﻿Siphonophora 
  of 
  the 
  Canary 
  Islands, 
  243 
  

  

  24. 
  Anthemodes 
  canarlensis, 
  Hack. 
  

  

  I 
  observed 
  a 
  young 
  specimen 
  with 
  six 
  nectocalyces 
  on 
  the 
  

   21st 
  of 
  January. 
  

  

  25. 
  Crystallodes 
  rig 
  id 
  urn. 
  Hack. 
  

  

  The 
  first 
  specimen 
  of 
  Crystallodes 
  occurred 
  on 
  January 
  12. 
  

   From 
  that 
  date 
  onwards 
  this 
  line 
  Physophorid 
  appeared 
  so 
  

   regularly 
  and 
  so 
  abundantly 
  that 
  it 
  decidedly 
  furnishes 
  one 
  of 
  

   the 
  most 
  characteristic 
  forms 
  of 
  the 
  Canaries. 
  Home 
  spe- 
  

   cimens 
  that 
  I 
  observed 
  were 
  in 
  part 
  considerably 
  larger 
  than 
  

   the 
  largest 
  described 
  by 
  Hackel. 
  Thus 
  I 
  not 
  unfrequently 
  

   captured 
  animals 
  of 
  75 
  millim. 
  in 
  length, 
  with 
  24 
  complete 
  

   nectocalyces 
  and 
  9 
  individual 
  groups. 
  To 
  complete 
  Hackel's 
  

   description, 
  I 
  may 
  add 
  that 
  the 
  larger 
  examples 
  presented 
  

   4-5 
  palps 
  on 
  each 
  individual 
  group, 
  and 
  that 
  the 
  male 
  sexual 
  

   racemes 
  are 
  placed 
  proximally, 
  the 
  female 
  ones 
  distally 
  A 
  

   further 
  remarkable 
  circumstance 
  is 
  that 
  the 
  perfectly 
  mature 
  

   male 
  and 
  female 
  gonophores 
  possess 
  a 
  well-developed 
  umbrella, 
  

   and 
  are 
  able 
  by 
  means 
  of 
  this 
  to 
  move 
  in 
  the 
  water 
  ; 
  more- 
  

   over, 
  in 
  the 
  perfectly 
  mature 
  sexual 
  medusse 
  the 
  manubrium 
  

   does 
  not 
  project 
  from 
  the 
  nectosac. 
  Among 
  the 
  rigid 
  bracts 
  

   only 
  those 
  which 
  are 
  direetly 
  inserted 
  upon 
  the 
  appendicular 
  

   groups 
  are 
  provided 
  with 
  a 
  long 
  vascular 
  canal 
  • 
  the 
  inter- 
  

   nodial 
  bracts, 
  on 
  the 
  contrary, 
  are 
  destitute 
  of 
  the 
  canal. 
  

   Sometimes 
  I 
  found 
  old 
  examples 
  of 
  Crystallodes 
  in 
  which 
  the 
  

   stem 
  was 
  of 
  a 
  sulphur-yellow 
  colour. 
  

  

  As 
  regards 
  the 
  post-embryonic 
  development 
  of 
  Crystallodes, 
  

   I 
  would 
  chiefly 
  call 
  attention 
  to 
  the 
  peculiarly 
  formed 
  larval 
  

   tentacles. 
  Hackel 
  is 
  of 
  opinion 
  that 
  the 
  cnidaria 
  of 
  the 
  pri- 
  

   mary 
  tentacle 
  are 
  directly 
  developed 
  into 
  the 
  definitive 
  cnidaria 
  

   furnished 
  with 
  a 
  terminal 
  vesicle 
  and 
  two 
  lateral 
  filaments. 
  

   I 
  was 
  also 
  the 
  more 
  inclined 
  to 
  this 
  view 
  because 
  the 
  larval 
  

   cnidaria 
  not 
  only 
  show 
  the 
  lateral 
  filaments 
  and 
  terminal 
  ve- 
  

   sicle 
  already 
  observed 
  by 
  Hackel, 
  but 
  also 
  present 
  a 
  mantle-like 
  

   involucrum, 
  such 
  as 
  is 
  actually 
  characteristic 
  of 
  the 
  definitive 
  

   cnidaria. 
  At 
  any 
  rate 
  the 
  cnidaria 
  formed 
  on 
  the 
  embryonal 
  

   tentacles 
  are 
  considerably 
  more 
  complicated 
  than 
  those 
  of 
  any 
  

   other 
  Physophorid*, 
  with 
  their 
  naked 
  reniform 
  batteries, 
  which 
  

   remind 
  us 
  of 
  the 
  Calycophoridae. 
  Nevertheless 
  they 
  are 
  not 
  

   developed 
  by 
  spiral 
  convolution 
  of 
  the 
  urticating 
  band 
  into 
  

   the 
  definitive 
  cnidaria, 
  but 
  they 
  represent 
  larval 
  structures, 
  

   followed 
  in 
  the 
  later 
  developed 
  groups 
  by 
  heteromorphous 
  

   structures. 
  Thus 
  I 
  repeatedly 
  observed 
  full-grown 
  old 
  

   examples 
  of 
  Crystallodes, 
  which 
  still 
  presented 
  the 
  well- 
  

  

  