﻿668 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [64] 
  

  

  region 
  intermediate 
  between 
  the 
  surface 
  and 
  the 
  bottom, 
  such 
  a 
  one 
  as 
  

   might 
  occasionally 
  stray 
  to 
  the 
  surface 
  or 
  to 
  considerable 
  depths. 
  There 
  

   is 
  nothing 
  in 
  the 
  structure 
  of 
  this 
  species 
  or 
  of 
  A. 
  eximea 
  to 
  render 
  this 
  

   supposition 
  improbable; 
  in 
  the 
  two 
  next 
  following 
  species, 
  however, 
  

   the 
  structure 
  of 
  the 
  eyes 
  makes 
  it 
  extremely 
  improbable 
  that 
  they 
  ever 
  

   approach 
  the 
  surface. 
  

  

  ACANTHEPHYRA 
  MIC 
  KOPHTH 
  ALMA 
  Smith. 
  

   Proc. 
  National 
  Mns., 
  vii, 
  p. 
  502,1885. 
  

  

  (Plate 
  XIII, 
  Fig. 
  3.) 
  

  

  Station 
  2224, 
  September 
  8, 
  north 
  lat. 
  36° 
  16' 
  30", 
  west 
  long. 
  C8° 
  21/, 
  

   2,574 
  fathoms, 
  globigerina 
  ooze, 
  temperature 
  37°; 
  two 
  males 
  and 
  two 
  

   females 
  (8584). 
  

  

  Also 
  taken 
  in 
  1885, 
  station 
  2566, 
  August 
  29, 
  north 
  lat. 
  37° 
  23', 
  west 
  

   long. 
  63° 
  8', 
  2,620 
  fathoms, 
  gray 
  ooze, 
  temperature 
  37° 
  ; 
  one 
  male 
  and 
  

   two 
  females 
  (10831). 
  

  

  This 
  species 
  differs 
  remarkably 
  in 
  general 
  appearance 
  from 
  those 
  

   previously 
  described, 
  but 
  agrees 
  with 
  them 
  in 
  all 
  important 
  generic 
  

   characters. 
  The 
  rudimentary 
  character 
  of 
  the 
  eyes 
  would 
  seem 
  to 
  in- 
  

   dictate 
  that 
  this, 
  at 
  least, 
  is 
  a 
  true 
  deep-water 
  species. 
  

  

  The 
  carapax 
  is 
  scarcely 
  as 
  broad 
  in 
  front 
  as 
  at 
  the 
  middle 
  of 
  the 
  

   branchial 
  region, 
  and 
  is 
  neither 
  compressed 
  nor 
  carinated'dorsally, 
  but 
  

   broadly 
  rounded, 
  except 
  at 
  the 
  high 
  and 
  laterally 
  compressed 
  base 
  of 
  

   the 
  very 
  slender 
  rostrum, 
  which 
  is 
  strongly 
  upturned, 
  wholly 
  unarmed 
  

   above 
  except 
  by 
  three 
  very 
  obscure 
  teeth 
  above 
  the 
  orbit, 
  and 
  armed 
  

   beneath 
  with 
  a 
  series 
  of 
  about 
  seven 
  small 
  and 
  nearly 
  equidistant 
  

   teeth 
  on 
  the 
  distal 
  two-thirds 
  of 
  the 
  length, 
  but 
  not 
  quite 
  reaching 
  the 
  

   very 
  slender 
  and 
  acute 
  tip. 
  The 
  orbital 
  sinus 
  is 
  much 
  smaller 
  than 
  in 
  

   A. 
  Agassizii, 
  the 
  lobe 
  beneath 
  is 
  much 
  broader 
  and 
  somewhat 
  truncated, 
  

   and 
  the 
  antennal 
  and 
  branchiostegal 
  spines 
  are 
  less 
  prominent. 
  

  

  The 
  eye-stalks 
  are 
  much 
  shorter 
  than 
  in 
  A. 
  Agassizii, 
  strongly 
  tapered 
  

   from 
  near 
  the 
  base 
  to 
  the 
  minute 
  brownish 
  eyes, 
  which 
  are 
  placed 
  ob- 
  

   liquely 
  upon 
  the 
  outer 
  side 
  of 
  the 
  tip 
  of 
  the 
  stalk. 
  

  

  The 
  proximal 
  segment 
  of 
  the 
  peduncle 
  of 
  the 
  antennula 
  is 
  less 
  deeply 
  

   excavated 
  for 
  the 
  reception 
  of 
  the 
  eye 
  than 
  in 
  A. 
  Agassizii, 
  and 
  the 
  ex- 
  

   panded 
  proximal 
  portion 
  of 
  the 
  outer 
  flagelliim 
  is 
  a 
  little 
  narrower, 
  but 
  

   otherwise 
  the 
  antennula 
  is 
  as 
  in 
  that 
  species. 
  

  

  The 
  antennal 
  scale 
  is 
  about 
  two-thirds 
  as 
  long 
  as 
  the 
  carapax 
  exclud- 
  

   ing 
  the 
  rostrum, 
  near 
  the 
  base 
  about 
  a 
  fourth 
  as 
  broad 
  as 
  long, 
  and 
  

   narrowed 
  to 
  a 
  truncated 
  tip 
  about 
  a 
  third 
  as 
  broad 
  as 
  the 
  base. 
  The 
  

   spine 
  upon 
  the 
  second 
  segment 
  of 
  the 
  peduncle 
  below 
  the 
  articulation 
  

   of 
  the 
  scale 
  is 
  much 
  shorter 
  than 
  in 
  A. 
  Agassizii. 
  

  

  The 
  oral 
  appendages 
  differ 
  only 
  slightly 
  from 
  those 
  of 
  A. 
  Agassizii. 
  

   The 
  mandibles 
  are 
  thicker 
  and 
  heavier, 
  the 
  opposing 
  edges 
  of 
  the 
  ven- 
  

  

  