﻿646 
  KEPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [42] 
  

  

  Female. 
  — 
  The 
  carapax 
  is 
  very 
  broad 
  and 
  the 
  lateral 
  margins 
  nearly 
  

   parallel. 
  The 
  front 
  is 
  gradually 
  narrowed 
  from 
  between 
  the 
  bases 
  

   of 
  the 
  peduncles 
  of 
  the 
  antennae 
  into 
  a 
  very 
  broad, 
  stout, 
  triangular, 
  

   and 
  nearly 
  horizontal 
  rostrum 
  about 
  half 
  as 
  long 
  as 
  the 
  greatest 
  

   breadth 
  of 
  the 
  carapax, 
  and 
  over 
  the 
  bases 
  of 
  the 
  ocular 
  spines 
  fully 
  

   half 
  as 
  broad 
  as 
  long. 
  The 
  rostrum 
  is 
  flat 
  or 
  very 
  slightly 
  concave, 
  

   and 
  nearly 
  smooth 
  beneath, 
  but 
  the 
  dorsal 
  side 
  has 
  a 
  strong 
  median 
  

   carina, 
  and 
  is 
  roughened 
  with 
  small 
  tubercles 
  ; 
  the 
  sharp 
  lateral 
  edges 
  

   are 
  armed 
  with 
  a 
  few 
  minute 
  teeth. 
  There 
  is 
  a 
  prominent 
  acutely 
  

   triangular 
  spine 
  on 
  the 
  anterior 
  margin 
  over 
  the 
  base 
  of 
  the 
  antenna 
  

   each 
  side, 
  and 
  outside 
  of 
  this 
  a 
  conical 
  spine 
  directed 
  forward 
  from 
  the 
  

   angle 
  of 
  the 
  small 
  hepatic 
  region, 
  which 
  really 
  forms 
  the 
  anterolateral 
  

   angle 
  of 
  the 
  carapax, 
  though 
  the 
  anterior 
  lobe 
  of 
  the 
  branchial 
  region 
  

   expands 
  laterally 
  much 
  beyond 
  the 
  hepatic 
  region, 
  and 
  is 
  armed 
  at 
  its 
  

   anterior 
  angle 
  with 
  a 
  great 
  dentiform 
  spine, 
  back 
  of 
  which 
  there 
  are 
  

   several 
  smaller 
  spines 
  on 
  the 
  lateral 
  margin 
  of 
  this 
  lobe 
  and 
  a 
  single 
  

   small 
  one 
  at 
  the 
  anterior 
  angle 
  of 
  the 
  posterior 
  branchial 
  lobe. 
  The 
  

   gastric 
  region 
  is 
  prominent, 
  and 
  armed 
  in 
  front 
  with 
  a 
  pair 
  of 
  sharp 
  

   conical 
  spines, 
  and 
  back 
  and 
  outside 
  of 
  these 
  with 
  many 
  smaller 
  spines 
  

   and 
  tubercles, 
  as 
  are 
  also 
  the 
  anterior 
  branchial 
  lobes, 
  and 
  the 
  extreme 
  

   anterior 
  portions 
  of 
  the 
  branchial 
  and 
  cardiac 
  regions. 
  The 
  cervical 
  

   suture 
  and 
  the 
  suture 
  between 
  the 
  anterior 
  and 
  posterior 
  lobes 
  of 
  the 
  

   branchial 
  region 
  are 
  marked 
  by 
  smooth 
  grooves, 
  of 
  which 
  the 
  gastro- 
  

   cardiac 
  portion 
  of 
  the 
  cervical 
  is 
  the 
  most 
  conspicuous. 
  The 
  whole 
  pos- 
  

   terior 
  part 
  of 
  the 
  cardiac 
  and 
  branchial 
  regions 
  is 
  armed 
  with 
  sharply 
  

   crenulated, 
  transverse, 
  and 
  brokeu 
  rugae 
  with 
  smooth 
  spaces 
  between, 
  

   and 
  a 
  broader 
  smooth 
  space 
  along 
  the 
  posterior 
  margin, 
  which 
  is 
  armed 
  

   with 
  a 
  high 
  double 
  crest, 
  the 
  edges 
  of 
  which 
  are 
  sharply 
  crenulated. 
  

  

  The 
  eye-stalks 
  are 
  short, 
  broad, 
  and 
  somewhat 
  cuboidal 
  in 
  form, 
  are 
  

   capable 
  of 
  very 
  little 
  motion, 
  bear 
  the 
  rather 
  small 
  hemispherical 
  white 
  

   eye 
  partially 
  embedded 
  at 
  the 
  end, 
  which 
  projects 
  on 
  the 
  dorso-mesial 
  

   side 
  in 
  a 
  slender 
  spine 
  longer 
  than 
  the 
  diameter 
  of 
  the 
  cornea, 
  and 
  are 
  

   armed 
  with 
  a 
  much 
  smaller 
  spine 
  on 
  the 
  outer 
  edge 
  just 
  back 
  of 
  the 
  eye, 
  

   and 
  with 
  a 
  very 
  small 
  spine 
  or 
  tubercle 
  similarly 
  situated 
  on 
  the 
  lower 
  

   mesial 
  angle. 
  

  

  The 
  stout 
  first 
  segment 
  of 
  the 
  peduncle 
  of 
  the 
  antennula 
  is 
  armed 
  

   distally 
  with 
  two 
  long 
  spines 
  on 
  the 
  outer 
  side, 
  and 
  beneath 
  with 
  a 
  

   short, 
  somewhat 
  truncated 
  and 
  minutely 
  dentate 
  process. 
  The 
  sec- 
  

   ond 
  segment 
  of 
  the 
  peduncle 
  of 
  the 
  antenna 
  is 
  armed 
  with 
  a 
  denti- 
  

   form 
  process 
  below 
  and 
  a 
  sharp 
  tooth 
  on 
  the 
  outer 
  side 
  ; 
  the 
  third 
  seg- 
  

   ment 
  is 
  armed 
  with 
  a 
  single 
  large 
  distal 
  spine 
  on 
  the 
  outside; 
  the 
  fourth 
  

   and 
  fifth 
  segments 
  are 
  only 
  inconspicuously 
  armed. 
  The 
  flagellum 
  is 
  

   slightly 
  compressed, 
  more 
  than 
  twice 
  as 
  long 
  as 
  the 
  carapax, 
  and 
  

   sparsely 
  clothed 
  with 
  slender 
  setae. 
  

  

  The 
  infero-mesial 
  edge 
  of 
  the 
  merus 
  of 
  the 
  second 
  gnathopod 
  is 
  armed 
  

   with 
  three 
  conical 
  spines. 
  

  

  