﻿451 
  Rev. 
  A. 
  M. 
  Norman's 
  Notes 
  on 
  British 
  Ampliipoda. 
  

  

  posteally, 
  both 
  margins 
  with 
  small 
  cilia, 
  the 
  hinder 
  margin 
  

   also 
  crenated, 
  the 
  last 
  four 
  joints 
  all 
  greatly 
  produced 
  and 
  

   each 
  longer 
  than 
  the 
  basos, 
  the 
  whole 
  limb 
  very 
  long. 
  

   Length 
  5 
  millim. 
  

  

  A 
  single 
  specimen 
  from 
  St. 
  Magnus 
  Bay, 
  Shetland, 
  in 
  30- 
  

   60 
  fathoms 
  (1867). 
  

  

  The 
  above 
  is 
  the 
  description 
  given 
  by 
  me 
  in 
  the 
  ' 
  Shetland 
  

   Dredging 
  Report/ 
  The 
  specimen, 
  which 
  was 
  mounted, 
  is 
  

   not 
  now 
  in 
  good 
  condition, 
  the 
  antennae., 
  antennules, 
  and 
  ros- 
  

   trum 
  having 
  a 
  good 
  deal 
  shrunk 
  and 
  the 
  gnathopods 
  being 
  

   somewhat 
  iolded. 
  For 
  this 
  reason 
  the 
  figures 
  given 
  of 
  the 
  

   gnathopods 
  are 
  probably 
  not 
  so 
  exactly 
  correct 
  as 
  regards 
  

   the 
  carpus 
  as 
  could 
  be 
  desired 
  ; 
  but 
  the 
  hands 
  are 
  in 
  good 
  

   position 
  for 
  drawing, 
  and 
  the 
  other 
  illustrations 
  may 
  be 
  

   regarded 
  as 
  strictly 
  accurate. 
  I 
  give 
  the 
  following 
  additional 
  

   particulars. 
  The 
  setae 
  of 
  the 
  peduncles 
  of 
  the 
  antennules 
  

   and 
  antennae 
  stand 
  out 
  at 
  nearly 
  right 
  angles, 
  and 
  in 
  this 
  

   respect 
  remind 
  one 
  of 
  M. 
  tuberculatus. 
  The 
  first 
  peraeopods 
  

   (fig. 
  3) 
  are, 
  as 
  well 
  as 
  the 
  other 
  peraeopods, 
  very 
  sparingly 
  

   ciliated, 
  the 
  nail 
  very 
  long 
  and 
  acute, 
  as 
  long 
  as 
  the 
  propodos. 
  

   The 
  fourth 
  peraeopods 
  have 
  the 
  basos 
  ovate, 
  with 
  a 
  line 
  of 
  

   setae 
  down 
  the 
  distal 
  half 
  of 
  the 
  centre, 
  the 
  hinder 
  margin 
  with 
  

   cilia 
  at 
  regular 
  intervals 
  ; 
  the 
  meros 
  is 
  expanded 
  behind 
  at 
  its 
  

   termination, 
  and 
  is 
  there 
  twice 
  as 
  broad 
  as 
  the 
  portion 
  to 
  

   which 
  the 
  carpus 
  is 
  united. 
  Meros, 
  propodos, 
  and 
  dactylus 
  

   subequal 
  in 
  length, 
  carpus 
  about 
  one 
  third 
  shorter. 
  Last 
  

   peraeopods 
  having 
  the 
  basos 
  pyriform, 
  rather 
  longer 
  than 
  

   broad, 
  equally 
  produced 
  behind 
  and 
  before 
  ; 
  hinder 
  margin 
  

   obscurely 
  crenated, 
  with 
  small 
  cilia, 
  front 
  margin 
  bearing 
  

   minute 
  spinules 
  ; 
  meros 
  as 
  long 
  as 
  basos, 
  distal 
  posterior 
  

   angle 
  produced 
  downwards 
  into 
  a 
  lobe 
  which 
  is 
  equal 
  in 
  length 
  

   to 
  the 
  breadth 
  of 
  the 
  carpus. 
  Although 
  there 
  is 
  a 
  corre- 
  

   sponding 
  lobe 
  in 
  some 
  other 
  species 
  it 
  is 
  here 
  more 
  largely 
  

   developed 
  than 
  usual. 
  

  

  This 
  species 
  may 
  possibly 
  be 
  the 
  same 
  as 
  M. 
  tenuiroslratus, 
  

   Boeck, 
  but 
  I 
  am 
  unable 
  to 
  determine 
  with 
  certainty. 
  The 
  

   last 
  uropods 
  are 
  absent 
  in 
  my 
  specimen, 
  and 
  the 
  parts 
  which 
  

   seem 
  to 
  afford 
  good 
  characters 
  in 
  M. 
  cequicornis 
  are 
  not 
  so 
  

   described 
  by 
  Boeck 
  as 
  to 
  lead 
  with 
  any 
  degree 
  of 
  certainty 
  to 
  

   identification. 
  At 
  any 
  rate 
  the 
  name 
  here 
  employed, 
  M. 
  

   cequicornis, 
  antedates 
  by 
  two 
  years 
  that 
  of 
  M, 
  tenuirostratus 
  } 
  

   and 
  it 
  would 
  appear 
  to 
  differ 
  from 
  the 
  latter 
  form 
  markedly 
  

   in 
  the 
  characters 
  of 
  the 
  antennae 
  and 
  antennules, 
  the 
  less 
  pro- 
  

   duced 
  rostrum 
  (which, 
  though 
  bearing 
  the 
  same 
  relative 
  length 
  

   to 
  the 
  first 
  joint 
  of 
  antennules, 
  is 
  shorter, 
  since 
  that 
  joint 
  is 
  

   shorter), 
  the 
  more 
  expanded 
  meros 
  of 
  fourth 
  peraeopods, 
  and 
  

   other 
  points. 
  

  

  