﻿Siphonophora 
  of 
  the 
  Canary 
  Islands. 
  239 
  

  

  II. 
  DrPHYIDJE. 
  

  

  7. 
  Dipbyes 
  subtilis, 
  Chun 
  Ersaea 
  elongata, 
  Will, 
  Chun, 
  I88G. 
  

  

  8. 
  tripartita, 
  Costa 
  Eudoxia 
  messaneusis, 
  Geaenb, 
  I 
  r 
  i 
  . 
  -, 
  -,-n 
  

  

  1 
  campanula, 
  Leach. 
  * 
  \ 
  Leuckart, 
  18o3. 
  

  

  9. 
  serrata, 
  sp. 
  n 
  serrata, 
  Chun, 
  1888. 
  

  

  10. 
  Diphyopsis 
  campanulifera, 
  Q. 
  SfG. 
  Lessouii, 
  Eseh., 
  Huxl., 
  Chun, 
  1888. 
  

  

  11. 
  Abyla 
  trigona, 
  Q. 
  <§• 
  G 
  Amphirrhoa 
  alata, 
  Les. 
  I 
  Huxley, 
  1858. 
  

  

  Eudoxia 
  trigona, 
  Gegenb. 
  \ 
  Gegenbaur, 
  1800. 
  

  

  12. 
  Bassia 
  perforata, 
  Q. 
  Sf 
  G 
  Spbenoides 
  australis, 
  Huxl., 
  Chun, 
  1888 
  (sur- 
  

  

  mised 
  by 
  Huxley, 
  1858). 
  

  

  13. 
  Abylopsis 
  quincunx, 
  Chun 
  .... 
  Aglaismoides 
  Escbscboltzii, 
  Huxl., 
  Chun, 
  1833. 
  

  

  14. 
  p 
  , 
  Ceratocymba 
  spectabilis, 
  Chun. 
  

  

  III. 
  Amphicaryonid^e. 
  

  

  15. 
  Ampbicaryon 
  acaule, 
  sp. 
  n 
  Diplodoxia 
  acaulis, 
  Chun, 
  1888. 
  

  

  Order 
  IL 
  PHYSOPHORID.E, 
  Esch. 
  

  

  I 
  liave 
  repeatedly 
  endeavoured 
  to 
  show 
  that 
  the 
  organism 
  

   of 
  the 
  Physophoridae 
  displays 
  manifold 
  relations 
  to 
  that 
  of 
  

   the 
  Calycopkoridae, 
  which 
  justify 
  the 
  conclusion 
  that 
  the 
  two 
  

   orders 
  have 
  a 
  common 
  origin. 
  In 
  this 
  respect 
  I 
  would 
  adduce 
  

   in 
  the 
  first 
  line 
  the 
  demonstration 
  which 
  I 
  have 
  furnished, 
  

   that 
  in 
  the 
  embryo 
  of 
  boih 
  orders 
  a 
  heteromorphous 
  rudimen- 
  

   tary 
  nectocalyx 
  is 
  formed, 
  which 
  in 
  the 
  Calycophoridaj 
  is 
  

   thrown 
  off 
  (perhaps 
  it 
  persists 
  in 
  the 
  Sphau-onectidfe), 
  whilst 
  

   in 
  the 
  Physophoridae 
  it 
  becomes 
  converted 
  into 
  the 
  pneuma- 
  

   tophore. 
  If 
  I 
  now 
  mention 
  further 
  that 
  in 
  the 
  mere 
  highly 
  

   organized 
  Calycophoridse 
  the 
  nectocalyces 
  occur 
  of 
  the 
  same 
  

   form 
  in 
  considerable 
  numbers, 
  that, 
  further, 
  the 
  close 
  concen- 
  

   tration 
  of 
  the 
  buds 
  into 
  Eudoxia-groups 
  is 
  given 
  up, 
  and 
  that 
  

   I 
  am 
  able 
  to 
  cite 
  species 
  in 
  which 
  the 
  stem 
  is 
  transformed, 
  as 
  

   in 
  many 
  Physophoridre, 
  into 
  a 
  gemmiparous 
  disk, 
  we 
  obtain 
  

   a 
  whole 
  series 
  of 
  noteworthy 
  relations 
  which 
  seem 
  to 
  indicate 
  

   that 
  I 
  he 
  Physophoridae 
  took 
  their 
  origin, 
  if 
  not 
  from 
  Stepha- 
  

   nophyidse 
  or 
  Polyphyidae, 
  certainly 
  from 
  a 
  root 
  common 
  to 
  

   the 
  two 
  orders. 
  To 
  this 
  may 
  be 
  added 
  finally 
  as 
  an 
  impor- 
  

   tant 
  argument 
  that, 
  by 
  the 
  discovery 
  of 
  the 
  remarkable 
  

   Stephanophyes 
  with 
  its 
  heteromorphous 
  tentacles, 
  a 
  condition 
  

   is 
  shadowed 
  forth 
  which 
  has 
  hitherto 
  been 
  regarded 
  as 
  an 
  

   exclusive 
  characteristic 
  of 
  the 
  Physophoridae. 
  

  

  In 
  accordance 
  with 
  my 
  previous 
  statements 
  I 
  divide 
  the 
  

   Physophoridae 
  into 
  the 
  two 
  suborders 
  Haplophysae 
  and 
  Tra- 
  

   cheophysae. 
  

  

  17 
  

  

  