﻿18 
  Mr. 
  R. 
  I. 
  Pocock 
  on 
  the 
  

  

  Xiphocaris 
  gladiator 
  , 
  sp. 
  n. 
  

  

  Carapace 
  wider 
  behind 
  than 
  in 
  front, 
  slightly 
  carinated 
  

   above 
  in 
  front, 
  the 
  carina 
  being 
  continued 
  on 
  to 
  the 
  rostrum 
  ; 
  

   proximal 
  half 
  of 
  rostrum 
  bent 
  gradually 
  slightly 
  downwards, 
  

   distal 
  half 
  bent 
  gradually 
  upwards, 
  but 
  not 
  beyond 
  the 
  

   plane 
  of 
  the 
  dorsum 
  of 
  the 
  cephalothorax 
  ; 
  rostrum 
  ex- 
  

   tending 
  slightly 
  beyond 
  the 
  antennular 
  peduncle, 
  but 
  not 
  so 
  

   far 
  as 
  the 
  apex 
  of 
  the 
  antennal 
  scale 
  ; 
  armed 
  above 
  proxi- 
  

   mally 
  with 
  from 
  12 
  to 
  18 
  minute 
  close-set 
  teeth 
  and 
  with 
  

   from 
  2 
  to 
  5 
  also 
  minute 
  and 
  close-set 
  teeth 
  immediately 
  before 
  

   the 
  apex, 
  and 
  below 
  distally 
  with 
  from 
  18 
  to 
  30 
  minute 
  

   close-set 
  teeth. 
  Eyes 
  prominent 
  and 
  pyriform. 
  Basal 
  

   segment 
  of 
  antennular 
  peduncle 
  furnished 
  with 
  a 
  spine, 
  which 
  

   is 
  about 
  equal 
  to 
  it 
  in 
  length 
  ; 
  second 
  segment 
  about 
  equal 
  to 
  

   the 
  first 
  in 
  length 
  and 
  distinctly 
  longer 
  than 
  the 
  third 
  ; 
  the 
  

   two 
  flagella 
  smooth, 
  slender, 
  long 
  (but 
  imperfect) 
  ; 
  peduncle 
  

   varying 
  in 
  length, 
  in 
  one 
  specimen 
  reaching 
  as 
  far 
  forwards 
  

   as 
  the 
  front 
  edge 
  of 
  the 
  antennal 
  scale, 
  in 
  two 
  others 
  falling 
  

   considerably 
  short 
  of 
  it. 
  Antennal 
  peduncle 
  unarmed 
  

   beneath 
  ; 
  scale 
  furnished 
  in 
  front 
  and 
  behind 
  with 
  a 
  fringe 
  of 
  

   hairs, 
  ovate 
  at 
  the 
  tip, 
  armed 
  with 
  a 
  spine 
  externally. 
  All 
  

   the 
  pereiopods, 
  sparsely 
  hirsute, 
  are 
  furnished 
  with 
  slender 
  

   exopods. 
  The 
  fii 
  st 
  pair 
  shorter 
  but 
  somewhat 
  stouter 
  than 
  the 
  

   second 
  ; 
  ischium 
  stouter 
  but 
  shorter 
  than 
  merus 
  ; 
  merus 
  cylin- 
  

   drical 
  ; 
  carpus 
  very 
  short, 
  narrower 
  behind 
  ; 
  propodus 
  slightly 
  

   compressed, 
  the 
  stoutest 
  segment 
  in 
  the 
  appendage, 
  its 
  dac- 
  

   tylar 
  prolongation 
  armed 
  apically 
  with 
  two 
  or 
  three 
  teeth, 
  

   which 
  meet 
  with 
  similar 
  teeth 
  on 
  the 
  apex 
  of 
  the 
  curved 
  dac- 
  

   tylus. 
  Second 
  pereiopod 
  resembling 
  the 
  first, 
  except 
  that 
  all 
  

   the 
  segments 
  are 
  longer 
  and 
  more 
  slender; 
  it 
  is 
  longer 
  

   than 
  the 
  first 
  by 
  its 
  three 
  distal 
  segments. 
  Remaining 
  

   pereiopods 
  almost 
  alike, 
  being 
  composed 
  of 
  long, 
  slender, 
  

   cylindrical 
  segments 
  ; 
  the 
  merus 
  of 
  each 
  is 
  furnished 
  distally 
  

   and 
  behind 
  with 
  a 
  single 
  strong 
  spine, 
  the 
  carpus 
  with 
  a 
  few 
  

   small 
  spines 
  and 
  a 
  distal 
  tooth-like 
  prolongation 
  above, 
  the 
  

   propodus 
  with 
  two 
  rows 
  of 
  small 
  spines 
  beneath 
  ; 
  the 
  dactylus 
  

   with 
  a 
  strong 
  claw, 
  and, 
  except 
  in 
  the 
  last, 
  three 
  or 
  four 
  

   strongish 
  spines 
  beneath 
  ; 
  the 
  dactylus 
  of 
  the 
  last 
  is 
  furnished 
  

   with 
  a 
  series 
  of 
  plume-like 
  hairs 
  beneath 
  on 
  its 
  posterior 
  

   margin. 
  In 
  these 
  appendages 
  the 
  carpus 
  is 
  equal 
  in 
  length 
  

   to 
  about 
  two 
  thirds 
  of 
  the 
  merus 
  and 
  to 
  half 
  of 
  the 
  propodus 
  

   and 
  dactylus 
  taken 
  together 
  ; 
  the 
  dactylus 
  is 
  about 
  half 
  the 
  

   length 
  of 
  the 
  carpus. 
  

  

  Branchiai 
  sixteen 
  on 
  each 
  side, 
  the 
  appendages 
  from 
  the 
  

   external 
  maxillipede 
  to 
  the 
  fouith 
  pereiopod 
  inclusive 
  being 
  

  

  