﻿674 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [70] 
  

  

  cula 
  along 
  the 
  sides 
  of 
  the 
  carapax. 
  The 
  single 
  species 
  is 
  further 
  dis- 
  

   tinguished 
  by 
  the 
  unarmed 
  rostrum, 
  the 
  nou-carinated 
  pleon, 
  and 
  the 
  

   broad 
  anterior 
  division 
  of 
  the 
  distal 
  segment 
  of 
  the 
  protognath 
  of 
  the 
  

   second 
  maxilla. 
  In 
  all 
  other 
  characters 
  it 
  agrees 
  essentially 
  with 
  the 
  

   species 
  of 
  Acanthephyra. 
  

  

  Ephyrina 
  Benedicti 
  Smith. 
  

  

  Proc. 
  National 
  Mus., 
  vii, 
  p. 
  506, 
  1885. 
  

  

  (Plate 
  XIV, 
  Fig. 
  3, 
  Plate 
  XVI, 
  Fig. 
  4.) 
  

  

  Station 
  2083, 
  September 
  5, 
  1883, 
  north 
  lat. 
  40° 
  26' 
  40", 
  west 
  long. 
  

   67° 
  5' 
  15", 
  059 
  fathoms, 
  gray 
  mud, 
  temperature 
  40°; 
  one 
  female 
  (7156). 
  

  

  In 
  general 
  the 
  form 
  of 
  the 
  carapax 
  proper 
  is 
  very 
  similar 
  to 
  that 
  of 
  

   Acanthephyra 
  Agassizii, 
  but 
  the 
  antennal 
  and 
  branchiostegal 
  spines 
  are 
  

   less 
  prominent. 
  An 
  obtuse 
  dorsal 
  carina 
  extends 
  forward 
  from 
  near 
  

   the 
  posterior 
  margin 
  and 
  gradually 
  rises 
  in 
  front 
  into 
  a 
  very 
  high 
  and 
  

   sharp 
  carina 
  at 
  the 
  base 
  of 
  the 
  laterally 
  compressed 
  lamellar 
  rostrum, 
  

   which 
  is 
  short, 
  not 
  reaching 
  beyond 
  the 
  peduncle 
  of 
  the 
  antennula, 
  

   acutely 
  triangular 
  in 
  a 
  side 
  view, 
  considerably 
  upturned, 
  and 
  wholly 
  

   unarmed. 
  

  

  As 
  in 
  Acanthephyra 
  Agassizii, 
  the 
  eye-stalks 
  are 
  short 
  and 
  terminated 
  

   by 
  small 
  hemispherical 
  black 
  eyes, 
  which 
  face 
  slightly 
  inward 
  when 
  the 
  

   stalks 
  are 
  directed 
  forward. 
  

  

  Theantennulre, 
  too, 
  are 
  very 
  nearly 
  as 
  in 
  Acanthephyra 
  Agassizii, 
  except 
  

   that 
  the 
  proximal 
  portion 
  of 
  the 
  outer 
  flagellum 
  is 
  much 
  less 
  expanded, 
  

   though 
  very 
  much 
  stouter 
  than 
  the 
  inner. 
  The 
  antennal 
  scales 
  are 
  im- 
  

   perfect 
  at 
  the 
  tips, 
  but 
  are 
  less 
  rapidly 
  narrowed 
  distally, 
  and 
  are 
  ap- 
  

   parently 
  more 
  nearly 
  as 
  in 
  Acanthephyra 
  microphthalma. 
  

  

  The 
  mandibles 
  are 
  essentially 
  as 
  in 
  Acanthephyra 
  Agassizii, 
  but 
  are 
  

   very 
  nearly 
  alike 
  on 
  the 
  two 
  sides, 
  the 
  posterior 
  part 
  of 
  the 
  mesial 
  edge 
  

   of 
  the 
  ventral 
  process 
  in 
  each 
  being 
  armed 
  with 
  six 
  or 
  seven 
  acutely 
  

   triangular 
  teeth, 
  in 
  front 
  of 
  which 
  the 
  margin 
  is 
  sharp 
  and 
  chitenous. 
  

   but 
  not 
  serrated, 
  though 
  there 
  is 
  a 
  small 
  tooth 
  at 
  the 
  anterior 
  end 
  of 
  

   this 
  unserrated 
  edge 
  in 
  the 
  right 
  mandible 
  and 
  a 
  sharp 
  angle 
  at 
  the 
  

   same 
  point 
  in 
  the 
  left. 
  The 
  first 
  maxilla? 
  are 
  very 
  like 
  those 
  of 
  Acan- 
  

   thephyra 
  Agassizii. 
  The 
  anterior 
  division 
  of 
  the 
  distal 
  segment 
  of 
  the 
  

   protognath 
  of 
  the 
  second 
  maxilla 
  is 
  much 
  expanded 
  at 
  the 
  mesial 
  edge, 
  

   where 
  it 
  projects 
  farther 
  forward 
  and 
  is 
  more 
  than 
  twice 
  as 
  broad 
  as 
  

   the 
  posterior 
  division 
  ; 
  the 
  endoguath 
  is 
  more 
  slender 
  ; 
  the 
  anterior 
  lobe 
  

   of 
  the 
  scaphognath 
  is 
  a 
  little 
  narrower 
  and 
  more 
  evenly 
  rounded 
  at 
  the 
  

   end. 
  The 
  maxillipeds 
  do 
  not 
  differ 
  from 
  those 
  of 
  A. 
  Agassizii, 
  except 
  

   that 
  the 
  autero-mesial 
  angle 
  of 
  the 
  exopod 
  is 
  a 
  little 
  more 
  obtusely 
  

   rounded 
  ; 
  nor 
  do 
  the 
  first 
  gnathopods, 
  except 
  the 
  distal 
  part 
  of 
  theeudopod, 
  

   which 
  is 
  more 
  nearly 
  as 
  in 
  Acanthephyra 
  gracilis, 
  the 
  dactylus 
  being 
  

   longer 
  than 
  broad 
  and 
  terminally 
  attached 
  to 
  thepropodus 
  by 
  a 
  slightly 
  

   oblique 
  articulation. 
  The 
  second 
  gnathopods 
  are 
  imperfect 
  at 
  the 
  tips, 
  

  

  