﻿234 
  Prof. 
  Carl 
  Chun 
  on 
  the 
  

  

  visible 
  even 
  to 
  the 
  naked 
  eye. 
  The 
  polypi 
  te 
  and 
  tentacles 
  

   show 
  the 
  ordinary 
  structure 
  ; 
  the 
  long 
  orange-coloured 
  

   batteries 
  are 
  provided 
  with 
  a 
  particularly 
  strong 
  elastic 
  band 
  

   twisted 
  like 
  a 
  rope. 
  

  

  The 
  gono-nectocalyces 
  are 
  always 
  two 
  in 
  number, 
  and, 
  in- 
  

   deed, 
  one 
  is 
  male 
  and 
  the 
  other 
  female 
  in 
  development, 
  a 
  con- 
  

   dition 
  which 
  I 
  have 
  already 
  noted 
  as 
  characteristic 
  of 
  the 
  

   Eudoxise 
  of 
  the 
  Abylidse. 
  The 
  manubrium, 
  which 
  is 
  occu- 
  

   pied 
  by 
  the 
  sexual 
  products, 
  is 
  remarkably 
  small 
  in 
  propor- 
  

   tion 
  to 
  the 
  enormously 
  large 
  calyces. 
  The 
  latter 
  measure 
  

   nearly 
  2 
  centim. 
  ; 
  the 
  length 
  of 
  the 
  subumbrellar 
  cavity 
  in 
  

   the 
  larger 
  calyx 
  amounts 
  to 
  13 
  millim. 
  Their 
  four 
  edges 
  are 
  

   produced 
  in 
  a 
  wing-like 
  form 
  and 
  run 
  out 
  at 
  the 
  margin 
  of 
  

   the 
  umbrella 
  into 
  tooth-like 
  angles, 
  one 
  of 
  which 
  is 
  deve- 
  

   loped 
  to 
  a 
  considerable 
  length. 
  I 
  could 
  always 
  observe 
  two 
  

   or 
  three 
  reserve-gonocalyces 
  in 
  different 
  stages 
  of 
  develop- 
  

   ment. 
  Their 
  size 
  alternates 
  quite 
  regularly, 
  so 
  that, 
  if 
  the 
  

   largest 
  calyx 
  of 
  the 
  Eudoxia 
  is 
  male, 
  the 
  somewhat 
  smaller 
  

   one 
  which 
  appears 
  at 
  the 
  same 
  time 
  is 
  female; 
  upon 
  this 
  

   follows 
  a 
  male 
  reserve-calyx, 
  and 
  then 
  again 
  a 
  small 
  bud, 
  

   which, 
  however, 
  already 
  shows 
  the 
  rudiments 
  of 
  the 
  ova 
  in 
  

   the 
  manubrium. 
  

  

  Ceratocymba 
  spectabilis 
  occurred 
  rarely 
  and 
  singly 
  from 
  

   January 
  to 
  March. 
  The 
  bract 
  behaves 
  very 
  remarkably 
  

   under 
  strong 
  contact, 
  inasmuch 
  as 
  upon 
  irritation 
  a 
  whitish 
  

   turbidity 
  makes 
  its 
  appearance, 
  first 
  in 
  the 
  neighbourhood 
  of 
  

   the 
  two 
  horn-like 
  canals 
  of 
  the 
  oil-receptacle, 
  and 
  afterwards, 
  

   commencing 
  from 
  the 
  angles, 
  also 
  in 
  the 
  whole 
  of 
  the 
  gelati- 
  

   nous 
  mass. 
  This 
  is 
  due 
  to 
  the 
  appearance 
  of 
  extremely 
  fine 
  

   granules, 
  which 
  again 
  disappear 
  (in 
  about 
  half 
  an 
  hour) 
  if 
  

   the 
  Eudoxia 
  is 
  left 
  in 
  repose. 
  The 
  peculiar 
  turbidity 
  reminds 
  

   one 
  of 
  an 
  analogous 
  phenomenon 
  in 
  Hippopodius, 
  only 
  that 
  

   there 
  the 
  milky 
  coloration 
  consequent 
  upon 
  irritation 
  and 
  

   afterwards 
  disappearing 
  is 
  connected 
  with 
  the 
  ectodermal 
  

   cells 
  of 
  the 
  nectocalyces. 
  In 
  a 
  certain 
  sense 
  even 
  the 
  struc- 
  

   tureless 
  jelly 
  of 
  the 
  bract 
  must 
  be 
  accessible 
  to 
  an 
  irritation, 
  

   as 
  the 
  gradual 
  manifestation 
  and 
  equally 
  gradual 
  disappear- 
  

   ance 
  of 
  a 
  tolerably 
  intense 
  turbidity 
  proves. 
  

  

  It 
  is 
  evident 
  that 
  a 
  Eudoxia 
  from 
  the 
  Straits 
  of 
  Gibraltar 
  

   described 
  by 
  Quoy 
  and 
  Gaimard* 
  as 
  Cymba 
  satjtttata 
  is 
  allied 
  

   to 
  the 
  Ceratocymba 
  here 
  described. 
  At 
  any 
  rate 
  the 
  genus 
  

   Ctj?7iba 
  represents 
  a 
  Eudoxia 
  and 
  not 
  a 
  Monophyid, 
  in 
  which 
  

   latter 
  sense 
  the 
  generic 
  name 
  is 
  adopted 
  by 
  Hackel. 
  As, 
  

   moreover, 
  the 
  name 
  Cymba 
  was 
  employed 
  for 
  a 
  mollusk 
  as 
  

   early 
  as 
  1826, 
  it 
  must 
  be 
  withdrawn 
  here. 
  

  

  # 
  Ami. 
  Sci. 
  Nat 
  vol. 
  x. 
  (1827), 
  p. 
  16, 
  pi. 
  ii.c. 
  figs. 
  1-9. 
  

  

  