﻿Siphonophora 
  of 
  the 
  Canary 
  Islands. 
  215 
  

  

  by 
  Hackel, 
  a 
  considerable 
  number 
  of 
  new 
  species, 
  some 
  of 
  

   which 
  are 
  not 
  without 
  interest, 
  partly 
  on 
  account 
  of 
  their 
  

   peculiarity 
  of 
  structure, 
  partly 
  because 
  they 
  represent 
  inter- 
  

   mediate 
  forms 
  uniting 
  groups 
  hitherto 
  apparently 
  isolated. 
  

  

  During 
  the 
  autumn 
  months 
  up 
  to 
  the 
  beginning 
  of 
  January 
  

   the 
  pelagic 
  fauna, 
  especially 
  in 
  Siphonophora, 
  was 
  remarkably 
  

   poor. 
  Nevertheless 
  the 
  numerous 
  Eudoxiee 
  and 
  the 
  young- 
  

   stages 
  of 
  Physophoridaj 
  furnished 
  me 
  with 
  abundant 
  material 
  

   for 
  work, 
  which 
  enabled 
  me 
  to 
  ascertain 
  the 
  Eudoxise 
  

   belonging 
  to 
  all 
  the 
  observed 
  CalycophoridaB 
  and 
  to 
  advance 
  

   the 
  knowledge 
  of 
  the 
  postembryonal 
  development 
  of 
  the 
  

   Physophoridre. 
  It 
  was 
  only 
  from 
  January 
  onwards 
  that 
  the 
  

   adult 
  Physophoridaa 
  appeared, 
  and 
  with 
  them 
  magnificent 
  

   new 
  Calycophoridas, 
  which 
  exceeded 
  in 
  beauty 
  and 
  delicacy 
  

   all 
  the 
  forms 
  known 
  to 
  me. 
  

  

  Although 
  it 
  does 
  not 
  seem 
  to 
  me 
  advisable 
  to 
  discuss 
  the 
  

   theories 
  as 
  to 
  the 
  organization 
  of 
  the 
  Siphonophora 
  within 
  

   the 
  limits 
  of 
  a 
  brief 
  report, 
  I 
  am 
  led, 
  with 
  reference 
  to 
  the 
  

   principles 
  which 
  guided 
  me 
  in 
  the 
  establishment 
  of 
  the 
  system 
  

   of 
  the 
  Siphonophora, 
  to 
  enter 
  upon 
  certain 
  views 
  which 
  

   Hackel 
  has 
  put 
  forward 
  in 
  his 
  lately 
  published 
  " 
  System 
  der 
  

   Siphonophoren 
  auf 
  phylogenetischer 
  Grundlage 
  "* 
  ; 
  especially 
  

   so 
  far 
  as 
  they 
  are 
  in 
  opposition 
  to 
  the 
  opinions 
  maintained 
  

   by 
  me. 
  

  

  In 
  the 
  primary 
  larva 
  of 
  the 
  Siphonophora 
  Hackel 
  sees 
  a 
  

   simple 
  Medusan 
  persona, 
  which 
  occurs 
  in 
  the 
  form 
  of 
  a 
  

   Siphonula 
  and 
  a 
  Disconula. 
  The 
  latter 
  is 
  octoradiate 
  in 
  struc- 
  

   ture 
  and 
  becomes 
  subsequently 
  developed 
  into 
  the 
  Porpitce 
  

   and 
  Velelke; 
  while 
  the 
  bilaterally 
  symmetrical 
  Siphonula 
  

   furnishes 
  the 
  starting-point 
  for 
  all 
  the 
  other 
  Siphonophora. 
  

   In 
  accordance 
  with 
  this 
  Hackel 
  divides 
  the 
  Siphonophora 
  

   into 
  two 
  legions, 
  the 
  Disconantha3 
  and 
  the 
  Siphonanthaj. 
  

  

  In 
  the 
  first 
  place 
  as 
  regards 
  the 
  division 
  of 
  the 
  Siphono- 
  

   phora 
  into 
  two 
  subclasses, 
  of 
  which 
  the 
  one 
  includes 
  the 
  

   Velellce 
  and 
  Porpitce 
  hitherto 
  characterized 
  as 
  Chondropho- 
  

   ridse 
  or 
  Velellida3, 
  and 
  the 
  other 
  the 
  whole 
  of 
  the 
  Calyco- 
  

   phoridae 
  and 
  most 
  of 
  the 
  Physophoridse, 
  I 
  must 
  maintain 
  

  

  cunistances 
  under 
  which 
  the 
  journey 
  was 
  undertaken 
  by 
  the 
  aid 
  of 
  the 
  

   Academy 
  of 
  Sciences. 
  

  

  The 
  author 
  says 
  : 
  — 
  " 
  As 
  I 
  expected 
  that 
  the 
  persistent 
  north-east 
  trade- 
  

   wind 
  would 
  bring 
  me 
  material 
  in 
  abundance, 
  I 
  resolved 
  to 
  take 
  up 
  my 
  

   abode 
  on 
  the 
  north 
  coast 
  of 
  one 
  of 
  the 
  islands, 
  and 
  finally 
  selected 
  for 
  

   this 
  purpose 
  the 
  Puerto 
  de 
  la 
  Orotava, 
  where 
  I 
  found 
  accommodation 
  

   thoroughly 
  suited 
  to 
  my 
  purposes 
  in 
  the 
  Fonda 
  de 
  la 
  Marina, 
  situated 
  

   immediately 
  upon 
  the 
  harbour, 
  and 
  also, 
  after 
  the 
  inevitable 
  first 
  diffi- 
  

   culties, 
  suitable 
  boats 
  and 
  fishermen." 
  

  

  * 
  ' 
  Jenaische 
  Zeitschrift,' 
  lid. 
  xxii. 
  (1688). 
  

  

  