﻿352 
  H. 
  J. 
  HANSEN. 
  

  

  the 
  second 
  pair 
  with 
  two 
  nearly 
  similar 
  seta), 
  but 
  its 
  long- 
  

   seta 
  is 
  scarcely 
  as 
  long 
  as 
  that 
  on 
  the 
  first 
  pair 
  of 
  legs. 
  The 
  

   caudal 
  stylets 
  (d) 
  are 
  rather 
  similar 
  to 
  the 
  second 
  pair 
  of 
  

   legs, 
  each 
  terminating 
  in 
  two 
  or 
  three 
  seta;, 
  the 
  longest 
  of 
  

   which 
  is 
  a 
  little 
  shorter 
  than 
  the 
  corresponding 
  one 
  of 
  the 
  

   legs, 
  while 
  the 
  other 
  set^ 
  are 
  more 
  than 
  half 
  as 
  long 
  as 
  the 
  

   long 
  seta. 
  

  

  Ovisacs. 
  — 
  The 
  ovisacs 
  belonging 
  to 
  two 
  females 
  differed 
  

   little 
  in 
  size, 
  while 
  those 
  of 
  a 
  third 
  female 
  differed 
  consider- 
  

   ably 
  from 
  each 
  other, 
  but 
  that 
  was 
  to 
  a 
  certain 
  degree 
  due 
  to 
  

   the 
  different 
  stage 
  of 
  development 
  of 
  their 
  contents. 
  The 
  

   two 
  ovisacs 
  figured 
  (fig. 
  1 
  c) 
  give 
  the 
  average 
  size 
  of 
  them 
  as 
  

   compared 
  with 
  the 
  female 
  (fig. 
  la) 
  and 
  the 
  male 
  (fig. 
  16), 
  

   all 
  being 
  drawn 
  with 
  the 
  same 
  degree 
  of 
  enlargement; 
  the 
  

   large 
  one 
  of 
  these 
  ovisacs 
  measures 
  nearly 
  "7 
  mm. 
  in 
  diameter. 
  

   The 
  ovisacs 
  are 
  generally 
  subglobular, 
  sometimes 
  irregularly 
  

   flattened 
  from 
  pressure 
  ; 
  each 
  contains 
  a 
  rather 
  high 
  number 
  

   of 
  eggs. 
  

  

  Larva 
  and 
  Post-larval 
  Development. 
  — 
  Unknown. 
  

  

  Habitat. 
  — 
  Among 
  several 
  specimens 
  of 
  Rhachotropis 
  

   leucophthalm 
  us, 
  G. 
  0. 
  Sars, 
  secured 
  by 
  Canon 
  A. 
  M. 
  

   Norman 
  in 
  Throndhjemsfjord 
  (Norway) 
  from 
  a 
  depth 
  of 
  250 
  

   — 
  300 
  fathoms, 
  I 
  found 
  two 
  adult 
  females 
  with 
  this 
  parasite. 
  

   In 
  one 
  marsupium 
  I 
  found 
  one 
  female, 
  one 
  male 
  and 
  twelve 
  

   ovisacs, 
  the 
  latter 
  ones 
  all 
  adhering 
  to 
  each 
  other; 
  in 
  the 
  

   other 
  marsupium 
  was 
  one 
  female 
  with 
  six 
  free 
  ovisacs. 
  The 
  

   single 
  male 
  was 
  very 
  dirty, 
  and, 
  hoping 
  to 
  get 
  some 
  fine 
  

   specimens, 
  I 
  applied 
  myself 
  to 
  Prof. 
  Gr. 
  O. 
  Sars, 
  who, 
  with 
  

   his 
  usual 
  courtesy, 
  lent 
  me 
  his 
  Avhole 
  material 
  of 
  that 
  rare 
  

   Amphipod 
  for 
  inspection. 
  I 
  found 
  only 
  one 
  infested 
  speci- 
  

   men, 
  with 
  one 
  female, 
  eight 
  free 
  ovisacs, 
  but 
  no 
  male. 
  (I 
  

   succeeded 
  afterwards 
  in 
  cleaning 
  the 
  male 
  rather 
  well 
  with 
  

   two 
  brushes, 
  each 
  consisting 
  of 
  one 
  short 
  and 
  fine 
  hair 
  fixed 
  

   in 
  a 
  small 
  stick). 
  

  

  Remarks. 
  — 
  The 
  male 
  is 
  large 
  in 
  proportion 
  to 
  the 
  same 
  

   sex 
  in 
  most 
  other 
  species 
  of 
  Sphserouella, 
  and 
  it 
  is 
  much 
  

   larger 
  than 
  one 
  of 
  the 
  eggs 
  ; 
  by 
  the 
  shape 
  of 
  the 
  legs 
  and 
  

  

  