﻿Rev. 
  A. 
  M. 
  Norman's 
  Notes 
  on 
  British 
  Amphipoda, 
  449 
  

  

  tions. 
  These 
  sexual 
  distinctions 
  in 
  the 
  male 
  seem 
  to 
  hold 
  

   good 
  throughout 
  the 
  genus, 
  as 
  I 
  have 
  noticed 
  them 
  in 
  several 
  

   species. 
  The 
  last 
  peraeopods, 
  moreover, 
  instead 
  of 
  having 
  

   the 
  two 
  distal 
  joints 
  furnished 
  with 
  small 
  spinules 
  and 
  

   groups 
  of 
  3-5 
  and 
  of 
  single, 
  long, 
  spine-like 
  setae, 
  have 
  the 
  

   penultimate 
  joint 
  more 
  strongly 
  spined 
  and 
  the 
  last 
  more 
  

   slender, 
  the 
  spines 
  stronger, 
  and 
  the 
  setae 
  of 
  much 
  greater 
  

   length. 
  

  

  In 
  the 
  young 
  (May 
  Island) 
  the 
  antennae 
  are 
  less 
  strongly 
  

   spined 
  and 
  the 
  brush 
  of 
  setas 
  of 
  the 
  hand 
  of 
  peraeopod 
  much 
  

   less 
  developed 
  proportionately 
  than 
  in 
  the 
  adult. 
  

  

  Bate 
  and 
  Westwood's 
  figure 
  and 
  description 
  of 
  M. 
  carina- 
  

   tus 
  are 
  inexact 
  in 
  the 
  following 
  points 
  : 
  — 
  The 
  metacarpus 
  of 
  

   the 
  first 
  gnathopods 
  is 
  not 
  " 
  produced 
  interiorly 
  to 
  a 
  sharp 
  

   point," 
  but 
  is 
  obtusely 
  produced 
  and 
  furnished 
  with 
  numerous 
  

   divergent 
  seta? 
  at 
  the 
  extremity. 
  In 
  the 
  figure 
  the 
  lower 
  

   margin 
  of 
  the 
  last 
  joint 
  of 
  the 
  antenna} 
  is 
  represented 
  as 
  clothed 
  

   with 
  down, 
  which 
  is 
  not 
  the 
  case 
  in 
  the 
  female, 
  in 
  which 
  it 
  

   has 
  transverse 
  rows 
  of 
  spines, 
  and 
  although 
  the 
  male 
  has 
  such 
  

   down 
  (or 
  cilia) 
  it 
  is 
  on 
  the 
  upper, 
  not 
  lower, 
  margin. 
  The 
  

   last 
  joints 
  of 
  last 
  perasopods 
  are 
  also 
  drawn 
  too 
  setose 
  for 
  the 
  

   female, 
  though 
  the 
  last 
  joint 
  would 
  well 
  represent 
  that 
  part 
  of 
  

   the 
  male. 
  Judging 
  from 
  the 
  antennce, 
  however, 
  I 
  should 
  

   suppose 
  that 
  Bate 
  and 
  Westwood's 
  figure 
  was 
  taken 
  from 
  a 
  

   female. 
  

  

  Monoculodes 
  Stimpsoni 
  was 
  first 
  described 
  in 
  Cat. 
  Amphip. 
  

   Crust. 
  Brit. 
  Mus. 
  p. 
  105, 
  from 
  a 
  very 
  imperfect 
  specimen; 
  

   but, 
  in 
  Hist. 
  Brit. 
  Sessile-eyed 
  Crust., 
  Bate 
  and 
  Westwood 
  

   made 
  a 
  specimen 
  in 
  my 
  collection 
  their 
  type. 
  That 
  specimen 
  

   I 
  have 
  now 
  dissected 
  and 
  compared 
  carefully 
  with 
  M, 
  carina- 
  

   tus 
  } 
  to 
  which 
  it 
  is 
  undoubtedly 
  referable. 
  It 
  will 
  be 
  observed 
  

   that 
  their 
  figure 
  and 
  description 
  of 
  the 
  antennae 
  do 
  not 
  accord, 
  

   while 
  the 
  figure 
  and 
  description 
  of 
  the 
  second 
  gnathopods 
  are 
  

   altogether 
  wrong, 
  the 
  mistake 
  having 
  clearly 
  arisen 
  from 
  a 
  

   laterally 
  foreshortened 
  view 
  of 
  the 
  limb 
  in 
  the 
  undissected 
  

   animal. 
  The 
  numerous 
  short 
  joints 
  of 
  the 
  flagellum 
  of 
  the 
  

   antennas 
  show 
  it 
  to 
  be 
  an 
  immature 
  male 
  and 
  is 
  the 
  state 
  

   which 
  exactly 
  accords 
  with 
  M. 
  affinis, 
  Bruzelius. 
  

  

  Monoculodes 
  affinis 
  of 
  Goes, 
  however, 
  is 
  certainly 
  not 
  this 
  

   species, 
  and 
  he 
  appears, 
  moreover, 
  to 
  have 
  confused 
  two 
  

   species. 
  One 
  of 
  these 
  (Goes, 
  fig. 
  21') 
  Schneider 
  assigns 
  to 
  

   M. 
  horcalis 
  } 
  Boeck, 
  and 
  the 
  other 
  (Goes, 
  fig. 
  21) 
  with 
  doubt 
  

   to 
  M. 
  norvegicus 
  } 
  Boeck. 
  Hansen 
  agrees 
  as 
  to 
  the 
  former 
  

   allocation, 
  which 
  appears 
  to 
  me 
  also 
  to 
  be 
  correct, 
  but 
  would 
  

   refer 
  the 
  latter 
  to 
  M. 
  tuberculatus, 
  Boeck. 
  

  

  Hansen 
  (' 
  Malacostraca 
  marina 
  Grcenlandia; 
  occidentalis,' 
  

  

  