﻿from 
  the 
  North 
  Sea 
  and 
  adjacent 
  parts. 
  273 
  

  

  probosci^=, 
  but 
  the 
  filiform 
  pjipillse 
  at 
  the 
  aperture 
  were 
  not 
  

   present. 
  The 
  orgnn 
  is 
  well 
  ada})ted 
  for 
  the 
  predatory 
  habits 
  

   o£ 
  the 
  animal^ 
  and 
  Dr. 
  Johnston 
  found 
  that 
  they 
  devoured 
  

   one 
  another 
  in 
  confinement. 
  

  

  The 
  Monograph 
  mentions 
  tliat 
  Dr. 
  Johnston 
  considered 
  

   the 
  purplish 
  liue, 
  which 
  is 
  often 
  seen 
  in 
  many 
  specimens, 
  

   spread 
  rapidly 
  all 
  over 
  the 
  body 
  when 
  the 
  animal 
  is 
  alarmed. 
  

   However, 
  it 
  is 
  further 
  stated 
  that, 
  as 
  this 
  phenomenon 
  

   occurred 
  in 
  April, 
  it 
  is 
  possible 
  that 
  it 
  may 
  have 
  been 
  con- 
  

   nected 
  with 
  the 
  development 
  of 
  the 
  ova. 
  Sir 
  J. 
  Dalyell, 
  in 
  

   his 
  exj)eriments, 
  found 
  that 
  the 
  colour 
  depended 
  on 
  the 
  food. 
  

  

  Genus 
  Megalia, 
  Marion 
  & 
  Bobretsky, 
  1875. 
  

  

  Megalia 
  assimilis, 
  sp. 
  n. 
  

  

  One 
  fragment 
  of 
  this 
  annelid, 
  consisting 
  of 
  the 
  head 
  and 
  

   seventeen 
  segments, 
  was 
  taken 
  in 
  dredge 
  104 
  at 
  the 
  depth 
  of 
  

   75 
  m. 
  at 
  Station 
  41 
  B, 
  lat. 
  56° 
  42' 
  N., 
  long. 
  0° 
  35' 
  E. 
  In 
  

   the 
  Monograph 
  an 
  allied 
  species, 
  M. 
  perarmata 
  (Marion 
  & 
  

   Bobretsky), 
  is 
  not 
  uncommon 
  in 
  dredgings 
  from 
  Queens's 
  

   Ground, 
  Asia 
  Shore, 
  and 
  Milbay 
  Channel, 
  Plymouth. 
  

   Marion 
  and 
  Bobretsky 
  found 
  it 
  under 
  stones 
  and 
  in 
  prairies 
  

   of 
  Posidonia, 
  and 
  in 
  the 
  coralline 
  region, 
  Marseilles. 
  

  

  Head 
  somewhat 
  quadrangular, 
  with 
  four 
  eyes 
  of 
  consider- 
  

   able 
  size, 
  the 
  anterior 
  pair 
  being 
  the 
  larger 
  and 
  placed 
  some- 
  

   what 
  widely 
  apart. 
  The 
  pairs 
  are 
  situated 
  near 
  eacii 
  other 
  

   towards 
  the 
  middle 
  region. 
  In 
  M. 
  perarmata^ 
  according 
  to 
  

   Marion 
  and 
  Bobretsky 
  *, 
  the 
  anterior 
  pair 
  have 
  lenses, 
  but 
  

   ill 
  this 
  species 
  there 
  is 
  some 
  uncertainty. 
  The 
  tentacles 
  are 
  

   long 
  and 
  smooth, 
  curved 
  in 
  this 
  specimen, 
  and 
  are 
  attached 
  

   over 
  the 
  palps, 
  which 
  are 
  smooth, 
  stout, 
  and 
  biarticulate. 
  

   The 
  buccal 
  region 
  lies 
  beneath 
  the 
  head. 
  Six 
  pairs 
  of 
  articu- 
  

   lated 
  tentacular 
  cirri, 
  most 
  of 
  which 
  in 
  this 
  specimen 
  have 
  

   been 
  broken, 
  are 
  directed 
  forward, 
  and 
  each 
  has 
  a 
  spine 
  at 
  

   its 
  base. 
  

  

  Body 
  about 
  5 
  mm. 
  in 
  length 
  (7-8 
  mm. 
  in 
  M. 
  perarmata) 
  , 
  

   and 
  tapers 
  posteriorly. 
  The 
  anal 
  segment 
  is 
  absent. 
  The 
  

   colour 
  is 
  yellow, 
  but 
  brown 
  spots 
  are 
  prominent 
  at 
  the 
  base 
  

   of 
  each 
  dorsal 
  cirrus 
  and 
  brown 
  patclies 
  appear 
  on 
  the 
  head. 
  

   Transverse 
  striations 
  occur 
  on 
  the 
  dorsal 
  surface 
  at 
  the 
  bases 
  

   of 
  the 
  feet, 
  up 
  several 
  of 
  which 
  the 
  stria3 
  are 
  continued. 
  Tlie 
  

   ventral 
  surface 
  is 
  lighter 
  in 
  hue, 
  and 
  on 
  it 
  also 
  are 
  minutely 
  

   transverse 
  and 
  somewhat 
  irregular 
  striae. 
  The 
  Monogra[)h 
  

   (vol. 
  ii. 
  jjart 
  i. 
  p. 
  137) 
  states 
  in 
  reference 
  to 
  M. 
  perarmata 
  : 
  

  

  * 
  Tide 
  ' 
  Annales 
  des 
  Sciences 
  Naturelles,' 
  ser, 
  vi. 
  vol. 
  ii. 
  pi. 
  vii. 
  fia. 
  IG. 
  

  

  