﻿560 
  On 
  Species 
  of 
  Amphi'poda. 
  

  

  low 
  lide 
  about 
  3 
  feet. 
  The 
  contents 
  of 
  the 
  bag 
  were 
  sent 
  to 
  

   me 
  for 
  examination, 
  and 
  were 
  found 
  to 
  contain 
  no 
  less 
  than 
  

   19 
  species 
  of 
  Amphipods. 
  Amona; 
  these 
  were 
  about 
  40 
  

   female 
  Corophium 
  bonelli, 
  M.-E., 
  3 
  female 
  C. 
  crassicorne, 
  

   and 
  3 
  males 
  — 
  of 
  which 
  species? 
  1 
  may 
  say 
  here 
  tiiat 
  I 
  take 
  

   G. 
  (). 
  Sars's 
  descriptions 
  and 
  figures 
  (i) 
  as 
  the 
  correct 
  repre- 
  

   sentations 
  of 
  these 
  species 
  as 
  far 
  as 
  they 
  go. 
  

  

  Now 
  there 
  is 
  a 
  mystery 
  about 
  the 
  male 
  of 
  C. 
  honeUii. 
  Gr. 
  0. 
  

   Sars 
  (i) 
  says 
  he 
  has 
  ''never 
  met 
  with 
  males 
  of 
  this 
  form." 
  

   Norman 
  (2) 
  says 
  that 
  "Among 
  some 
  hundreds 
  of 
  specimens 
  

   loosely 
  examined 
  there 
  were 
  none 
  which 
  at 
  a 
  glance 
  would 
  

   seem 
  to 
  be 
  males." 
  In 
  1879 
  Dr. 
  P. 
  P. 
  0. 
  Hoek 
  (3) 
  described 
  

   and 
  figured 
  the 
  antennte 
  of 
  a 
  male 
  and 
  female 
  Coi'ophhim 
  

   under 
  the 
  name 
  of 
  G. 
  crassicorne 
  — 
  presumably 
  they 
  were 
  

   taken 
  in 
  the 
  same 
  locality. 
  

  

  Now 
  a 
  comparison 
  of 
  these 
  figures 
  with 
  those 
  of 
  Corophium 
  

   acherusicum, 
  Costa^ 
  in 
  Delia 
  Valle's 
  ' 
  Gammaridea 
  of 
  the 
  

   Bay 
  of 
  Naples 
  ' 
  (pi. 
  viii. 
  figs. 
  24, 
  31, 
  &c.) 
  shows 
  that 
  they 
  

   are 
  identical 
  as 
  regards 
  the 
  female, 
  and, 
  as 
  far 
  as 
  can 
  be 
  

   judged 
  from 
  the 
  portion 
  of 
  the 
  lower 
  antenna 
  shown 
  by 
  

   Hoek, 
  probably 
  the 
  male 
  also. 
  This 
  identity 
  was 
  suggested 
  

   by 
  Stebbing 
  (5), 
  and 
  has 
  been 
  confirmed 
  by 
  an 
  examination 
  

   of 
  specimens 
  from 
  Bone, 
  Algeria, 
  kindly 
  sent 
  to 
  me 
  by 
  

   Mons. 
  E. 
  Clievreux 
  under 
  the 
  name 
  of 
  C. 
  acherus'cum, 
  

   Costa 
  (1857), 
  which, 
  therefore, 
  merges 
  in 
  the 
  older 
  name 
  of 
  

   C. 
  hondlii, 
  Milne-Edwards, 
  1830. 
  

  

  As 
  regards 
  C. 
  crassicorne, 
  Bruzelius, 
  while 
  the 
  female 
  

   lower 
  antennae 
  differ 
  entirely 
  from 
  those 
  of 
  C. 
  boneUii 
  (as 
  is 
  

   well 
  shown 
  by 
  Sars), 
  the 
  males 
  are 
  far 
  more 
  difficult 
  to 
  

   distinguish. 
  Chevreux 
  (6) 
  says 
  that 
  the 
  males 
  of 
  C. 
  acheru- 
  

   sicum 
  and 
  C. 
  crassicorne 
  are 
  difficult 
  to 
  distinguish 
  except 
  by 
  

   the 
  lateral 
  angles 
  of 
  the 
  head, 
  obtuse 
  and 
  crenate 
  at 
  the 
  

   extremity 
  in 
  tiie 
  former, 
  much 
  produced 
  and 
  acute 
  in 
  the 
  

   latter. 
  Unfortunately 
  this 
  feature 
  is 
  difficult 
  to 
  see, 
  and 
  as 
  

   the 
  two 
  s})ecies 
  are 
  found 
  associated 
  on 
  our 
  western 
  coasts 
  

   and 
  the 
  females 
  of 
  C. 
  hondlii 
  exceed 
  the 
  males 
  numerically 
  

   to 
  an 
  almost 
  incredible 
  degree, 
  it 
  is 
  no 
  wonder 
  that 
  the 
  latter 
  

   have 
  been 
  attributed 
  to 
  C. 
  crassicorne. 
  The 
  tooth 
  on 
  tiie 
  

   inner 
  side 
  of 
  the 
  third 
  joint 
  of 
  the 
  peduncle 
  of 
  the 
  lower 
  

   antennae 
  and 
  the 
  number 
  of 
  spines 
  on 
  the 
  first 
  joint 
  of 
  the 
  

   upper 
  antenna? 
  in 
  the 
  male, 
  which 
  in 
  1898 
  (7) 
  I 
  thought 
  

   distinctive, 
  appear 
  to 
  be 
  variable 
  characters. 
  

  

  To 
  the 
  synonymy 
  of 
  G. 
  boneUii 
  given 
  in 
  the 
  Gammaridea 
  

   of 
  ' 
  Das 
  Tierreich 
  ' 
  must 
  therefore 
  be 
  added 
  G. 
  acherusicum, 
  

   Costa, 
  and 
  C. 
  crassicorne, 
  Hoek. 
  My 
  G. 
  honnellii 
  in 
  Trans. 
  

   Linn. 
  Soc, 
  2nd 
  ser. 
  vol. 
  xii. 
  p. 
  343, 
  should 
  be 
  C. 
  honelUi, 
  

  

  