﻿Miscellaneous. 
  513 
  

  

  With 
  the 
  object 
  of 
  verifying 
  the 
  hypothesis 
  formerly 
  put 
  forward 
  

   by 
  us 
  with 
  respect 
  to 
  the 
  relationship 
  of 
  the 
  Cryptoniseians 
  and 
  

   Dajidse, 
  we 
  have 
  made 
  an 
  appeal 
  to 
  those 
  zoologists 
  who 
  possessed 
  

   specimens 
  of 
  these 
  exceedingly 
  rare 
  Crustaceans. 
  The 
  Rev. 
  A. 
  M. 
  

   Norman 
  has 
  kindly 
  given 
  us 
  a 
  specimen 
  of 
  Dajus 
  mysidis, 
  Kroyer, 
  

   and 
  lent 
  us 
  one 
  of 
  an 
  Aspidophryxus 
  *. 
  We 
  may 
  notice 
  here 
  a 
  

   most 
  unexpected 
  etiological 
  fact 
  — 
  the 
  existence 
  of 
  a 
  Copepod 
  para- 
  

   sitic 
  on 
  the 
  latter. 
  By 
  a 
  fortunate 
  chance 
  the 
  specimen 
  of 
  Aspido- 
  

   phryxus 
  communicated 
  by 
  Norman, 
  which 
  is 
  attached 
  to 
  the 
  back 
  

   of 
  an 
  Erythrops 
  micropJiihalma, 
  G. 
  0. 
  Sars, 
  sheltered 
  beneath 
  the 
  

   posterior 
  part 
  of 
  its 
  slightly 
  raised 
  dorsal 
  shield 
  the 
  female 
  and 
  two 
  

   males 
  of 
  a 
  very 
  singular 
  Copepod, 
  which 
  we 
  shall 
  name 
  Aspidoecia 
  

   Normani. 
  

  

  The 
  female 
  presents 
  the 
  form 
  of 
  a 
  sac 
  resembling 
  a 
  miniature 
  

   Saccidina 
  ; 
  in 
  its 
  greatest 
  diameter 
  (transverse) 
  it 
  measures 
  eight 
  

   tenths 
  of 
  a 
  millimetre. 
  The 
  colour 
  in 
  alcohol 
  is 
  rosy. 
  The 
  animal 
  

   is 
  attached 
  on 
  the 
  one 
  hand 
  to 
  the 
  My 
  sis 
  by 
  a 
  short 
  peduncle 
  ter- 
  

   minated 
  by 
  a 
  sucking-disk, 
  on 
  the 
  other 
  to 
  the 
  Aspidophryxus 
  by 
  an 
  

   elongated 
  cord 
  (broken 
  in 
  our 
  specimen) 
  starting 
  from 
  the 
  sucking- 
  

   disk 
  and 
  inserted 
  into 
  the 
  middle 
  of 
  the 
  ventral 
  surface 
  of 
  the 
  pleon 
  

   of 
  the 
  Epicaridan. 
  Hooked 
  on 
  to 
  this 
  cord 
  was 
  the 
  male 
  Aspido- 
  

   phryxus, 
  it 
  being 
  rendered 
  impossible 
  for 
  him 
  to 
  shelter 
  himself 
  as 
  

   usual 
  beneath 
  the 
  pleon 
  of 
  his 
  female. 
  Towards 
  the 
  free 
  extremity 
  

   of 
  the 
  body 
  of 
  the 
  Aspidoecia 
  two 
  chitinous 
  eminences 
  are 
  observed 
  ; 
  

   then, 
  on 
  the 
  side 
  opposite 
  to 
  the 
  sucking- 
  disk, 
  the 
  two 
  genital 
  aper- 
  

   tures, 
  to 
  which 
  are 
  appended 
  Jive 
  packets 
  of 
  ova. 
  Each 
  of 
  these 
  

   ovigerous 
  sacs, 
  which 
  are 
  nearly 
  spherical 
  in 
  form 
  and 
  measure 
  

   three 
  tenths 
  of 
  a 
  millimetre 
  in 
  diameter, 
  contained 
  eight 
  or 
  ten 
  ova 
  

   in 
  segmentation. 
  

  

  In 
  one 
  of 
  the 
  sacs 
  the 
  ova 
  were 
  all 
  very 
  distinctly 
  in 
  the 
  stage 
  4. 
  

   The 
  whole 
  interior 
  of 
  the 
  body 
  of 
  the 
  female 
  is 
  filled 
  with 
  enormous 
  

   ovaries 
  containing 
  well-developed 
  ovules. 
  We 
  also 
  observe, 
  in 
  the 
  

   vicinity 
  of 
  the 
  sucking-disk, 
  two 
  chitinogenous 
  glands, 
  which 
  assist, 
  

   no 
  doubt, 
  in 
  the 
  fixation 
  of 
  the 
  parasite. 
  

  

  One 
  of 
  the 
  males 
  was 
  attached 
  to 
  the 
  Mysis 
  at 
  some 
  distance 
  

   from 
  the 
  female, 
  the 
  other 
  upon 
  the 
  female 
  herself. 
  These 
  males 
  

   are 
  about 
  150 
  fx 
  in 
  length. 
  Their 
  general 
  form 
  is 
  very 
  analogous 
  to 
  

   that 
  of 
  the 
  males 
  of 
  Spjharonella 
  LeueTcarti, 
  Sal. 
  In 
  the 
  anterior 
  

   part 
  the 
  cement-glands 
  secrete 
  a 
  spiral 
  chitinous 
  filament, 
  which 
  

   serves 
  for 
  the 
  fixation 
  of 
  the 
  animal. 
  The 
  presence 
  of 
  several 
  fila- 
  

   ments 
  upon 
  the 
  integument 
  of 
  the 
  female 
  indicates 
  either 
  that 
  the 
  

   males 
  move 
  about 
  or 
  that 
  they 
  had 
  been 
  more 
  numerous. 
  Beneath 
  

   tbe 
  organ 
  of 
  adherence 
  a 
  broad 
  sucking-disk 
  enables 
  the 
  animal 
  to 
  

   apply 
  its 
  buccal 
  parts 
  to 
  the 
  host 
  which 
  supports 
  it. 
  As 
  appen- 
  

   dages, 
  we 
  find 
  outside 
  the 
  mouth 
  a 
  pair 
  of 
  antennaj, 
  a 
  first 
  pair 
  of 
  

  

  * 
  This 
  specimen 
  was 
  named 
  A. 
  peltatus, 
  G. 
  O. 
  Sars, 
  but 
  the 
  authors 
  

   regard 
  it 
  as 
  belonging 
  to 
  a 
  new 
  species 
  which 
  they 
  propose 
  to 
  name 
  A. 
  

   Sarsi. 
  

  

  