﻿Rev. 
  A. 
  M. 
  Norman's 
  Notes 
  on 
  British 
  Amphipoda. 
  457 
  

  

  Distribution. 
  Floro, 
  Norway, 
  45-70 
  fathoms 
  (A. 
  M. 
  N.) 
  ; 
  

   South 
  and 
  West 
  Norway, 
  50-200 
  fathoms 
  [G. 
  0. 
  Sars); 
  

   West 
  Greenland, 
  25-215 
  fathoms 
  (//. 
  J. 
  Hansen). 
  

  

  There 
  are 
  several 
  closely 
  allied 
  species 
  of 
  Halimedon 
  found 
  

   in 
  Norway, 
  some 
  of 
  which 
  may 
  be 
  expected 
  to 
  occur 
  on 
  our 
  

   coast. 
  

  

  Genus 
  III. 
  AceroSj 
  A. 
  Boeck. 
  

  

  Head 
  truncate 
  in 
  front 
  and 
  without 
  any 
  rostrum. 
  "Eyes 
  

   not 
  united, 
  very 
  small, 
  situated 
  on 
  the 
  side 
  of 
  the 
  head 
  " 
  ('?). 
  

   Epimera 
  of 
  the 
  third 
  and 
  fourth 
  segments 
  of 
  perseon 
  smaller 
  

   than 
  in 
  the 
  preceding 
  genera. 
  Antennules 
  of 
  female 
  with 
  

   remarkably 
  long 
  peduncle 
  and 
  very 
  short 
  flagellum, 
  the 
  male 
  

   peduncle 
  very 
  short 
  and 
  flagellum 
  long. 
  Mouth-organs 
  

   similar 
  in 
  structure 
  to 
  those 
  of 
  the 
  family 
  ; 
  the 
  mandibular 
  

   palp 
  having 
  the 
  second 
  joint 
  curved, 
  but 
  not 
  so 
  strongly 
  as 
  in 
  

   Halimedon, 
  and 
  broader 
  ; 
  inner 
  lamina 
  of 
  first 
  maxillae 
  longer 
  

   than 
  usual, 
  with 
  three 
  apical 
  plumose 
  setaj. 
  Gnathopods 
  

   small, 
  in 
  general 
  structure 
  as 
  in 
  Halimedon, 
  but 
  the 
  wrist 
  

   furnished 
  with 
  a 
  longer 
  and 
  narrower 
  calx. 
  Perceopods, 
  first 
  

   and 
  second 
  pair 
  with 
  meros 
  long 
  and 
  broad 
  ; 
  finger 
  in 
  the 
  

   form 
  of 
  a 
  long, 
  flattened, 
  knife-like, 
  naked 
  blade 
  ; 
  third 
  and 
  

   fourth 
  pairs 
  short, 
  the 
  nail 
  of 
  similar 
  character 
  to 
  that 
  of 
  pre- 
  

   ceding 
  pairs 
  ; 
  fifth 
  pair 
  long 
  and 
  slender. 
  

  

  Aceros 
  jphyllonyx 
  (M. 
  Sars). 
  

  

  1858. 
  Leucothoe 
  phyllonyx, 
  M. 
  Sars, 
  Oversigt 
  over 
  Norsk-arct. 
  Krebs- 
  

   dyr, 
  Vid. 
  Selsk. 
  Forh. 
  p. 
  148. 
  

  

  1859. 
  (Ediceros 
  obtusas, 
  Bruzelius, 
  Skand. 
  Anipkip. 
  Gamin, 
  p. 
  02, 
  

   pi. 
  iv. 
  tig. 
  17, 
  2 
  • 
  

  

  1862. 
  (Ediceros 
  obtusus, 
  Bate, 
  Cat. 
  Amphip. 
  Crust. 
  Brit. 
  Mus. 
  p. 
  373. 
  

  

  1862. 
  Montagua 
  phyllonyx, 
  id. 
  ibid. 
  p. 
  369. 
  

  

  1865. 
  GEdiceros 
  obtusus, 
  Goes, 
  Crust. 
  Amphip. 
  maris 
  Spetsbergiam 
  

  

  alluentis, 
  p. 
  11, 
  pi. 
  xl. 
  fig. 
  24, 
  S 
  • 
  

   1870. 
  Aceros 
  phyllonyx, 
  A. 
  Boeck, 
  Crust. 
  Amphip. 
  bor. 
  et 
  arct. 
  p. 
  02. 
  

   1876. 
  Aceros 
  phyllonyx, 
  A. 
  Boeck, 
  De 
  Skand. 
  og 
  Arkt. 
  Amphip. 
  

  

  p. 
  302, 
  pi. 
  xiv. 
  fig. 
  7. 
  

   1875. 
  Aceros 
  phyllonyx, 
  Metzger, 
  Zool. 
  Ergebnisse 
  der 
  Nordseefahrt, 
  

  

  p. 
  282 
  (no 
  description). 
  

  

  1883. 
  Aceros 
  phyllonyx, 
  Schneider, 
  Af 
  Norges 
  kyster 
  forekom. 
  GZdice- 
  

   ridse, 
  p. 
  30, 
  pi. 
  iii. 
  fig. 
  18. 
  

  

  1884. 
  Aceros 
  phyllonyx, 
  Schneider, 
  Trornso 
  Museums, 
  Aarshefter, 
  vii. 
  

   p. 
  05. 
  

  

  1887. 
  Aceros 
  phyllonyx, 
  11. 
  J. 
  Hansen, 
  Overs, 
  over 
  det 
  vestlige 
  Gron- 
  

   lands 
  Fauna 
  af 
  Malakostrake 
  Havkrebsdyr, 
  117, 
  pi. 
  iv. 
  fig. 
  7. 
  

  

  Head 
  vertically 
  truncate, 
  without 
  the 
  slightest 
  rostrate 
  

   process. 
  Antennules 
  in 
  female 
  with 
  remarkably 
  long 
  pe- 
  

   duncle, 
  first 
  joint 
  long, 
  three 
  to 
  four 
  times 
  as 
  long 
  as 
  the 
  

  

  