﻿348 
  H. 
  J. 
  HANSEN. 
  

  

  ■would 
  be 
  rather 
  meagre^ 
  but 
  for 
  various 
  reasous 
  it 
  was 
  im- 
  

   possible 
  for 
  mc 
  to 
  work 
  out 
  the 
  whole 
  new 
  material 
  collected 
  

   since 
  1895. 
  Under 
  these 
  circumstances 
  I 
  resolved 
  to 
  embody 
  

   here 
  one 
  very 
  interesting 
  form, 
  secured 
  on 
  animals 
  from 
  New 
  

   Zealand, 
  and 
  extending 
  in 
  various 
  respects 
  our 
  knowledge 
  of 
  

   the 
  family. 
  " 
  The 
  Choniostomatida3, 
  a 
  family 
  of 
  Copepoda, 
  

   parasitic 
  on 
  Crustacea 
  Malacostraca" 
  is 
  the 
  complete 
  title 
  of 
  

   my 
  above-mentioned 
  book, 
  but 
  the 
  new 
  form 
  from 
  New 
  

   Zealand 
  of 
  the 
  same 
  family 
  lives 
  ou 
  a 
  species 
  of 
  Ostracoda, 
  

   an 
  order 
  of 
  Crustacea 
  Entomostraca. 
  Besides, 
  nobody 
  has 
  

   ever, 
  as 
  far 
  as 
  I 
  know, 
  found 
  any 
  Copepod 
  parasitic 
  on 
  any 
  

   species 
  of 
  Ostracoda, 
  while 
  on 
  three 
  forms 
  belonging 
  to 
  this 
  

   order 
  G. 
  O. 
  Sars 
  has 
  discovered 
  one^ 
  and 
  Th. 
  E. 
  R. 
  Stebbing 
  

   a 
  second, 
  and 
  G. 
  W. 
  Miiller 
  a 
  third 
  species 
  of 
  the 
  Cryptonis- 
  

   cinte 
  (a 
  sub-family 
  of 
  parasitic 
  Isopoda) 
  ; 
  the 
  two 
  first-named 
  

   authors 
  have 
  produced 
  full 
  description 
  of 
  the 
  parasites, 
  while 
  

   that 
  found 
  by 
  Miiller 
  was 
  left 
  un 
  described. 
  

  

  The 
  following 
  descriptions 
  of 
  the 
  two 
  forms 
  were 
  written 
  

   nearly 
  in 
  conformity 
  to 
  those 
  in 
  my 
  earlier 
  monograph. 
  

  

  Sphseronella 
  norvegica, 
  n. 
  sp. 
  

   PI. 
  22, 
  figs, 
  la— 
  1^. 
  

  

  Female. 
  — 
  The 
  specimen 
  drawn 
  (fig. 
  la) 
  and 
  dissected 
  

   measured 
  1*7 
  mm. 
  in 
  length, 
  and 
  nearly 
  the 
  same 
  in 
  breadth; 
  

   the 
  two 
  other 
  specimens 
  seen 
  are 
  almost 
  similar 
  in 
  size. 
  The 
  

   head 
  is 
  proportionately 
  very 
  small 
  and 
  well-defined 
  from 
  the 
  

   trunk. 
  

  

  The 
  frontal 
  margin 
  (fig. 
  1 
  d) 
  is 
  well 
  developed, 
  adorned 
  with 
  

   a 
  row 
  of 
  very 
  short 
  hairs, 
  but 
  the 
  most 
  lateral 
  portion 
  of 
  the 
  

   margin, 
  towards 
  the 
  base 
  of 
  the 
  antennulse, 
  is 
  naked. 
  The 
  

   antennulse 
  (a) 
  are 
  long, 
  three-jointed, 
  with 
  the 
  terminal 
  setge 
  

   very 
  long 
  ; 
  the 
  third 
  joint 
  has, 
  a 
  little 
  before 
  the 
  middle, 
  an 
  

   olfactory 
  seta 
  (.s), 
  which 
  is 
  a 
  little 
  shorter 
  than 
  the 
  terminal 
  

   ones. 
  The 
  antennas 
  (b) 
  are 
  of 
  moderate 
  length, 
  three-jointed; 
  

   the 
  joints 
  decreasing 
  strongly 
  in 
  length 
  from 
  the 
  first 
  to 
  the 
  

  

  