly 
  reaching 
  to 
  the 
  apex 
  of 
  the 
  thicker 
  an- 
  

   tennulary 
  flagellum, 
  and 
  completely 
  concealing 
  (in 
  a 
  dorsal 
  view) 
  

   the 
  peduncles 
  of 
  the 
  antennae 
  ; 
  it 
  is 
  ciliated 
  on 
  its 
  inner 
  margin 
  and 
  

   at 
  its 
  apex, 
  and 
  has 
  a 
  spinule 
  at 
  its 
  antero-internal 
  angle 
  ; 
  the 
  an- 
  

   tennal 
  flagellum 
  is 
  about 
  as 
  long 
  as 
  the 
  animal. 
  Tlie 
  outer 
  maxil- 
  

   lipcdes 
  are 
  subpediform, 
  with 
  the 
  antepenultimate 
  but 
  little 
  thicker 
  

   than 
  the 
  last 
  two 
  joints, 
  the 
  penultimate 
  longer 
  than 
  the 
  last 
  joint. 
  

   The 
  anterior 
  legs 
  (or 
  chelipedes) 
  arc 
  very 
  slender, 
  with 
  the 
  wrist 
  as 
  

   long 
  as 
  the 
  palm 
  and 
  fingers 
  together 
  ; 
  the 
  second 
  legs 
  are 
  slender, 
  

   but 
  thicker 
  than 
  the 
  preceding 
  ; 
  morus-joiut 
  with 
  a 
  small 
  spine 
  at 
  

   the 
  distal 
  end 
  of 
  its 
  inferior 
  margin 
  ; 
  the 
  wrist, 
  which 
  is 
  little 
  

   longer 
  than 
  the 
  palm, 
  is 
  also 
  armed 
  with 
  a 
  spine 
  at 
  its 
  distal 
  ex- 
  

   tremity 
  ; 
  the 
  palm 
  is 
  very 
  slender, 
  nearly 
  terete, 
  and 
  about 
  as 
  long 
  

   as 
  the 
  fingers 
  ; 
  these 
  latter 
  are 
  without 
  teeth 
  on 
  the 
  inner 
  margins, 
  

   and 
  have 
  the 
  tips 
  slightly 
  incurved. 
  The 
  ambulatory 
  legs 
  are 
  

   slender 
  and 
  clothed 
  with 
  a 
  few 
  distant 
  hairs 
  ; 
  the 
  penultimate 
  

   joints 
  very 
  long; 
  the 
  dactyli 
  slender, 
  styliform, 
  nearly 
  straight, 
  and 
  

   not 
  half 
  a's 
  long 
  as 
  the 
  preceding 
  joints. 
  The 
  bases 
  of 
  the 
  ui^opoda 
  

   have 
  a 
  small 
  spinule 
  at 
  the 
  distal 
  end 
  of 
  the 
  outer 
  margin, 
  and 
  there 
  

   are 
  two 
  subterminal 
  spinules 
  on 
  the 
  outer 
  margin 
  of 
  each 
  outer 
  

   ramus 
  ; 
  the 
  rami 
  are 
  subovate 
  (as 
  usual) 
  and 
  ciliated 
  at 
  the 
  distal 
  

   extremity 
  and 
  along 
  the 
  inner 
  margins 
  ; 
  the 
  outer 
  somewhat 
  broader 
  

   than 
  the" 
  inner 
  ramus. 
  Colour 
  (in 
  spiritj 
  whitish. 
  Length 
  nearly 
  

   10 
  lines 
  (21 
  milbm.). 
  

  

  The 
  unique 
  specimen 
  (a 
  female 
  with 
  ova) 
  was 
  obtained 
  at 
  Port 
  

   Mollo 
  ou 
  the 
  beach 
  (No. 
  98). 
  

  

  